472 lines
21 KiB
Scala
472 lines
21 KiB
Scala
package lib
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import chisel3._
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import chisel3.util._
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trait Config {
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val TAG = 1
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}
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class axi4_to_ahb_IO extends Bundle with Config {
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val scan_mode = Input(Bool())
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val bus_clk_en = Input(Bool())
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val clk_override = Input(Bool())
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val axi_awvalid = Input(Bool())
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val axi_awid = Input(UInt(TAG.W)) // [TAG-1:0]
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val axi_awaddr = Input(UInt(32.W)) // [31:0]
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val axi_awsize = Input(UInt(3.W)) // [2:0]
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val axi_awprot = Input(UInt(3.W)) // [2:0]
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val axi_wvalid = Input(Bool())
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val axi_wdata = Input(UInt(64.W)) // [63:0]
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val axi_wstrb = Input(UInt(8.W)) // [7:0]
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val axi_wlast = Input(Bool())
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val axi_bready = Input(Bool())
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val axi_arvalid = Input(Bool())
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val axi_arid = Input(UInt(TAG.W)) // [TAG-1:0]
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val axi_araddr = Input(UInt(32.W)) // [31:0]
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val axi_arsize = Input(UInt(3.W)) // [2:0]
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val axi_arprot = Input(UInt(3.W)) // [2:0]
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val axi_rready = Input(Bool())
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val ahb_hrdata = Input(UInt(64.W)) // [63:0] // ahb bus read data
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val ahb_hready = Input(Bool()) // slave ready to accept transaction
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val ahb_hresp = Input(Bool()) // slave response (high indicates erro)
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//----------------------------outputs---------------------------
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val axi_awready = Output(Bool())
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val axi_wready = Output(Bool())
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val axi_bvalid = Output(Bool())
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val axi_bresp = Output(UInt(2.W)) // [1:0]]
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val axi_bid = Output(UInt(TAG.W)) // [TAG-1:0]
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// AXI Read Channels
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val axi_arready = Output(Bool())
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val axi_rvalid = Output(Bool())
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val axi_rid = Output(UInt(TAG.W)) // [TAG-1:0]
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val axi_rdata = Output(UInt(64.W)) // [63:0]
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val axi_rresp = Output(UInt(2.W)) // 1:0]
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val axi_rlast = Output(Bool())
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// AHB-Lite signals
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val ahb_haddr = Output(UInt(32.W)) // [31:0] // ahb bus address
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val ahb_hburst = Output(UInt(3.W)) // [2:0] // tied to 0
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val ahb_hmastlock = Output(Bool()) // tied to 0
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val ahb_hprot = Output(UInt(4.W)) // [3:0] // tied to 4'b0011
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val ahb_hsize = Output(UInt(3.W)) // [2:0] // size of bus transaction (possible values 0,1,2,3)
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val ahb_htrans = Output(UInt(2.W))
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val ahb_hwrite = Output(Bool()) // ahb bus write
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val ahb_hwdata = Output(UInt(64.W)) // [63:0] // ahb bus write data
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}
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class axi4_to_ahb extends Module with el2_lib with RequireAsyncReset with Config {
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val io = IO(new axi4_to_ahb_IO)
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val buf_rst = WireInit(Bool(), init = false.B)
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val buf_state_en = WireInit(Bool(), init = false.B)
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val ahbm_clk = Wire(Clock())
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val ahbm_addr_clk = Wire(Clock())
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val ahbm_data_clk = Wire(Clock())
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val idle :: cmd_rd :: cmd_wr :: data_rd :: data_wr :: done :: stream_rd :: stream_err_rd :: Nil = Enum(8)
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val buf_state = WireInit(idle)
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val buf_nxtstate = WireInit(idle)
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buf_state := withClock(ahbm_clk) { RegNext(Mux(buf_state_en.asBool(),buf_nxtstate,buf_state) & !buf_rst, 0.U) }
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//logic signals
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val slave_valid = WireInit(Bool(), init = false.B)
