PM7385 FREEDM-84A672
DATA SHEET
PMC-1990114
ISSUE 6
84 LINK, 672 CHANNEL FRAME ENGINE AND DATA LINK MANAGER
WITH ANY-PHY PACKET INTERFACE
Reserved:
The reserved bit must be set low for correct operation of the FREEDM-
84A672 device.
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.
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 20 – CRC[1:0] Settings
CRC[1]
CRC[0]
Operation
0
0
1
1
0
1
0
1
No CRC
CRC-CCITT
CRC-32
Reserved
PROV:
The indirect provision enable bit (PROV) reports the channel provision enable
flag read from the channel provision RAM after an indirect channel read
operation has completed. The provision enable flag to be written to the
channel provision RAM, in an indirect write operation, must be set up in this
register before triggering the write. When PROV is set high, the HDLC
processor will service requests for data from the TCAS672 block. When
PROV is set low, the HDLC processor will ignore requests from the TCAS672
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
126
PMC [ PMC-SIERRA, INC ]
