RELEASED
PM7351 S/UNI-VORTEX
DATA SHEET
PMC-1980582
ISSUE 5
OCTAL SERIAL LINK MULTIPLEXER
Register 0x012: Microprocessor Extract FIFO Control
Bit
Type
Function
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Unused
Unused
EXTCRCCHK
EXTCRCPR
EXTABRT
EXTFSEL[2]
EXTFSEL[1]
EXTFSEL[0]
X
X
0
1
X
0
0
0
R/W
R/W
W
R/W
R/W
R/W
EXTFSEL[2:0]:
The EXTFSEL [2:0] bits are used to select the one of eight Microprocessor
Extract FIFOs for a cell read operation. The value of EXTFSEL[2:0]
corresponds to the index of the serial link (i.e. the ‘n’ in RXDn+/-) on which
the cell was received. The Microprocessor Extract FIFO has to be selected
prior to starting the cell transfer. Due to synchronization delays, a read of the
Microprocessor Cell Buffer Data register should not be initiated until two
REFCLK periods after completion of the write of these bits.
EXTABRT:
The EXTABRT bit allows the microprocessor to discard a cell without reading
the remaining contents. If EXTABRT is set to a logic 1 when previously logic
0, the extract pointer is reset, effectively discarding the remaining contents of
the cell. Setting EXTABRT after the last read (i.e. at the beginning of the next
cell) has no effect. To abort a cell, the microprocessor must have read at
least the first word of the cell but no more than 56 bytes.
Due to synchronization delays, no cell extraction operation should be initiated
until two REFCLK periods after completion of the write of this bit.
EXTABRT is not readable.
It is cleared on every read from normal mode Microprocessor Cell Data
register.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
77
PMC [ PMC-SIERRA, INC ]
