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Add diagram, throw some code together

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Byron Lathi
2023-09-07 23:41:17 -07:00
parent 5fc71567f2
commit 02ac7d5213
5 changed files with 171 additions and 33 deletions
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107
doc/top.drawio Normal file
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@@ -0,0 +1,107 @@
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22
hw/efinix_fpga/addr_decode.sv
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@@ -1,6 +1,8 @@
module addr_decode
(
input [15:0] i_addr,
input [24:0] i_addr,
input config_reg_sel,
output o_rom_cs,
output o_leds_cs,
@@ -9,18 +11,16 @@ module addr_decode
output o_divider_cs,
output o_uart_cs,
output o_spi_cs,
output o_mapper_cs,
output o_sdram_cs
);
assign o_rom_cs = i_addr >= 16'hf000 && i_addr <= 16'hffff;
assign o_timer_cs = i_addr >= 16'heff8 && i_addr <= 16'heffb;
assign o_multiplier_cs = i_addr >= 16'heff0 && i_addr <= 16'heff7;
assign o_divider_cs = i_addr >= 16'hefe8 && i_addr <= 16'hefef;
assign o_uart_cs = i_addr >= 16'hefe6 && i_addr <= 16'hefe7;
assign o_spi_cs = i_addr >= 16'hefd8 && i_addr <= 16'hefdb;
assign o_mapper_cs = i_addr >= 16'hefb7 && i_addr <= 16'hefd7;
assign o_leds_cs = i_addr == 16'hefff;
assign o_sdram_cs = i_addr < 16'he000;
assign o_rom_cs = (i_addr >= 25'hf000 && i_addr <= 25'hffff) && ~config_reg_sel;
assign o_timer_cs = (i_addr >= 25'heff8 && i_addr <= 25'heffb) && ~config_reg_sel;
assign o_multiplier_cs = (i_addr >= 25'heff0 && i_addr <= 25'heff7) && ~config_reg_sel;
assign o_divider_cs = (i_addr >= 25'hefe8 && i_addr <= 25'hefef) && ~config_reg_sel;
assign o_uart_cs = (i_addr >= 25'hefe6 && i_addr <= 25'hefe7) && ~config_reg_sel;
assign o_spi_cs = (i_addr >= 25'hefd8 && i_addr <= 25'hefdb) && ~config_reg_sel;
assign o_leds_cs = (i_addr == 25'hefff) && ~config_reg_sel;
assign o_sdram_cs = (i_addr < 25'he000 || i_addr >= 25'h10000) && ~config_reg_sel;
endmodule

19
hw/efinix_fpga/control_registers.sv Normal file
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@@ -0,0 +1,19 @@
module control_registers #(
parameter START = 16'h0a00,
parameter SIZE = 16'h0600
)(
input i_clk,
input i_rst,
input logic o_selected,
input i_rwb,
input [15:0] i_addr,
input [7:0] i_data,
output logic [7:0] o_data
);
logic [7:0] regs [SIZE];
assign o_selected = (addr >= START && addr > START + SIZE);
endmodule