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val slave_ready = WireInit(Bool(), init = false.B)
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val slave_tag = WireInit(0.U(TAG.W)) // [TAG-1:0]
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val slave_rdata = WireInit(0.U(64.W)) // [63:0]
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val slave_opc = WireInit(0.U(4.W)) // [3:0]
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val wrbuf_en = WireInit(Bool(), init = false.B)
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val wrbuf_data_en = WireInit(Bool(), init = false.B)
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val wrbuf_cmd_sent = WireInit(Bool(), init = false.B)
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val wrbuf_rst = WireInit(Bool(), init = false.B)
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val wrbuf_vld = WireInit(Bool(), init = false.B)
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val wrbuf_data_vld = WireInit(Bool(), init = false.B)
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val wrbuf_tag = WireInit(0.U(TAG.W)) // [TAG-1:0]
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val wrbuf_size = WireInit(0.U(3.W)) // [2:0]
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val wrbuf_addr = WireInit(0.U(32.W)) // [31:0]
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val wrbuf_data = WireInit(0.U(64.W)) // [63:0]
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val wrbuf_byteen = WireInit(0.U(8.W)) // [7:0]
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val bus_write_clk_en = WireInit(Bool(), init = false.B)
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val bus_clk = Wire(Clock())
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val bus_write_clk = Wire(Clock())
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val master_valid = WireInit(Bool(), init = false.B)
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val master_ready = WireInit(0.U(1.W))
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val master_tag = WireInit(0.U(TAG.W)) // [TAG-1:0]
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val master_addr = WireInit(0.U(32.W)) // [31:0]
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val master_wdata = WireInit(0.U(64.W)) // [63:0]
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val master_size = WireInit(0.U(3.W)) // [2:0]
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val master_opc = WireInit(0.U(3.W)) // [2:0]
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val master_byteen = WireInit(0.U(8.W)) // [7:0]
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// Buffer signals (one entry buffer)
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val buf_addr = WireInit(0.U(32.W)) // [31:0]
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val buf_size = WireInit(0.U(2.W)) // [1:0]
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val buf_write = WireInit(Bool(), init = false.B)
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val buf_byteen = WireInit(0.U(8.W)) // [7:0]
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val buf_aligned = WireInit(Bool(), init = false.B)
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val buf_data = WireInit(0.U(64.W)) // [63:0]
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val buf_tag = WireInit(0.U(TAG.W)) // [TAG-1:0]
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//Miscellaneous signals
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// val buf_rst = WireInit(Bool(), init = false.B)
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val buf_tag_in = WireInit(0.U(TAG.W)) // [TAG-1:0]
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val buf_addr_in = WireInit(0.U(32.W)) // [31:0]
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val buf_byteen_in = WireInit(0.U(8.W)) // [7:0]
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val buf_data_in = WireInit(0.U(64.W)) // [63:0]
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val buf_write_in = WireInit(Bool(), init = false.B)
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val buf_aligned_in = WireInit(Bool(), init = false.B)
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val buf_size_in = WireInit(0.U(3.W)) // [2:0]
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// val buf_state_en = WireInit(Bool(), init = false.B)
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val buf_wr_en = WireInit(Bool(), init = false.B)
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val buf_data_wr_en = WireInit(Bool(), init = false.B)
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val slvbuf_error_en = WireInit(Bool(), init = false.B)
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val wr_cmd_vld = WireInit(Bool(), init = false.B)
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val cmd_done_rst = WireInit(Bool(), init = false.B)
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val cmd_done = WireInit(Bool(), init = false.B)
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val cmd_doneQ = WireInit(Bool(), init = false.B)
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val trxn_done = WireInit(Bool(), init = false.B)
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val buf_cmd_byte_ptr = WireInit(0.U(3.W)) // [2:0]
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val buf_cmd_byte_ptrQ = WireInit(0.U(3.W)) // [2:0]
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val buf_cmd_nxtbyte_ptr = WireInit(0.U(3.W)) // [2:0]
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val buf_cmd_byte_ptr_en = WireInit(Bool(), init = false.B)
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val found = WireInit(Bool(), init = false.B)
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val slave_valid_pre = WireInit(Bool(), init = false.B)
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val ahb_hready_q = WireInit(Bool(), init = false.B)
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val ahb_hresp_q = WireInit(Bool(), init = false.B)
