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