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pcs: rx: Add premature end state 

Without this state, receiving would immediately go low. However, figure
24-11 shows that receiving should go low only after an additional code
group (the second idle) is received.

Fixes: d351291 ("Initial commit")
Signed-off-by: Sean Anderson <seanga2@gmail.com>
This commit is contained in:
Sean Anderson 2022-08-06 15:18:26 -04:00
parent e4bbc08620
commit d2b4f9b061
1 changed files with 9 additions and 2 deletions
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11
rtl/pcs.v
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@ -439,7 +439,8 @@ module pcs_rx (
localparam START_K = 2; localparam START_K = 2;
localparam BAD_SSD = 3; localparam BAD_SSD = 3;
localparam DATA = 4; localparam DATA = 4;
localparam FAILED = 5; localparam PREMATURE = 5;
localparam FAILED = 6;
reg start, flush; reg start, flush;
wire activity, idle, indicate; wire activity, idle, indicate;
@ -570,7 +571,7 @@ end
`CODE_I: begin `CODE_I: begin
err_next = 1; err_next = 1;
if (aligned[4:0] == `CODE_I) if (aligned[4:0] == `CODE_I)
state_next = IDLE; state_next = PREMATURE;
end end
default: default:
err_next = 1; err_next = 1;
@ -579,6 +580,11 @@ end
if (!indicate) if (!indicate)
state_next = DATA; state_next = DATA;
end end
PREMATURE: begin
valid_next = 0;
if (indicate)
state_next = IDLE;
end
FAILED: begin FAILED: begin
err_next = 1; err_next = 1;
rx_next = 0; rx_next = 0;
@ -623,6 +629,7 @@ end
START_K: state_text = "START_K"; START_K: state_text = "START_K";
BAD_SSD: state_text = "BAD_SSD"; BAD_SSD: state_text = "BAD_SSD";
DATA: state_text = "DATA"; DATA: state_text = "DATA";
PREMATURE: state_text = "PREMATURE";
FAILED: state_text = "FAILED"; FAILED: state_text = "FAILED";
endcase endcase
end end