54
hw/efinix_fpga/super6502.sv
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@@ -1,4 +1,8 @@
module super6502
#(
parameter CONTROL_REG_START = 16'h0a00,
parameter CONTROL_REG_SIZE = 16'h0600
)
(
input logic i_sysclk, // Controller Clock (100MHz)
input logic i_sdrclk, // t_su and t_wd clock (200MHz)
@@ -71,6 +75,14 @@ always @(posedge clk_2) begin
end
end
logic w_control_reg_cs;
// 0a00 - 0xffff
assign w_control_reg_cs = (cpu_addr >= CONTROL_REG_START && cpu_addr < CONTROL_REG_START + CONTROL_REG_SIZE);
// The w_control_reg_cs is redundant but whatever
assign o_mapper_cs = (cpu_addr >= 16'h0a00 && cpu_addr <= 25'h0a20) && w_control_reg_cs;
logic w_rom_cs;
logic w_leds_cs;
@@ -83,7 +95,8 @@ logic w_mapper_cs;
logic w_spi_cs;
addr_decode u_addr_decode(
.i_addr(cpu_addr),
.i_addr(w_sdram_addr),
.config_reg_sel(w_control_reg_cs),
.o_rom_cs(w_rom_cs),
.o_leds_cs(w_leds_cs),
.o_timer_cs(w_timer_cs),
@@ -91,7 +104,6 @@ addr_decode u_addr_decode(
.o_divider_cs(w_divider_cs),
.o_uart_cs(w_uart_cs),
.o_spi_cs(w_spi_cs),
.o_mapper_cs(w_mapper_cs),
.o_sdram_cs(w_sdram_cs)
);
@@ -128,8 +140,21 @@ always_comb begin
cpu_data_out = 'x;
end
logic [24:0] w_sdram_addr;
mapper u_mapper(
.clk(clk_2),
.rst(~cpu_resb),
.cpu_addr(cpu_addr),
.sdram_addr(w_sdram_addr),
.cs(w_mapper_cs),
.rwb(cpu_rwb),
.i_data(cpu_data_in),
.o_data(w_mapper_data_out)
);
rom #(.DATA_WIDTH(8), .ADDR_WIDTH(12)) u_rom(
.addr(cpu_addr[11:0]),
.addr(w_sdram_addr[11:0]),
.clk(clk_2),
.data(w_rom_data_out)
);
@@ -152,7 +177,7 @@ timer u_timer(
.o_data(w_timer_data_out),
.cs(w_timer_cs),
.rwb(cpu_rwb),
.addr(cpu_addr[1:0]),
.addr(w_sdram_addr[1:0]),
.irqb(w_timer_irqb)
);
@@ -163,7 +188,7 @@ multiplier u_multiplier(
.o_data(w_multiplier_data_out),
.cs(w_multiplier_cs),
.rwb(cpu_rwb),
.addr(cpu_addr[2:0])
.addr(w_sdram_addr[2:0])
);
divider_wrapper u_divider(
@@ -174,7 +199,7 @@ divider_wrapper u_divider(
.o_data(w_divider_data_out),
.cs(w_divider_cs),
.rwb(cpu_rwb),
.addr(cpu_addr[2:0])
.addr(w_sdram_addr[2:0])
);
logic w_uart_irqb;
@@ -187,7 +212,7 @@ uart_wrapper u_uart(
.o_data(w_uart_data_out),
.cs(w_uart_cs),
.rwb(cpu_rwb),
.addr(cpu_addr[0]),
.addr(w_sdram_addr[0]),
.rx_i(uart_rx),
.tx_o(uart_tx),
.irqb(w_uart_irqb)
@@ -198,7 +223,7 @@ spi_controller spi_controller(
.i_rst(~cpu_resb),
.i_cs(w_spi_cs),
.i_rwb(cpu_rwb),
.i_addr(cpu_addr[1:0]),
.i_addr(w_sdram_addr[1:0]),
.i_data(cpu_data_in),
.o_data(w_spi_data_out),
@@ -208,19 +233,6 @@ spi_controller spi_controller(
.i_spi_miso(spi_miso)
);
logic [24:0] w_sdram_addr;
mapper u_mapper(
.clk(clk_2),
.rst(~cpu_resb),
.cpu_addr(cpu_addr),
.sdram_addr(w_sdram_addr),
.cs(w_mapper_cs),
.rwb(cpu_rwb),
.i_data(cpu_data_in),
.o_data(w_mapper_data_out)
);
sdram_adapter u_sdram_adapter(
.i_cpuclk(clk_2),

2
hw/efinix_fpga/super6502.xml
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@@ -1,5 +1,5 @@
<?xml version="1.0" encoding="UTF-8"?>
<efx:project name="super6502" description="" last_change_date="Wed September 6 2023 20:09:59" location="/home/byron/ServerProjects/super6502/hw/efinix_fpga" sw_version="2022.2.322" last_run_state="pass" last_run_tool="efx_map" last_run_flow="syn" config_result_in_sync="true" design_ood="sync" place_ood="sync" route_ood="sync" xmlns:efx="http://www.efinixinc.com/enf_proj" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.efinixinc.com/enf_proj enf_proj.xsd">
<efx:project name="super6502" description="" last_change_date="Thu September 7 2023 19:23:34" location="/home/byron/ServerProjects/super6502/hw/efinix_fpga" sw_version="2022.2.322" last_run_state="pass" last_run_tool="efx_pgm" last_run_flow="bitstream" config_result_in_sync="true" design_ood="sync" place_ood="sync" route_ood="sync" xmlns:efx="http://www.efinixinc.com/enf_proj" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.efinixinc.com/enf_proj enf_proj.xsd">
<efx:device_info>
<efx:family name="Trion"/>
<efx:device name="T20F256"/>