PM7311 pmc-sierra, PM7311 Datasheet - Page 236

• 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 Microprocessor Accessible Memories
11.2.1
Certain regions of the internal and external memories are used to configure and monitor the
operation of the FREEDM 84A1024L.
Unlike the Normal Mode registers, these entries are not cleared upon read unless specified.
Specified setups are required for correct operation of the chip. The default value for these
memory bits is X unless specified.
PM-12 Memory Map
This internal memory is used for storing statistics counters. This memory is accessed through the
Memory Port Control register and is burst accessible. This memory is initialized to 0 on reset
although on start up, small erred packets may pass through the chip causing the counts to be non-
zero. The contents of the memory must be read every 2 seconds in order to ensure counters do not
overflow. Counters will be reset to 0 once read. If the counter is allowed to overflow, it will not
rollover but will hold the maximum count value until read.
Note 1: Byte count includes 2-bytes per event for the CI prepend. Byte count (not including CI
prepend) can be determined using corresponding event count.
Note 2: Byte count includes 2-bytes per frame/packet for the error CI prepend.
Note 3: Byte count is invalid for HDLC channels which have ‘cut-through’ enabled. (I.e. when
the CUT_THRU[1:0] bits in RFRAG memory are set to a value other than “00”.)
Table 35 PM-12 Memory Map
Address
0000
RX_HDLC_CH
(1K)
03FF
0400
RX_HDLC_CH
(1K)
07FF
0800
RX_HDLC_CH
(1K)
0BFF
Record
Unused
RX_BYTE_CNT
Unused
RX_PKT_CNT
Unused
RX_FRM_ABRT
FREEDM 84A1024L ASSP Telecom Standard Product Data Sheet
Bits
31:26
25:0
31:26
25:0
31:26
25:0
Description
X
X
X
Rx byte count per HDLC channel
Rx packet count per HDLC channel
Rx framing aborts per HDLC channel
Released
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