PM7344 Datasheet, PDF (144/293 Pages) PMC-Sierra, Inc – SATURN QUAD T1/E1 MULTI-PHY USER NETWORK INTERFACE DEVICE

DATA SHEET
PMC-950449
ISSUE 6
PM7344 S/UNI-MPH
MULTI-PHY USER NETWORK INTERFACE
Registers 02BH, 12BH, 22BH and 32BH: E1-FRMR CRC Error Counter - MSB
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Type
R
R
R
R
Function
OVR
NEWDATA
Unused
Unused
Unused
Unused
CRCE9
CRCE8
Default
0
0
X
X
X
X
X
X
These registers contain the most significant two bits of the 10-bit CRC error
counter value, updated every second.
NEWDATA:
The NEWDATA flag bit indicates that the counter register contents have
been updated with a new count value accumulated over the last 1 second
interval. It is set to logic 1 when the CRC error counter data is transferred
into the counter registers, and is reset to logic 0 when this register is read.
This bit can be polled to determine the 1 second timing boundary used by the
FRMR.
OVR:
The OVR flag bit indicates that the counter register contents have not been
read within the last 1 second interval, and therefore have been over-written.
It is set to logic 1 if CRC error counter data is transferred into the counter
registers before the previous data has been read out, and is reset to logic 0
when this register is read.
This CRC error count is distinct from that of PMON because it is guaranteed to
be an accurate count of the number of CRC error in one second; whereas,
PMON relies on externally initiated transfers which may not be one second apart.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 128