PM7311 pmc-sierra, PM7311 Datasheet - Page 68

• 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
10.8 Restrictions on Any-PHY to CI Mapping
The tear-down procedure is comprised of the following seven steps:
1. Remove the CI from the CI Lookup table to ensure no additional datagrams are received for
2. Read the Resequencing Active (RESEQ_ACT) bit and the FIFO Active (FIFO_ACT) bit in
3. If resequencing is flagged as active set the Lost Timeout Period (LOST_CNT) register to
4. Periodically read the RESEQ_ACT and FIFO_ACT bits until both are inactive
5. Read the MSB record associated with the CI and extract the valid LSB record pointer, if
6. If applicable, clear the LSB status for the active LSB record. Each 32-bit location within the
7. Clear connection context memory for the CI. At this point tear-down is completed
For proper operation:
1. No CI may be shared across multiple Any-PHY channels.
2. A non-sequenced CI value may be shared among various DLCI’s within a single HDLC
3. In multilink applications, the sequenced CI value corresponding to a particular DLCI\COS
4. HDLC channels of a ML bundle must map to the same Any-PHY channel.
the CI undergoing decommissioning
the connection context memory for the CI. If both bits are inactive skip the next two steps
“0001” in the connection context memory for the CI
applicable. To identify a valid LSB record pointer within the MSB record structure all 128
locations of the MSB record must be read and examined. Bit 15, the 16th bit, of each 32-bit
data word returned indicates whether the lower 15-bits identify a valid LSB record pointer
(LSB_POINTER). This pointer is used to determine what LSB status locations to clear for the
CI being decommissioned. An MSB record is extracted from the external resequencing
SDRAM memory by reading 128 consecutive locations beginning at the address as
determined by the following equation: MSB Record begin address = 800,000H + CI_number
x 80H.
LSB record status field contains status for 16 datagrams. Therefore to clear the status for the
entire 128-location LSB record, 8 LSB status locations must be cleared to zero. The 8
consecutive locations requiring clearing begin at the address determined by the following
equation: LSB status begin address = 400,000H + LSB_POINTER x 8H.
channel.
value must be shared across all HDLC channels of the bundle. However, except in the case of
the default CI, the sequenced CI value must NOT be shared across different DLCI\COS
values.
FREEDM 84A1024L ASSP Telecom Standard Product Data Sheet
Released
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