PM4341AT1XC
DATA SHEET
PMC-900602
ISSUE 7
T1 FRAMER/TRANSCEIVER
3. Inputs RSTB and ALE have integral pull-up resistors.
4. Pins 1,19,20,21,39,40,41,59,60,61,79, and 80 on the 80-pin PQFP are not
connected. These pins should be left unconnected in any application.
5. The TDLSIG/TDLINT pin has an integral pull-up resistor and defaults to being
an input after a reset.
6. When the internal RFDL is enabled, the RDLINT output goes high:
• when the number of bytes specified in the RFDL Interrupt
Status/Control Register have been received on the data link,
• immediately on detection of RFDL FIFO buffer overrun,
• immediately on detection of end of message,
• immediately on detection of an abort condition, or,
• immediately on detection of the transition from receiving all ones to
flags.
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 T1XC 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 output goes high:
• immediately on detection of RFDL FIFO buffer overrun,
• when the data byte written into the RFDL FIFO buffer due to an end
of message condition is read,
• when the data byte written into the RFDL FIFO buffer due to an
abort condition is read, or,
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
34
PMC [ PMC-SIERRA, INC ]
