PM7347 datasheet(285/341 Pages) PMC

285 / 341 page

S/UNI®-JET Data Sheet

Released

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use

285

Document ID: PMC-1990267, Issue 3

FE is the internal FIFO empty status.

LA is the state of the LINK ACTIVE software flag.

At points 1 and 5 the first flag after all-ones or abort is detected. A dummy byte is written in the

FIFO, FE goes low, and an interrupt goes high. When the interrupt is detected by the processor it

reads the dummy byte, the FIFO becomes empty, and the interrupt is removed. The LINK

ACTIVE (LA) software flag is set to logic one.

At points 2 and 6 the last byte of a packet is detected and interrupt goes high. When the interrupt

is detected by the processor, it reads the data and status registers until the FIFO becomes empty.

The interrupt is removed as soon as the RDLC Status Register is read since the FIFO fill level of

8 bytes has not been exceeded. It is possible to store many packets in the FIFO and empty the

FIFO when the FIFO fill level is exceeded. In either case the processor should use this interrupt to

count the number of packets written into the FIFO. The packet count or a software time-out can

be used as a signal to empty the FIFO.

At point 3 the FIFO fill level of 8 bytes is exceeded and interrupt goes high. When the interrupt is

detected by the processor it must read the data and status registers until the FIFO becomes empty

and the interrupt is removed.

At points 4 or 7 an abort character is detected, a dummy byte is written into the FIFO, and

interrupt goes high. When the interrupt is detected by the processor it must read the data and

status registers until the FIFO becomes empty and the interrupt is removed. The LINK ACTIVE

software flag is cleared.

13.14 PRGD Pattern Generation

A pseudo-random or repetitive pattern can be inserted or extracted in the PLCP payload (if PLCP

framing is enabled) or in the DS3, E3, J2, or Arbitrary framing format payload (if PLCP framing

is disabled). It cannot be inserted into the ATM cell payload.

The pattern generator can be configured to generate pseudo random patterns or repetitive patterns

as shown in Figure 22:

Figure 22 PRGD Pattern Generator

LENGTH

TAP

PM7347 Datasheet(PDF) 285 Page - PMC-Sierra, Inc