The-Homebrew-Cloud/SummerCart64
2
0
Fork 0
mirror of https://github.com/Polprzewodnikowy/SummerCart64.git synced 2024-12-27 21:41:55 +01:00
Code Issues Packages Projects Releases Wiki Activity

dma rewrite finish

Browse Source
This commit is contained in:
Mateusz Faderewski 2024-07-21 03:39:10 +02:00
parent cab8ac521a
commit 856f6948ab
2 changed files with 105 additions and 107 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

202
fw/rtl/memory/memory_dma.sv
View File

@ -35,9 +35,9 @@ module memory_dma (
e_mem_bus_state mem_bus_state;
e_mem_bus_state next_mem_bus_state;
logic mem_bus_wdata_buffer_ready;
// logic mem_bus_wdata_buffer_ack;
// logic [1:0] mem_bus_wmask_buffer;
logic mem_bus_wdata_ready;
logic mem_bus_wdata_empty;
logic mem_bus_wdata_end;
logic [1:0] mem_bus_wdata_valid;
logic [15:0] mem_bus_wdata_buffer;
@ -67,6 +67,11 @@ module memory_dma (
mem_bus_last_transfer = (mem_bus_remaining_bytes == 27'd0);
mem_bus_almost_last_transfer = (mem_bus_remaining_bytes <= 27'd2);
mem_bus_wdata_end = mem_bus_last_transfer;
mem_bus_wdata_valid = (mem_bus_unaligned_end && mem_bus_almost_last_transfer) ? 2'b10 :
mem_bus_unaligned_start ? 2'b01 :
2'b11;
case (mem_bus_state)
MEM_BUS_STATE_IDLE: begin
if (dma_start) begin
@ -77,7 +82,7 @@ module memory_dma (
MEM_BUS_STATE_WAIT: begin
if (dma_stop || mem_bus_last_transfer) begin
next_mem_bus_state = MEM_BUS_STATE_IDLE;
end else if (mem_bus_wdata_buffer_ready || mem_bus_rdata_ready) begin
end else if (mem_bus_wdata_ready || !mem_bus_wdata_empty || mem_bus_rdata_ready) begin
next_mem_bus_state = MEM_BUS_STATE_TRANSFER;
end
end
@ -86,7 +91,7 @@ module memory_dma (
if (mem_bus.ack) begin
if (dma_stop || mem_bus_last_transfer) begin
next_mem_bus_state = MEM_BUS_STATE_IDLE;
end else if (!(mem_bus_wdata_buffer_ready || mem_bus_rdata_ready)) begin
end else if (!(mem_bus_wdata_ready || !mem_bus_wdata_empty || mem_bus_rdata_ready)) begin
next_mem_bus_state = MEM_BUS_STATE_WAIT;
end
end
@ -110,6 +115,10 @@ module memory_dma (
mem_bus_rdata_buffer <= mem_bus.rdata;
end
if (mem_bus_wdata_ready) begin
mem_bus_wdata_empty <= 1'b0;
end
case (mem_bus_state)
MEM_BUS_STATE_IDLE: begin
mem_bus.request <= 1'b0;
@ -121,12 +130,13 @@ module memory_dma (
mem_bus_unaligned_start <= dma_scb.starting_address[0];
mem_bus_unaligned_end <= (dma_scb.starting_address[0] ^ dma_scb.transfer_length[0]);
mem_bus_rdata_end <= 1'b0;
mem_bus_wdata_empty <= 1'b1;
end
end
MEM_BUS_STATE_WAIT: begin
if (!dma_stop && !mem_bus_last_transfer) begin
if (mem_bus_wdata_buffer_ready || mem_bus_rdata_ready) begin