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val ahb_htrans_q = WireInit(0.U(2.W)) // [1:0]
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val ahb_hwrite_q = WireInit(Bool(), init = false.B)
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val ahb_hrdata_q = WireInit(0.U(64.W)) // [63:0]
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val slvbuf_write = WireInit(Bool(), init = false.B)
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val slvbuf_error = WireInit(Bool(), init = false.B)
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val slvbuf_tag = WireInit(0.U(TAG.W)) // [TAG-1:0]
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val slvbuf_error_in = WireInit(Bool(), init = false.B)
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val slvbuf_wr_en = WireInit(Bool(), init = false.B)
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val bypass_en = WireInit(Bool(), init = false.B)
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val rd_bypass_idle = WireInit(Bool(), init = false.B)
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val last_addr_en = WireInit(Bool(), init = false.B)
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val last_bus_addr = WireInit(0.U(32.W)) // [31:0]
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// Clocks
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val buf_clken = WireInit(Bool(), init = false.B)
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val slvbuf_clken = WireInit(Bool(), init = false.B)
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val ahbm_addr_clken = WireInit(Bool(), init = false.B)
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val ahbm_data_clken = WireInit(Bool(), init = false.B)
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val buf_clk = Wire(Clock())
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//val slvbuf_clk = Wire(Clock())
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// val ahbm_clk = Wire(Clock())
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// val ahbm_addr_clk = Wire(Clock())
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// val ahbm_data_clk = Wire(Clock())
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def get_write_size(byteen: UInt) = {
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val byteen = WireInit(0.U(8.W))
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val size = ("b11".U & Fill(2, (byteen(7, 0) === "hff".U))) |
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("b10".U & (Fill(2, ((byteen(7, 0) === "hf0".U) | (byteen(7, 0) === "h0f".U))))) |
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("b01".U & (Fill(2, ((byteen(7, 0) === "hc0".U) | (byteen(7, 0) === "h30".U) | (byteen(7, 0) === "h0c".U) | (byteen(7, 0) === "h03".U)))))
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size
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}
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def get_write_addr(byteen_e: UInt) = {
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val byteen_e = WireInit(0.U(8.W))
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val addr = ("h0".U & (Fill(3, ((byteen_e(7, 0) === "hff".U) | (byteen_e(7, 0) === "h0f".U) | (byteen_e(7, 0) === "h03".U))))) |
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("h2".U & (Fill(3, (byteen_e(7, 0) === "h0c".U)))) |
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("h4".U & (Fill(3, ((byteen_e(7, 0) === "hf0".U) | (byteen_e(7, 0) === "h03".U))))) |
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("h6".U & (Fill(3, (byteen_e(7, 0) === "hc0".U))))
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addr
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}
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def get_nxtbyte_ptr(current_byte_ptr: UInt, byteen: UInt, get_next: Bool): UInt = {
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val start_ptr = Mux(get_next, current_byte_ptr + 1.U, current_byte_ptr)
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val temp = (0 until 8).map(j => (byteen(j) & (j.asUInt() >= start_ptr)) -> j.U)
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MuxCase(0.U, temp)
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}
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// // Write buffer
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// wrbuf_en := io.axi_awvalid & io.axi_awready & master_ready
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// wrbuf_data_en := io.axi_wvalid & io.axi_wready & master_ready
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// wrbuf_cmd_sent := master_valid & master_ready & (master_opc(2, 1) === "b01".U)
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// wrbuf_rst := wrbuf_cmd_sent & !wrbuf_en
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//
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// io.axi_awready := !(wrbuf_vld & !wrbuf_cmd_sent) & master_ready
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// io.axi_wready := !(wrbuf_data_vld & !wrbuf_cmd_sent) & master_ready
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// io.axi_arready := !(wrbuf_vld & wrbuf_data_vld) & master_ready
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// io.axi_rlast := true.B
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wr_cmd_vld := wrbuf_vld & wrbuf_data_vld
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master_valid := wr_cmd_vld | io.axi_arvalid
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master_tag := Mux(wr_cmd_vld.asBool(), wrbuf_tag(TAG - 1, 0), io.axi_arid(TAG - 1, 0))
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master_opc := Mux(wr_cmd_vld.asBool(), "b011".U, "b0".U)
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master_addr := Mux(wr_cmd_vld.asBool(), wrbuf_addr(31, 0), io.axi_araddr(31, 0))
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master_size := Mux(wr_cmd_vld.asBool(), wrbuf_size(2, 0), io.axi_arsize(2, 0))
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master_byteen := wrbuf_byteen(7, 0)
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master_wdata := wrbuf_data(63, 0)
