PM7311 pmc-sierra, PM7311 Datasheet - Page 243

• Manufacturer Part Number: PM7311
• Description: Freedm 84a1024l Assp Telecom Standard Datasheet
• Manufacturer: pmc-sierra

Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2021832, Issue 2
11.2.4
RFRAG Memory Map
This internal memory must be written to setup Ingress HDLC Channel configuration. The default
value of this memory is 0. MPBurstLength[1:0] must = 00 for access to this memory.
Table 38 RFRAG Memory Map
Address
000
HDLC
CHANNEL #
(1024)
Record
Reserved
CUT_THRU
SDDSCRD_
OVR
SDDSCRD_
THR[5:0]
PTCL_PPP[1:0]
ACF_CPRS
PF_CPRS
SEQFMT_12
Bits
31:24
23:22
21
20:15
14:13
12
11
10
FREEDM 84A1024L ASSP Telecom Standard Product Data Sheet
Description
Must be written to 0 for correct operation.
Enables a cut-through mode in which data is output on the
Any-PHY bus as series of channel-interleaved partial packets.
00 – Cut-through disabled, full packet output
01 – Output partial packet every 1*AP_SEGSIZE bytes.
10 – Output partial packet every 2*AP_SEGSIZE bytes.
11 – Output partial packet every 3*AP_SEGSIZE bytes.
When cut-through is enabled, PTCL_PPP[1:0] must be set to
“10”.
Small datagram discard threshold override.
Set this bit to 1 to override the default 40-byte small datagram
discard threshold with the value programmed into the
SDDSCRD_THR[5:0] register.
Small datagram discard threshold.
When the SDDSCRD_OVR control bit is set to 1, program this
register to the byte size (0 to 56) under which small datagrams
will be discarded when an excessive number of datagrams are
waiting to be processed by the resequencing engine.
Protocol definition.
00 – PPP
01 – Frame Relay (only recognise UNI/NNI
10 – Transparent Mode
11 – Frame Relay (only recognise End-to-End
Address-and-Control field compression.
Set this bit to 1 to allow the reception of Address-and-Control
field compressed PPP headers. Uncompressed headers may
also be received when this bit is set, but must carry the
standard 0xFF and 0x03 values. This control bit is only used
in PPP mode.
Protocol field compression.
Set this bit to 1 to allow the reception of Protocol field
compressed PPP headers. Uncompressed headers may also
be received when this bit is set. This control bit is only used in
PPP mode.
Sequence number format.
This control bit is only used in PPP mode.
0 – 12 bits
1 – 24 bits
fragmentation format)
fragmentation format)
Released
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