if (mem_bus_wdata_ready || !mem_bus_wdata_empty || mem_bus_rdata_ready) begin
mem_bus.request <= 1'b1;
mem_bus_unaligned_start <= 1'b0;
mem_bus.wdata <= (dma_scb.byte_swap ? {mem_bus_wdata_buffer[7:0], mem_bus_wdata_buffer[15:8]} : mem_bus_wdata_buffer);
@ -140,13 +150,14 @@ module memory_dma (
mem_bus.wmask <= 2'b01;
mem_bus_remaining_bytes <= (mem_bus_remaining_bytes - 27'd1);
end
mem_bus_wdata_empty <= 1'b1;
end
end
end
MEM_BUS_STATE_TRANSFER: begin
if (!dma_stop && !mem_bus_last_transfer) begin
if (mem_bus.ack && (mem_bus_wdata_buffer_ready || mem_bus_rdata_ready)) begin
if (mem_bus.ack && (mem_bus_wdata_ready || !mem_bus_wdata_empty || mem_bus_rdata_ready)) begin
mem_bus.request <= 1'b1;
mem_bus.wdata <= (dma_scb.byte_swap ? {mem_bus_wdata_buffer[7:0], mem_bus_wdata_buffer[15:8]} : mem_bus_wdata_buffer);
mem_bus.wmask <= 2'b11;
@ -155,6 +166,7 @@ module memory_dma (
mem_bus.wmask <= 2'b10;
mem_bus_remaining_bytes <= (mem_bus_remaining_bytes - 27'd1);
end
mem_bus_wdata_empty <= 1'b1;
end
end
end
@ -163,120 +175,106 @@ module memory_dma (
endcase
end
assign mem_bus_wdata_buffer_ready = 1'b0;
// assign mem_bus_rdata_ready = 1'b1;
// RX FIFO controller
// typedef enum bit [1:0] {
// RX_FIFO_BUS_STATE_IDLE,
// RX_FIFO_BUS_STATE_TRANSFER_1,
// RX_FIFO_BUS_STATE_TRANSFER_2,
// RX_FIFO_BUS_STATE_WAIT
// } e_rx_fifo_bus_state;
typedef enum bit [2:0] {
RX_FIFO_BUS_STATE_IDLE,
RX_FIFO_BUS_STATE_WAIT,
RX_FIFO_BUS_STATE_TRANSFER_1,
RX_FIFO_BUS_STATE_TRANSFER_2,
RX_FIFO_BUS_STATE_ACK
} e_rx_fifo_bus_state;
// e_rx_fifo_bus_state rx_fifo_bus_state;
// e_rx_fifo_bus_state next_rx_fifo_bus_state;
e_rx_fifo_bus_state rx_fifo_bus_state;
e_rx_fifo_bus_state next_rx_fifo_bus_state;
// logic rx_fifo_read_delayed;
// logic rx_fifo_buffer_shift;
// logic rx_fifo_unaligned_start;
// logic rx_fifo_unaligned_end;
logic rx_fifo_shift;
logic rx_fifo_shift_delayed;
logic [1:0] rx_fifo_valid;
always_ff @(posedge clk) begin
// if (reset || dma_stop) begin
// rx_fifo_bus_state <= RX_FIFO_BUS_STATE_IDLE;
// end else begin
// rx_fifo_bus_state <= next_rx_fifo_bus_state;
// end
if (reset || dma_stop) begin
rx_fifo_bus_state <= RX_FIFO_BUS_STATE_IDLE;
end else begin
rx_fifo_bus_state <= next_rx_fifo_bus_state;
end
end
always_comb begin
// next_rx_fifo_bus_state = rx_fifo_bus_state;
next_rx_fifo_bus_state = rx_fifo_bus_state;
// fifo_bus.rx_read = 1'b0;
// rx_fifo_buffer_shift = 1'b0;
rx_fifo_shift = 1'b0;
// case (rx_fifo_bus_state)
// RX_FIFO_BUS_STATE_IDLE: begin
// if (dma_start && dma_scb.direction) begin
