| Line 400... |
Line 400... |
end if;
|
end if;
|
if linko.txack = '1' then
|
if linko.txack = '1' then
|
-- send character
|
-- send character
|
v.txpacket := not s_txfifo_rdata(8);
|
v.txpacket := not s_txfifo_rdata(8);
|
end if;
|
end if;
|
if linko.running = '0' then
|
|
-- not connected
|
|
v.rxpacket := '0';
|
|
v.txpacket := '0';
|
|
end if;
|
|
|
|
-- Clear the discard flag when the link is explicitly disabled.
|
|
if linkdis = '1' then
|
|
v.txdiscard := '0';
|
|
end if;
|
|
|
|
-- Update RX fifo pointers.
|
-- Update RX fifo pointers.
|
if (rxread = '1') and (r.rxfifo_rvalid = '1') then
|
if (rxread = '1') and (r.rxfifo_rvalid = '1') then
|
-- read from fifo
|
-- read from fifo
|
v.rxfifo_raddr := std_logic_vector(unsigned(r.rxfifo_raddr) + 1);
|
v.rxfifo_raddr := std_logic_vector(unsigned(r.rxfifo_raddr) + 1);
|
| Line 460... |
Line 450... |
-- Update room in TX fifo (use new value of txfifo_waddr).
|
-- Update room in TX fifo (use new value of txfifo_waddr).
|
v_tmptxroom := unsigned(r.txfifo_raddr) - unsigned(v.txfifo_waddr) - 1;
|
v_tmptxroom := unsigned(r.txfifo_raddr) - unsigned(v.txfifo_waddr) - 1;
|
v.txfull := bool_to_logic(v_tmptxroom = 0);
|
v.txfull := bool_to_logic(v_tmptxroom = 0);
|
v.txhalff := not v_tmptxroom(v_tmptxroom'high);
|
v.txhalff := not v_tmptxroom(v_tmptxroom'high);
|
|
|
-- If an error occurs, set a flag to discard the current packet.
|
-- If the link is lost, set a flag to discard the current packet.
|
if (linko.errdisc or linko.errpar or
|
if linko.running = '0' then
|
linko.erresc or linko.errcred) = '1' then
|
|
v.rxeep := v.rxeep or v.rxpacket; -- use new value of rxpacket
|
v.rxeep := v.rxeep or v.rxpacket; -- use new value of rxpacket
|
v.txdiscard := v.txdiscard or v.txpacket; -- use new value of txpacket
|
v.txdiscard := v.txdiscard or v.txpacket; -- use new value of txpacket
|
v.rxpacket := '0';
|
v.rxpacket := '0';
|
v.txpacket := '0';
|
v.txpacket := '0';
|
end if;
|
end if;
|
|
|
|
-- Clear the discard flag when the link is explicitly disabled.
|
|
if linkdis = '1' then
|
|
v.txdiscard := '0';
|
|
end if;
|
|
|
-- Drive control signals to RX fifo.
|
-- Drive control signals to RX fifo.
|
s_rxfifo_raddr <= v.rxfifo_raddr; -- using new value of rxfifo_raddr
|
s_rxfifo_raddr <= v.rxfifo_raddr; -- using new value of rxfifo_raddr
|
s_rxfifo_wen <= (not r.rxfull) and (linko.rxchar or r.rxeep);
|
s_rxfifo_wen <= (not r.rxfull) and (linko.rxchar or r.rxeep);
|
s_rxfifo_waddr <= r.rxfifo_waddr;
|
s_rxfifo_waddr <= r.rxfifo_waddr;
|
if r.rxeep = '1' then
|
if r.rxeep = '1' then
|
