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PM7329 S/UNI-APEX-1K800
DATASHEET
PMC-2010141
ISSUE 2
ATM TRAFFIC MANAGER AND SWITCH
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
105
Register 0x20: Low Priority Interrupt Status Register
Bit
Type
Function
Default
31:7
Unused
0
6
R
MPIdleStatus
1
5
R
SarRxEmptyStatus
1
4
R
SarRxRdyStatus
1
3:0
R
SarTxRdyStatus[3:0]
0
Each bit in the register is masked with the low priority interrupt status mask
register. The results are then NOR’d together with the other low priority interrupt
register to produce the state of INTLOB pin.
SarTxRdyStatus[3:0]
Status bit indicating that one of four SAR read buffers contains a least one
cell for reading.
Warning
: Software should not attempt to read this status or
clear the associated interrupt mask immediately after extracting a cell from
the S/UNI-APEX-1K800. There is a latency of 3 BCLKs + 2 SYSCLKs
between the last word of a cell read out and this signal going inactive.
Removing the mask prematurely may generate an unintentional interrupt.
SarRxRdyStatus
Status bit indicating that SAR receive buffer is ready to accept the next cell.
SarRxEmptyStatus
Status bit indicating that SAR receive buffer is empty. Typically used for
diagnostic writes.
Warning
: Software should not attempt to read this status or clear the
associated interrupt mask immediately after injecting a cell into the S/UNI-
APEX-1K800. There is a latency of 5 SYSCLKs between the last word of a
cell written out and this signal going inactive. Removing the mask
prematurely will generate an unintentional interrupt.
MPIdleStatus
Status bit indicating the memory port is idle and ready to accept a new
command. This signal is the inverse of MPBusy found in the Memory Port
Control Register.