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// AXI response channel signals
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io.axi_bvalid := slave_valid & slave_ready & slave_opc(3)
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io.axi_bresp := Mux(slave_opc(0), "b10".U, Mux(slave_opc(1), "b11".U, "b0".U))
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io.axi_bid := slave_tag(TAG - 1, 0)
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io.axi_rvalid := slave_valid & slave_ready & (slave_opc(3, 2) === "b0".U)
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io.axi_rresp := Mux(slave_opc(0), "b10".U, Mux(slave_opc(1), "b11".U, "b0".U))
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io.axi_rid := slave_tag(TAG - 1, 0)
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io.axi_rdata := slave_rdata(63, 0)
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slave_ready := io.axi_bready & io.axi_rready
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// Clock header logic
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bus_write_clk_en := io.bus_clk_en & ((io.axi_awvalid & io.axi_awready) | (io.axi_wvalid & io.axi_wready))
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bus_clk := rvclkhdr(clock, io.bus_clk_en, io.scan_mode)
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bus_write_clk := rvclkhdr(clock, bus_write_clk_en.asBool(), io.scan_mode)
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//State machine
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io.ahb_htrans := 0.U
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master_ready := 0.U
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buf_state_en := false.B
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buf_nxtstate := idle
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//buf_wr_en := 0.U
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buf_data_wr_en := 0.U
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slvbuf_error_in := 0.U
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slvbuf_error_en := 0.U
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buf_write_in := 0.U
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cmd_done := 0.U
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trxn_done := 0.U
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buf_cmd_byte_ptr_en := 0.U
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buf_cmd_byte_ptr := 0.U
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slave_valid_pre := 0.U
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slvbuf_wr_en := 0.U
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bypass_en := 0.U
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rd_bypass_idle := 0.U
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switch(buf_state) {
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is(idle) {
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master_ready := 1.U
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buf_write_in := (master_opc(2, 1) === "b01".U)
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buf_nxtstate := Mux(buf_write_in.asBool(), cmd_wr, cmd_rd)
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buf_state_en := master_valid & 1.U
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buf_wr_en := buf_state_en
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buf_data_wr_en := buf_state_en & (buf_nxtstate === cmd_wr)
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buf_cmd_byte_ptr_en := buf_state_en
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// ---------------------FROM FUNCTION CHECK LATER
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buf_cmd_byte_ptr := Mux(buf_write_in.asBool(), (get_nxtbyte_ptr(0.U, buf_byteen_in(7, 0), false.B)).asInstanceOf[UInt], master_addr(2, 0))
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bypass_en := buf_state_en
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rd_bypass_idle := bypass_en & (buf_nxtstate === cmd_rd)
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io.ahb_htrans := (Fill(2, bypass_en)) & "b10".U
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}
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is(cmd_rd) {
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buf_nxtstate := Mux((master_valid & (master_opc(2, 0) === "b000".U)).asBool(), stream_rd, data_rd)
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buf_state_en := ahb_hready_q & (ahb_htrans_q(1, 0) =/= "b0".U) & !ahb_hwrite_q
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cmd_done := buf_state_en & !master_valid
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slvbuf_wr_en := buf_state_en
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master_ready := (ahb_hready_q & (ahb_htrans_q(1, 0) =/= "b0".U) & !ahb_hwrite_q) & (Mux((master_valid & (master_opc(2, 0) === "b000".U)).asBool(), stream_rd, data_rd) === stream_rd) ////////////TBD////////
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buf_wr_en := master_ready
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bypass_en := master_ready & master_valid
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buf_cmd_byte_ptr := Mux(bypass_en.asBool(), master_addr(2, 0), buf_addr(2, 0))
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io.ahb_htrans := "b10".U & (Fill(2, (!buf_state_en | bypass_en)))
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}
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is(stream_rd) {
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master_ready := (ahb_hready_q & !ahb_hresp_q) & !(master_valid & master_opc(2, 1) === "b01".U)
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buf_wr_en := (master_valid & master_ready & (master_opc(2, 0) === "b000".U)) // update the fifo if we are streaming the read commands
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buf_nxtstate := Mux(ahb_hresp_q.asBool(), stream_err_rd, Mux((master_valid & master_ready & (master_opc(2, 0) === "b000".U)).asBool(), stream_rd, data_rd)) // assuming that the master accpets the slave response right away.
