92 lines
2.2 KiB
Coq
92 lines
2.2 KiB
Coq
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/*
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* PicoSoC - A simple example SoC using PicoRV32
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*
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* Copyright (C) 2017 Clifford Wolf <clifford@clifford.at>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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module ice40up5k_spram #(
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// We current always use the whole SPRAM (128 kB)
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parameter integer WORDS = 32768
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) (
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input clk,
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input [3:0] wen,
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input [21:0] addr,
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input [31:0] wdata,
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output [31:0] rdata
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);
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wire cs_0, cs_1;
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wire [31:0] rdata_0, rdata_1;
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assign cs_0 = !addr[14];
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assign cs_1 = addr[14];
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assign rdata = addr[14] ? rdata_1 : rdata_0;
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SB_SPRAM256KA ram00 (
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.ADDRESS(addr[13:0]),
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.DATAIN(wdata[15:0]),
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.MASKWREN({wen[1], wen[1], wen[0], wen[0]}),
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.WREN(wen[1]|wen[0]),
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.CHIPSELECT(cs_0),
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.CLOCK(clk),
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.STANDBY(1'b0),
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.SLEEP(1'b0),
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.POWEROFF(1'b1),
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.DATAOUT(rdata_0[15:0])
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);
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SB_SPRAM256KA ram01 (
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.ADDRESS(addr[13:0]),
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.DATAIN(wdata[31:16]),
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.MASKWREN({wen[3], wen[3], wen[2], wen[2]}),
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.WREN(wen[3]|wen[2]),
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.CHIPSELECT(cs_0),
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.CLOCK(clk),
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.STANDBY(1'b0),
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.SLEEP(1'b0),
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.POWEROFF(1'b1),
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.DATAOUT(rdata_0[31:16])
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);
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SB_SPRAM256KA ram10 (
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.ADDRESS(addr[13:0]),
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.DATAIN(wdata[15:0]),
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.MASKWREN({wen[1], wen[1], wen[0], wen[0]}),
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.WREN(wen[1]|wen[0]),
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.CHIPSELECT(cs_1),
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.CLOCK(clk),
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.STANDBY(1'b0),
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.SLEEP(1'b0),
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.POWEROFF(1'b1),
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.DATAOUT(rdata_1[15:0])
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);
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SB_SPRAM256KA ram11 (
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.ADDRESS(addr[13:0]),
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.DATAIN(wdata[31:16]),
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.MASKWREN({wen[3], wen[3], wen[2], wen[2]}),
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.WREN(wen[3]|wen[2]),
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.CHIPSELECT(cs_1),
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.CLOCK(clk),
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.STANDBY(1'b0),
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.SLEEP(1'b0),
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.POWEROFF(1'b1),
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.DATAOUT(rdata_1[31:16])
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);
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endmodule
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