S/UNI®-JET Data Sheet
Released
5. FE is the internal FIFO empty status.
6. 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
PS
TAP
1
2
3
32
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-1990267, Issue 3
285
PMC [ PMC-SIERRA, INC ]