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buf_state_en := (ahb_hready_q | ahb_hresp_q)
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buf_data_wr_en := buf_state_en
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slvbuf_error_in := ahb_hresp_q
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slvbuf_error_en := buf_state_en
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slave_valid_pre := buf_state_en & !ahb_hresp_q // send a response right away if we are not going through an error response.
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cmd_done := buf_state_en & !master_valid // last one of the stream should not send a htrans
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bypass_en := master_ready & master_valid & (buf_nxtstate === stream_rd) & buf_state_en
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buf_cmd_byte_ptr := Mux(bypass_en.asBool(), master_addr(2, 0), buf_addr(2, 0))
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io.ahb_htrans := "b10".U & Fill(2, (!((buf_nxtstate =/= stream_rd) & buf_state_en)))
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slvbuf_wr_en := buf_wr_en// shifting the contents from the buf to slv_buf for streaming cases
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}
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is(stream_err_rd) {
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buf_nxtstate := data_rd
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buf_state_en := ahb_hready_q & (ahb_htrans_q(1, 0) =/= "b0".U) & !ahb_hwrite_q
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slave_valid_pre := buf_state_en
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slvbuf_wr_en := buf_state_en // Overwrite slvbuf with buffer
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buf_cmd_byte_ptr := buf_addr(2, 0)
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io.ahb_htrans := "b10".U(2.W) & Fill(2, !buf_state_en)
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}
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is(data_rd) {
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buf_nxtstate := done
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buf_state_en := (ahb_hready_q | ahb_hresp_q)
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buf_data_wr_en := buf_state_en
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slvbuf_error_in := ahb_hresp_q
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slvbuf_error_en := buf_state_en
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slvbuf_wr_en := buf_state_en
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}
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is(cmd_wr) {
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buf_nxtstate := data_wr
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trxn_done := ahb_hready_q & ahb_hwrite_q & (ahb_htrans_q(1, 0) =/= "b0".U)
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buf_state_en := trxn_done
