PM5366-PI datasheet(178/267 Pages) PMC

178 / 267 page

PRELIMINARY

PM5366 TEMAP-84

DATASHEET

PMC-2010672

ISSUE 1

HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER

AND M13 MULTIPLEXER

PROPRIETARY AND CONFIDENTIAL

166

software flag. If the EMPTY FIFO software flag is not set, FIFO emptying will

delayed until the FIFO fill level is exceeded.

5. Read the RDLC Data register.

6. Read the RDLC Status register.

7. If OVR = 1, then discard last frame and go to step 1. Overrun causes a reset

of FIFO pointers. Any packets that may have been in the FIFO are lost.

8. If COLS = 1, then set the EMPTY FIFO software flag.

9. If PKIN = 1, increment the PACKET COUNT. If the FIFO is desired to be

emptied as soon as a complete packet is received, set the EMPTY FIFO

software flag. If the EMPTY FIFO software flag is not set, FIFO emptying will

delayed until the FIFO fill level is exceeded.

10.Start the processing of FIFO data. Use the PBS[2:0] packet byte status bits

to decide what is to be done with the FIFO data.

If PBS[2:0] = 001, discard data byte read in step 5 and set the LINK ACTIVE

software flag.

If PBS[2:0] = 010, discard the data byte read in step 5 and clear the LINK

ACTIVE software flag.

If PBS[2:0] = 1XX, store the last byte of the packet, decrement the PACKET

COUNT, and check the PBS[1:0] bits for CRC or NVB errors before deciding

whether or not to keep the packet.

If PBS[2:0] = 000, store the packet data.

11.If FE = 0 and INTR = 1 or FE = 0 and EMPTY FIFO = 1, go to step 5 else

clear the EMPTY FIFO software flag and leave this interrupt service routine to

wait for the next interrupt.

The link state is typically a local software variable. The link state is inactive if the

RDLC is receiving all ones or receiving bit-oriented codes which contain a

sequence of eight ones. The link state is active if the RDLC is receiving flags or

data.

If the RDLC data transfer is operating in the polled mode, processor operation is

exactly as shown above for the interrupt driven mode, except that the entry to the

service routine is from a timer, rather than an interrupt.

PM5366-PI Datasheet(PDF) 178 Page - PMC-Sierra, Inc