Parallel ports

For test consideration, two ports are multiplexed : the high speed serial links 0 and 1 can be replaced by parallel ports thanks to a multiplexor. This enables the access to R3P without using the serial link.

.35

muxps0, muxps1: 3.3v / 5v IN
When this signal is high, the parallel access of port 0 (resp. 1) is used. The choice of using port 0 (resp. port 1) as a parallel port or a serial port must be made while the nreset signal is active.
datastrobe0, datastrobe1: 3.3v / 5v IN
This signal commands on its falling edge the writing of the incoming data in the input fifo of port 0 (resp. 1).
datain0(8:0), datain1(8:0): 3.3v / 5v IN
9-bit incoming character on parallel port 0 (resp. 1).
fccreceived0, fccreceived1: 3.3v / 5v IN
This signal is used to control the characters flow. When high, the output part of the port 0 (resp. 1) gets an emission credit of 32 characters.
sendfcc0, sendfcc1: 3.3v OUT
When the input port 0 (resp. 1) has consumed(routed) a flit (32 characters), it commands its output port to raise the signal sendfcc for one ckin clock cycle. When the transmitter detects that signal active, it sends another flit to the router.
senddata0, senddata1: 3.3v OUT
This flag goes high for one ckin clock cycle whenever a data character is available on the output port 0 (resp. 1).
dataout0(8:0), dataout1(8:0): 3.3v OUT
9-bit outgoing character from parallel port 0 (resp. 1).

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