// next_rx_fifo_bus_state = RX_FIFO_BUS_STATE_TRANSFER_1;
// if (dma_scb.starting_address[0]) begin
// next_rx_fifo_bus_state = RX_FIFO_BUS_STATE_TRANSFER_2;
// end
// end
// end
fifo_bus.rx_read = 1'b0;
// RX_FIFO_BUS_STATE_TRANSFER_1,
// RX_FIFO_BUS_STATE_TRANSFER_2: begin
// fifo_bus.rx_read = (!no_bytes_left && !fifo_bus.rx_empty);
// rx_fifo_buffer_shift = no_bytes_left;
// if (fifo_bus.rx_read || no_bytes_left) begin
// if (rx_fifo_bus_state == RX_FIFO_BUS_STATE_TRANSFER_1) begin
// next_rx_fifo_bus_state = RX_FIFO_BUS_STATE_TRANSFER_2;
// end else begin
// next_rx_fifo_bus_state = RX_FIFO_BUS_STATE_WAIT;
// end
// end
// end
case (rx_fifo_bus_state)
RX_FIFO_BUS_STATE_IDLE: begin
if (dma_start && dma_scb.direction) begin
next_rx_fifo_bus_state = RX_FIFO_BUS_STATE_WAIT;
end
end
// RX_FIFO_BUS_STATE_WAIT: begin
// if (mem_bus_wdata_buffer_ready && mem_bus_wdata_buffer_ack) begin
// if (no_bytes_left) begin
// next_rx_fifo_bus_state = RX_FIFO_BUS_STATE_IDLE;
// end else begin
// next_rx_fifo_bus_state = RX_FIFO_BUS_STATE_TRANSFER_1;
// end
// end
// end
RX_FIFO_BUS_STATE_WAIT: begin
if (mem_bus_wdata_end) begin
next_rx_fifo_bus_state = RX_FIFO_BUS_STATE_IDLE;
end else if (mem_bus_wdata_empty) begin
next_rx_fifo_bus_state = RX_FIFO_BUS_STATE_TRANSFER_1;
end
end
// default: begin
// next_rx_fifo_bus_state = RX_FIFO_BUS_STATE_IDLE;
// end
// endcase
RX_FIFO_BUS_STATE_TRANSFER_1: begin
fifo_bus.rx_read = (!fifo_bus.rx_empty && rx_fifo_valid[1]);
if (!fifo_bus.rx_empty || !rx_fifo_valid[1]) begin
next_rx_fifo_bus_state = RX_FIFO_BUS_STATE_TRANSFER_2;
rx_fifo_shift = 1'b1;
end
end
RX_FIFO_BUS_STATE_TRANSFER_2: begin
fifo_bus.rx_read = (!fifo_bus.rx_empty && rx_fifo_valid[1]);
if (!fifo_bus.rx_empty || !rx_fifo_valid[1]) begin
next_rx_fifo_bus_state = RX_FIFO_BUS_STATE_ACK;
rx_fifo_shift = 1'b1;
end
end
RX_FIFO_BUS_STATE_ACK: begin
if (mem_bus_wdata_ready) begin
next_rx_fifo_bus_state = RX_FIFO_BUS_STATE_WAIT;
end
end
default: begin
next_rx_fifo_bus_state = RX_FIFO_BUS_STATE_IDLE;
end
endcase
end
always_ff @(posedge clk) begin
// rx_fifo_read_delayed <= (fifo_bus.rx_read || rx_fifo_buffer_shift);
mem_bus_wdata_ready <= 1'b0;
rx_fifo_shift_delayed <= rx_fifo_shift;
// if (rx_fifo_read_delayed) begin
// mem_bus_wdata_buffer <= {mem_bus_wdata_buffer[7:0], fifo_bus.rx_rdata};
// end
if (rx_fifo_shift) begin
rx_fifo_valid <= {rx_fifo_valid[0], 1'bX};
end
// case (rx_fifo_bus_state)
// RX_FIFO_BUS_STATE_IDLE: begin
// mem_bus_wdata_buffer_ready <= 1'b0;
// if (dma_start) begin
// mem_bus_rx_transfer_end <= 1'b0;
