S/UNI®-ATLAS-3200 Telecom Standard Product Data Sheet
Preliminary
Register 0x031: IBCIF Dropped Cells Counter
Bit
31:8
7:0
Type
Function
Unused
DCOUNT[7:0]
Default
X
X
R
This register provides a count of cells dropped due to parity errors or FIFO overflow.
DCOUNT[7:0]
A write to this register, to the IBCIF Read Cells Counter, or the S/UNI-ATLAS-3200
Identity/Load Counts register loads this register with the number of cells dropped by the
IBCIF due to parity errors or FIFO overflow since the last such write, and resets the internal
counter to zero. The update is done in such a fashion that no events are missed if a counter
reset and a dropped cell occur simultaneously. During this transfer, the TIP bit in the S/UNI-
ATLAS-3200 Identity/Load Counts register will be logic 1. The contents of this register are
valid when the TIP bit returns to logic 0; however, another transfer should not be requested
for at least 100ns after TIP returns to 0. If this register is not polled regularly, the count value
will saturate at 0xFF.
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-1990553, Issue 4
178
PMC [ PMC-SIERRA, INC ]