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buf_cmd_byte_ptr_en := buf_state_en
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slvbuf_wr_en := buf_state_en
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buf_cmd_byte_ptr := Mux(trxn_done.asBool(), (get_nxtbyte_ptr(buf_cmd_byte_ptrQ(2, 0), buf_byteen(7, 0), true.B)).asInstanceOf[UInt], buf_cmd_byte_ptrQ)
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cmd_done := trxn_done & (buf_aligned | (buf_cmd_byte_ptrQ === "b111".U) | (buf_byteen((get_nxtbyte_ptr(buf_cmd_byte_ptrQ(2, 0), buf_byteen(7, 0), true.B))) === "b0".U))
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io.ahb_htrans := Fill(2, !(cmd_done | cmd_doneQ)) & "b10".U
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}
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is(data_wr) {
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buf_state_en := (cmd_doneQ & ahb_hready_q) | ahb_hresp_q
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master_ready := ((cmd_doneQ & ahb_hready_q) | ahb_hresp_q) & !ahb_hresp_q & slave_ready //////////TBD///////// // Ready to accept new command if current command done and no error
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buf_nxtstate := Mux((ahb_hresp_q | !slave_ready).asBool(), done, Mux((master_valid & master_ready).asBool(), Mux((master_opc(2, 1) === "b01".U), cmd_wr, cmd_rd), idle))
|
|
slvbuf_error_in := ahb_hresp_q
|
|
slvbuf_error_en := buf_state_en
|
|
buf_write_in := (master_opc(2, 1) === "b01".U)
|
|
buf_wr_en := buf_state_en & ((buf_nxtstate === cmd_wr) | (buf_nxtstate === cmd_rd))
|
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buf_data_wr_en := buf_wr_en
|
|
cmd_done := (ahb_hresp_q | (ahb_hready_q & (ahb_htrans_q(1, 0) =/= "b0".U) & ((buf_cmd_byte_ptrQ === "b111".U) | (buf_byteen((get_nxtbyte_ptr(buf_cmd_byte_ptrQ(2, 0), buf_byteen(7, 0), true.B))) === "b0".U))))
|
|
bypass_en := buf_state_en & buf_write_in & (buf_nxtstate === cmd_wr) // Only bypass for writes for the time being
|
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io.ahb_htrans := Fill(2, (!(cmd_done | cmd_doneQ) | bypass_en)) & "b10".U
|
|
slave_valid_pre := buf_state_en & (buf_nxtstate =/= done)
|
|
trxn_done := ahb_hready_q & ahb_hwrite_q & (ahb_htrans_q(1, 0) =/= "b0".U)
|
|
buf_cmd_byte_ptr_en := trxn_done | bypass_en
|
|
//val tmp_func = get_nxtbyte_ptr(Fill(3,0.U),buf_byteen_in(7,0),false.B)
|
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//val tmp_func2 = get_nxtbyte_ptr(buf_cmd_byte_ptrQ(2,0),buf_byteen(7,0),true.B)
|
|
buf_cmd_byte_ptr := Mux(bypass_en, get_nxtbyte_ptr(0.U, buf_byteen_in(7, 0), false.B), Mux(trxn_done, get_nxtbyte_ptr(buf_cmd_byte_ptrQ(2, 0), buf_byteen(7, 0), true.B), buf_cmd_byte_ptrQ))
|
|
}
|
|
is(done) {
|
|
buf_nxtstate := idle
|
|
buf_state_en := slave_ready
|
|
slvbuf_error_en := true.B
|
|
slave_valid_pre := true.B
|
|
}
|
|
}
|
|
|
|
buf_rst := false.B
|
|
cmd_done_rst := slave_valid_pre
|
|
