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Add null mapper

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This commit is contained in:
Byron Lathi
2023-09-06 19:48:51 -07:00
parent a770d938de
commit 18140b32a0
5 changed files with 204 additions and 5 deletions
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20
hw/efinix_fpga/super6502.sv
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@@ -79,6 +79,7 @@ logic w_timer_cs;
logic w_multiplier_cs;
logic w_divider_cs;
logic w_uart_cs;
logic w_mapper_cs;
logic w_spi_cs;
addr_decode u_addr_decode(
@@ -90,6 +91,7 @@ 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)
);
@@ -100,6 +102,7 @@ logic [7:0] w_multiplier_data_out;
logic [7:0] w_divider_data_out;
logic [7:0] w_uart_data_out;
logic [7:0] w_spi_data_out;
logic [7:0] w_mapper_data_out;
logic [7:0] w_sdram_data_out;
always_comb begin
@@ -119,6 +122,8 @@ always_comb begin
cpu_data_out = w_spi_data_out;
else if (w_sdram_cs)
cpu_data_out = w_sdram_data_out;
else if (w_mapper_cs)
cpu_data_out = w_mapper_data_out;
else
cpu_data_out = 'x;
end
@@ -203,6 +208,19 @@ 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),
.rw(cpu_rwb),
.i_data(cpu_data_in),
.o_data(w_mapper_data_out)
);
sdram_adapter u_sdram_adapter(
.i_cpuclk(clk_2),
@@ -214,7 +232,7 @@ sdram_adapter u_sdram_adapter(
.i_cs(w_sdram_cs),
.i_rwb(cpu_rwb),
.i_addr(cpu_addr),
.i_addr(w_sdram_addr),
.i_data(cpu_data_in),
.o_data(w_sdram_data_out),