PM7312 pmc-sierra, PM7312 Datasheet - Page 64

• Manufacturer Part Number: PM7312
• Description: Freedm 32a1024l Assp Telecom Standard Datasheet
• Manufacturer: pmc-sierra

Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2021833, Issue 2
10.7 CI Tear Down Procedure
10.8 Restrictions on Any-PHY to CI Mapping
2. Disable EXSBI channel
3. Reduce LOST timer for all constituent CIs to 10ms (this is not required, just suggested in case
4. Wait for AP_NCHNKS (in RFRAG Memory Map) to go to zero.
A CI tear-down procedure must be followed when decommissioning an active CI to avoid loss of
resources shared among all active CIs. Since the decommissioned CI continues to hold up to one
LSB record, the algorithm that assigns active CI’s from the pool of inactive CI’s should recycle
previously used CI’s before assigning a previously unused CI. This will result in the best use of
shared resources.
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 the
2. Read the Resequencing Active (RESEQ_ACT) bit and the FIFO Active (FIFO_ACT) bit in the
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.
holes remain)
CI undergoing decommissioning
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.
FREEDM 32A1024L ASSP Telecom Standard Product Data Sheet
Released
64