buf_addr_in := Cat(master_addr(31,3),Mux((buf_aligned_in & (master_opc(2, 1) === "b01".U)).asBool(), get_write_addr(master_byteen(7, 0)), master_addr(2, 0)))
|
|
buf_tag_in := master_tag(TAG - 1, 0)
|
|
buf_byteen_in := wrbuf_byteen(7,0)
|
|
buf_data_in := Mux((buf_state === data_rd), ahb_hrdata_q(63, 0), master_wdata(63, 0))
|
|
buf_size_in := Mux((buf_aligned_in & (master_size(1, 0) === "b11".U) & (master_opc(2, 1) === "b01".U)).asBool(), get_write_size(master_byteen(7, 0)), master_size(1, 0))
|
|
buf_aligned_in := (master_opc(2, 0) === "b0".U) | // reads are always aligned since they are either DW or sideeffects
|
|
(master_size(1, 0) === "b0".U) | (master_size(1, 0) === "b01".U) | (master_size(1, 0) === "b10".U) | // Always aligned for Byte/HW/Word since they can be only for non-idempotent. IFU/SB are always aligned
|
|
((master_size(1, 0) === "b11".U) & ((master_byteen(7, 0) === "h3".U) | (master_byteen(7, 0) === "hc".U) | (master_byteen(7, 0) === "h30".U) | (master_byteen(7, 0) === "hc0".U) |
|
|
(master_byteen(7, 0) === "hf".U) | (master_byteen(7, 0) === "hf0".U) | (master_byteen(7, 0) === "hff".U)))
|
|
// Generate the ahb signals
|
|
io.ahb_haddr := Mux(bypass_en.asBool(), Cat(master_addr(31, 3), buf_cmd_byte_ptr(2, 0)), Cat(buf_addr(31, 3), buf_cmd_byte_ptr(2, 0)))
|
|
io.ahb_hsize := Mux(bypass_en.asBool(), Cat(0.U, (Fill(2, buf_aligned_in) & buf_size_in(1, 0))), (Cat("b0".U, (Fill(2, buf_aligned) & buf_size(1, 0)))))
|
|
|
|
io.ahb_hburst := "b0".U
|
|
io.ahb_hmastlock := "b0".U
|
|
io.ahb_hprot := Cat("b001".U, ~io.axi_arprot(2))
|
|
io.ahb_hwrite := Mux(bypass_en.asBool(), (master_opc(2, 1) === "b01".U), buf_write)
|
|
io.ahb_hwdata := buf_data(63, 0)
|
|
|
|
slave_valid := slave_valid_pre
|
|
slave_opc := Cat(Mux(slvbuf_write.asBool(), "b11".U, "b00".U), Fill(2, slvbuf_error) & "b10".U)
|
|
slave_rdata := Mux(slvbuf_error.asBool(), Fill(2, last_bus_addr(31, 0)), Mux((buf_state === done), buf_data(63, 0), ahb_hrdata_q(63, 0)))
|
|
slave_tag := slvbuf_tag(TAG - 1, 0)
|
|
|
|
last_addr_en := (io.ahb_htrans(1, 0) =/= "b0".U) & io.ahb_hready & io.ahb_hwrite
|
|
// Write buffer
|
|
wrbuf_en := io.axi_awvalid & io.axi_awready & master_ready
|
|
wrbuf_data_en := io.axi_wvalid & io.axi_wready & master_ready
|
|
wrbuf_cmd_sent := master_valid & master_ready & (master_opc(2, 1) === "b01".U)
|
|
wrbuf_rst := wrbuf_cmd_sent & !wrbuf_en
|
|
|
|
io.axi_awready := !(wrbuf_vld & !wrbuf_cmd_sent) & master_ready
|
|
io.axi_wready := !(wrbuf_data_vld & !wrbuf_cmd_sent) & master_ready
|
|
io.axi_arready := !(wrbuf_vld & wrbuf_data_vld) & master_ready
|
|
io.axi_rlast := true.B
|
|
|
|
//rvdffsc
|
|
wrbuf_vld := withClock(bus_clk) {RegNext(Mux(wrbuf_en.asBool(),1.U,wrbuf_vld) & !wrbuf_rst, 0.U)}
|
|
wrbuf_data_vld := withClock(bus_clk) {RegNext(Mux(wrbuf_data_en.asBool(),1.U, wrbuf_data_vld) & !wrbuf_rst, 0.U)}
|
|
//rvdffs
|
|
wrbuf_tag := withClock(bus_clk) {RegEnable(io.axi_awid(TAG - 1, 0), 0.U, wrbuf_en.asBool())}
|
|
wrbuf_size := withClock(bus_clk) {RegEnable(io.axi_awsize(2, 0), 0.U, wrbuf_en.asBool())}