// rx_fifo_unaligned_start <= dma_scb.starting_address[0];
// rx_fifo_unaligned_end <= (dma_scb.starting_address[0] ^ dma_scb.transfer_length[0]);
// end
// end
if (rx_fifo_shift_delayed) begin
if (rx_fifo_bus_state == RX_FIFO_BUS_STATE_ACK) begin
mem_bus_wdata_ready <= 1'b1;
end
mem_bus_wdata_buffer <= {mem_bus_wdata_buffer[7:0], fifo_bus.rx_rdata};
end
// RX_FIFO_BUS_STATE_TRANSFER_1,
// RX_FIFO_BUS_STATE_TRANSFER_2: begin end
case (rx_fifo_bus_state)
RX_FIFO_BUS_STATE_WAIT: begin
if (mem_bus_wdata_empty) begin
rx_fifo_valid <= mem_bus_wdata_valid;
end
end
// RX_FIFO_BUS_STATE_WAIT: begin
// mem_bus_wdata_buffer_ready <= 1'b1;
// mem_bus_wmask_buffer <= 2'b11;
// if (rx_fifo_unaligned_start) begin
// mem_bus_wmask_buffer <= 2'b01;
// end
// if (no_bytes_left) begin
// mem_bus_rx_transfer_end <= 1'b1;
// if (rx_fifo_unaligned_end) begin
// mem_bus_wmask_buffer <= 2'b10;
// end
// end
// if (mem_bus_wdata_buffer_ack) begin
// rx_fifo_unaligned_start <= 1'b0;
// mem_bus_wdata_buffer_ready <= 1'b0;
// end
// end
// default: begin end
// endcase
default: begin end
endcase
end
@ -330,7 +328,7 @@ module memory_dma (
TX_FIFO_BUS_STATE_TRANSFER_1: begin
fifo_bus.tx_write = (!fifo_bus.tx_full && tx_fifo_valid[1]);
if (fifo_bus.tx_write || !tx_fifo_valid[1]) begin
if (!fifo_bus.tx_full || !tx_fifo_valid[1]) begin
next_tx_fifo_bus_state = TX_FIFO_BUS_STATE_TRANSFER_2;
tx_fifo_shift = 1'b1;
end
@ -338,7 +336,7 @@ module memory_dma (
TX_FIFO_BUS_STATE_TRANSFER_2: begin
fifo_bus.tx_write = (!fifo_bus.tx_full && tx_fifo_valid[1]);
if (fifo_bus.tx_write || !tx_fifo_valid[1]) begin
if (!fifo_bus.tx_full || !tx_fifo_valid[1]) begin
next_tx_fifo_bus_state = TX_FIFO_BUS_STATE_WAIT;
tx_fifo_shift = 1'b1;
if (!mem_bus_rdata_ack && !tx_fifo_waiting && mem_bus_rdata_end) begin
@ -404,7 +402,7 @@ module memory_dma (
(dma_scb.start && !dma_scb.stop) ||
dma_start ||
(mem_bus_state != MEM_BUS_STATE_IDLE) ||
// (rx_fifo_bus_state != RX_FIFO_BUS_STATE_IDLE) ||
(rx_fifo_bus_state != RX_FIFO_BUS_STATE_IDLE) ||
(tx_fifo_bus_state != TX_FIFO_BUS_STATE_IDLE)
);
end

10
fw/tests/benches/memory_dma_tb.sv
View File

@ -42,9 +42,9 @@ module memory_dma_tb;
);
fifo_bus_fifo_mock #(
.DEPTH(16),
.FILL_RATE(16),
.DRAIN_RATE(16)
.DEPTH(8),
.FILL_RATE(3),
.DRAIN_RATE(3)
) fifo_bus_fifo_mock (
.clk(clk),
.reset(reset),
@ -90,8 +90,8 @@ module memory_dma_tb;
start = 1'b1;
direction = 1'b0;
byte_swap = 1'b0;
starting_address = 27'hFFF0;
transfer_length = 27'd32;
starting_address = 27'hFFF1;
transfer_length = 27'd64;
#1;
start = 1'b0;