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Add read flag to sd controller

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Read flag is set when the sd controller reads response data in from the
sd card. When the cpu reads from the controller, the flag is reset.

This flag does not trigger an interrupt, it mmust be polled.
This commit is contained in:
Byron Lathi
2022-04-10 23:16:10 -05:00
parent 385efb2511
commit f5f1d7ccc6
2 changed files with 54 additions and 17 deletions
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37
hw/fpga/super6502.sv
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@@ -73,6 +73,7 @@ logic [7:0] uart_data_out;
logic [7:0] irq_data_out;
logic [7:0] board_io_data_out;
logic [7:0] mm_data_out;
logic [7:0] sd_data_out;
logic sdram_cs;
logic rom_cs;
@@ -85,8 +86,8 @@ logic mm_cs2;
logic sd_cs;
cpu_clk cpu_clk(
.inclk0(clk_50),
.c0(clk)
.inclk0(clk_50),
.c0(clk)
);
always @(posedge clk) begin
@@ -106,16 +107,16 @@ logic [23:0] mm_addr;
assign mm_addr = {mm_MO, cpu_addr[11:0]};
memory_mapper memory_mapper(
.clk(clk),
.clk(clk),
.rst(rst),
.rw(cpu_rwb),
.cs(mm_cs1),
.MM_cs(mm_cs2),
.RS(cpu_addr[3:0]),
.MA(cpu_addr[15:12]),
.data_in(cpu_data_in),
.data_out(mm_data_out),
.MO(mm_MO)
.rw(cpu_rwb),
.cs(mm_cs1),
.MM_cs(mm_cs2),
.RS(cpu_addr[3:0]),
.MA(cpu_addr[15:12]),
.data_in(cpu_data_in),
.data_out(mm_data_out),
.MO(mm_MO)
);
addr_decode decode(
@@ -126,8 +127,8 @@ addr_decode decode(
.uart_cs(uart_cs),
.irq_cs(irq_cs),
.board_io_cs(board_io_cs),
.mm_cs1(mm_cs1),
.mm_cs2(mm_cs2),
.mm_cs1(mm_cs1),
.mm_cs2(mm_cs2),
.sd_cs(sd_cs)
);
@@ -143,8 +144,10 @@ always_comb begin
cpu_data_out = irq_data_out;
else if (board_io_cs)
cpu_data_out = board_io_data_out;
else if (mm_cs1)
cpu_data_out = mm_data_out;
else if (mm_cs1)
cpu_data_out = mm_data_out;
else if (sd_cs)
cpu_data_out = sd_data_out;
else
cpu_data_out = 'x;
end
@@ -231,7 +234,9 @@ sd_controller sd_controller(
.o_sd_cmd(o_sd_cmd),
.i_sd_data(i_sd_data),
.o_sd_data(o_sd_data)
.o_sd_data(o_sd_data),
.data_out(sd_data_out)
);
always_ff @(posedge clk_50) begin