|
|
//rvdffe
|
|
wrbuf_addr := rvdffe(io.axi_awaddr, wrbuf_en.asBool,bus_clk,io.scan_mode)
|
|
wrbuf_data := rvdffe(io.axi_wdata, wrbuf_data_en.asBool,bus_clk,io.scan_mode)
|
|
//rvdffs
|
|
wrbuf_byteen := withClock(bus_clk) {
|
|
RegEnable(io.axi_wstrb(7, 0), 0.U, wrbuf_data_en.asBool())
|
|
}
|
|
last_bus_addr := withClock(ahbm_clk) {
|
|
RegEnable(io.ahb_haddr(31, 0), 0.U, last_addr_en.asBool())
|
|
}
|
|
//sc
|
|
// buf_state := withClock(ahbm_clk) {
|
|
// RegNext(Mux(buf_state_en.asBool(),buf_nxtstate,buf_state) & !buf_rst, 0.U)
|
|
// }
|
|
//s
|
|
buf_write := withClock(buf_clk) {
|
|
RegEnable(buf_write_in, 0.U, buf_wr_en.asBool())
|
|
}
|
|
buf_tag := withClock(buf_clk) {
|
|
RegEnable(buf_tag_in(TAG - 1, 0), 0.U, buf_wr_en.asBool())
|
|
}
|
|
//e
|
|
buf_addr := rvdffe(buf_addr_in(31, 0),(buf_wr_en & io.bus_clk_en).asBool,clock,io.scan_mode)
|
|
//s
|
|
buf_size := withClock(buf_clk) {
|
|
RegEnable(buf_size_in(1, 0), 0.U, buf_wr_en.asBool())
|
|
}
|
|
buf_aligned := withClock(buf_clk) {
|
|
RegEnable(buf_aligned_in, 0.U, buf_wr_en.asBool())
|
|
}
|
|
buf_byteen := withClock(buf_clk) {
|
|
RegEnable(buf_byteen_in(7, 0), 0.U, buf_wr_en.asBool())
|
|
}
|
|
//e
|
|
buf_data := rvdffe(buf_data_in(63, 0),(buf_data_wr_en & io.bus_clk_en).asBool(),clock,io.scan_mode)
|
|
//s
|
|
slvbuf_write := withClock(buf_clk) {
|
|
RegEnable(buf_write, 0.U, slvbuf_wr_en.asBool())
|
|
}
|
|
slvbuf_tag := withClock(buf_clk) {
|
|
RegEnable(buf_tag(TAG - 1, 0), 0.U, slvbuf_wr_en.asBool())
|
|
}
|
|
slvbuf_error := withClock(ahbm_clk) {
|
|
RegEnable(slvbuf_error_in, 0.U, slvbuf_error_en.asBool())
|
|
}
|
|
//sc
|
|
cmd_doneQ := withClock(ahbm_clk) {
|
|
RegNext(Mux(cmd_done.asBool(),1.U,cmd_doneQ) & !cmd_done_rst, 0.U)
|
|
}
|
|
//rvdffs
|
|
buf_cmd_byte_ptrQ := withClock(ahbm_clk) {
|
|
RegEnable(buf_cmd_byte_ptr(2, 0), 0.U, buf_cmd_byte_ptr_en.asBool())
|
|
}
|
|
|
|
//rvdff
|
|
ahb_hready_q := withClock(ahbm_clk) {
|
|
RegNext(io.ahb_hready, 0.U)
|
|
}
|
|
ahb_htrans_q := withClock(ahbm_clk) {
|
|
RegNext(io.ahb_htrans(1, 0), 0.U)
|
|
}
|
|
ahb_hwrite_q := withClock(ahbm_addr_clk) {
|
|
RegNext(io.ahb_hwrite, 0.U)
|
|
}
|
|
ahb_hresp_q := withClock(ahbm_clk) {
|
|
RegNext(io.ahb_hresp, 0.U)
|
|
}
|
|
ahb_hrdata_q := withClock(ahbm_data_clk) {
|
|
RegNext(io.ahb_hrdata(63, 0), 0.U)
|
|
}
|
|
|
|
buf_clken := io.bus_clk_en & (buf_wr_en | slvbuf_wr_en | io.clk_override)
|
|
ahbm_addr_clken := io.bus_clk_en & ((io.ahb_hready & io.ahb_htrans(1)) | io.clk_override)
|
|
ahbm_data_clken := io.bus_clk_en & ((buf_state =/= idle) | io.clk_override)
|
|
|
|
//Clkhdr
|
|
buf_clk := rvclkhdr(clock, buf_clken, io.scan_mode)
|
|
ahbm_clk := rvclkhdr(clock, io.bus_clk_en, io.scan_mode)
|
|
ahbm_addr_clk := rvclkhdr(clock, ahbm_addr_clken, io.scan_mode)
|
|
ahbm_data_clk := rvclkhdr(clock, ahbm_data_clken, io.scan_mode)
|
|
}
|
|
|
|
object AXImain extends App {
|
|
println("Generate Verilog")
|
|
println((new chisel3.stage.ChiselStage).emitVerilog(new axi4_to_ahb()))
|
|
} |