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[FIRMWARE/ATARI ST] pl2303 buffer management

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This commit is contained in:
harbaum
2015-06-15 11:38:19 +00:00
parent 4e103a2639
commit 100b261302
2 changed files with 6 additions and 1 deletions
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3
cores/mist/io_fifo.v
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@@ -38,6 +38,7 @@ module io_fifo #(
input out_strobe,
input out_enable,
output [DEPTH-1:0] space,
output empty,
output data_available,
output full
@@ -53,6 +54,8 @@ assign full = (readP == (writeP + 1));
assign empty = (readP == writeP);
assign data_available = (readP != writeP);
assign space = readP - writeP - 1;
// the strobes may not be in the right clock domain, so bring them into the
// local clock domain
reg in_strobeD, in_strobeD2;

4
cores/mist/mfp.v
View File

@@ -88,6 +88,7 @@ io_fifo mfp_in_fifo (
.out_strobe (1'b0),
.out_enable (serial_cpu_data_read && serial_data_in_available),
.space (serial_data_in_space),
.empty (serial_data_in_empty),
.full (serial_data_in_full),
.data_available (serial_data_in_available)
@@ -98,6 +99,7 @@ reg serial_cpu_data_read, serial_cpu_data_readD;
wire serial_data_in_available;
wire [7:0] serial_data_in_cpu;
wire serial_data_in_empty;
wire [3:0] serial_data_in_space;
always @(negedge clk) begin
serial_cpu_data_readD <= serial_cpu_data_read;
@@ -249,7 +251,7 @@ wire [31:0] bitrate =
(timerd_state == 12'h260)?32'd50: // 50 bit/s (80)
32'h80000001; // unsupported bit rate
wire [7:0] input_fifo_status = { 5'd0,
wire [7:0] input_fifo_status = { serial_data_in_space, 1'b0,
serial_data_in_empty, serial_data_in_full, serial_data_in_available };
wire [7:0] parity =