PM7344 S/UNI-MPH
DATA SHEET
PMC-950449
ISSUE 6
MULTI-PHY USER NETWORK INTERFACE
The interrupt is cleared at the start of the next RFDL Data Register read that
results in an empty FIFO buffer. This is independent of the FIFO buffer fill
level for which the interrupt is programmed. If there is still data remaining in
the buffer, RDLINT will remain high. An interrupt due to a RFDL FIFO buffer
overrun condition is not cleared on a RFDL Data Register read but on a
RFDL Status Register read. The RDLINT output can always be forced low by
disabling the RFDL (setting the EN bit in the RFDL Configuration Register to
logic 0, or by disabling the internal HDLC receiver in the S/UNI-MPH Receive
Data Link Configuration Register), or by forcing the RFDL to terminate
reception (setting the TR bit in the RFDL Configuration Register to logic 1).
The RDLINT output may be forced low by disabling the interrupts with the
RFDL Interrupt Status/Control Register. However, the internal interrupt latch
is not cleared, and the state of this latch can still be read through the RFDL
Interrupt Status/Control Register.
7. The RDLEOM[x] output goes high:
1) immediately on detection of RFDL FIFO buffer overrun,
2) when the data byte written into the RFDL FIFO buffer due to an end of
message condition is read,
3) when the data byte written into the RFDL FIFO buffer due to an abort
condition is read, or,
4) when the data byte written into the RFDL FIFO buffer due to the transition
from receiving all ones to flags is read.
RDLEOM[x] is set low by reading the RFDL Status Register or by disabling
the RFDL.
8. For each TDLUDR[x] output:
The TDLUDR[x] output goes high when the processor is unable to service the
TDLINT[x] request for more data before a specific time-out period. This
period is dependent upon the frequency of TDLCLK:
1) for a TDLCLK frequency of 4 kHz (ESF FDL at the full 4 kHz rate), the
time-out is 1.0 ms;
2) for a TDLCLK frequency of 2 kHz (half the ESF FDL), the time-out is 2.0
ms;
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
39
PMC [ PMC-SIERRA, INC ]
