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/*
* PicoSoC - A simple example SoC using PicoRV32
*
* Copyright (C) 2017 Clifford Wolf <clifford@clifford.at>
*
* 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 hx8kdemo (
input clk,
output ser_tx,
input ser_rx,
output [7:0] leds,
output flash_csb,
output flash_clk,
inout flash_io0,
inout flash_io1,
inout flash_io2,
inout flash_io3
);
reg [5:0] reset_cnt = 0;
wire resetn = &reset_cnt;
always @(posedge clk) begin
reset_cnt <= reset_cnt + !resetn;
end
wire flash_io0_oe, flash_io0_do, flash_io0_di;
wire flash_io1_oe, flash_io1_do, flash_io1_di;
wire flash_io2_oe, flash_io2_do, flash_io2_di;
wire flash_io3_oe, flash_io3_do, flash_io3_di;
SB_IO #(
.PIN_TYPE(6'b 1010_01),
.PULLUP(1'b 0)
) flash_io_buf [3:0] (
.PACKAGE_PIN({flash_io3, flash_io2, flash_io1, flash_io0}),
.OUTPUT_ENABLE({flash_io3_oe, flash_io2_oe, flash_io1_oe, flash_io0_oe}),
.D_OUT_0({flash_io3_do, flash_io2_do, flash_io1_do, flash_io0_do}),
.D_IN_0({flash_io3_di, flash_io2_di, flash_io1_di, flash_io0_di})
);
wire iomem_valid;
reg iomem_ready;
wire [3:0] iomem_wstrb;
wire [31:0] iomem_addr;
wire [31:0] iomem_wdata;
reg [31:0] iomem_rdata;
reg [31:0] gpio;
reg [4:0] gpio_shr;
assign leds = gpio >> gpio_shr;
always @(posedge clk) begin
if (!resetn) begin
gpio <= 0;
gpio_shr <= 0;
end else begin
iomem_ready <= 0;
if (iomem_valid && !iomem_ready && iomem_addr[31:24] == 8'h 03) begin
iomem_ready <= 1;
iomem_rdata <= gpio;
if (iomem_wstrb[0]) gpio[ 7: 0] <= iomem_wdata[ 7: 0];
if (iomem_wstrb[1]) gpio[15: 8] <= iomem_wdata[15: 8];
if (iomem_wstrb[2]) gpio[23:16] <= iomem_wdata[23:16];
if (iomem_wstrb[3]) gpio[31:24] <= iomem_wdata[31:24];
end
if (&leds && gpio_shr < 10) begin
gpio_shr <= gpio_shr + 1;
end
end
end
picosoc soc (
.clk (clk ),
.resetn (resetn ),
.ser_tx (ser_tx ),
.ser_rx (ser_rx ),
.flash_csb (flash_csb ),
.flash_clk (flash_clk ),
.flash_io0_oe (flash_io0_oe),
.flash_io1_oe (flash_io1_oe),
.flash_io2_oe (flash_io2_oe),
.flash_io3_oe (flash_io3_oe),
.flash_io0_do (flash_io0_do),
.flash_io1_do (flash_io1_do),
.flash_io2_do (flash_io2_do),
.flash_io3_do (flash_io3_do),
.flash_io0_di (flash_io0_di),
.flash_io1_di (flash_io1_di),
.flash_io2_di (flash_io2_di),
.flash_io3_di (flash_io3_di),
.iomem_valid (iomem_valid ),
.iomem_ready (iomem_ready ),
.iomem_wstrb (iomem_wstrb ),
.iomem_addr (iomem_addr ),
.iomem_wdata (iomem_wdata ),
.iomem_rdata (iomem_rdata )
);
endmodule
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