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DATA SHEET
PM7367 FREEDM-32P32
ISSUE 2
PMC-1991499
FRAME ENGINE AND DATA LINK MANAGER
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMER’S INTERNAL USE
206
FPTR[8:0]:
The indirect FIFO block pointer (FPTR[8:0]) informs the partial packet buffer
processor the circular linked list of blocks to use for a FIFO for the channel.
The FIFO pointer to be written to the channel provision RAM, in an indirect
write operation, must be set up in this register before triggering the write. The
FIFO pointer value can be any one of the block numbers provisioned, by
indirect block write operations, to form the circular buffer.
DELIN:
The indirect delineate enable bit (DELIN) configures the HDLC processor to
perform flag sequence insertion and bit stuffing on the outgoing data stream.
The delineate enable bit to be written to the channel provision RAM, in an
indirect channel write operation, must be set up in this register before
triggering the write. When DELIN is set high, flag sequence insertion, bit
stuffing and ,optionally, CRC generation is performed on the outgoing HDLC
data stream. When DELIN is set low, the HDLC processor does not perform
any processing (flag sequence insertion, bit stuffing nor CRC generation) on
the outgoing stream. DELIN reflects the value written until the completion of
a subsequent indirect channel read operation.
IDLE:
The interframe time fill bit (IDLE) configures the HDLC processor to use flag
bytes or HDLC idle as the interframe time fill between HDLC packets. The
value of IDLE to be written to the channel provision RAM, in an indirect
channel write operation, must be set up in this register before triggering the
write. When IDLE is set low, the HDLC processor uses flag bytes as the
interframe time fill. When IDLE is set high, the HDLC processor uses HDLC
idle (all one's bit with no bit-stuffing pattern is transmitted) as the interframe
time fill. IDLE reflects the value written until the completion of a subsequent
indirect channel read operation.
CRC[1:0]:
The CRC algorithm (CRC[1:0]) configures the HDLC processor to perform
CRC generation on the outgoing HDLC data stream. The value of CRC[1:0]
to be written to the channel provision RAM, in an indirect channel write
operation, must be set up in this register before triggering the write. CRC[1:0]
is ignored when DELIN is low. CRC[1:0] reflects the value written until the
completion of a subsequent indirect channel read operation.
Table 22 – CRC[1:0] Settings
CRC[1]
CRC[0]
Operation
0
0
No CRC