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STANDARD PRODUCT
PMC-Sierra, Inc.
PM6344 EQUAD
PMC-951013
ISSUE 5
QUADRUPLE E1 FRAMER
65
Register 004H, 084H, 104H, 184H: Transmit Interface Configuration
Bit
Type
Function
Default
Bit 7
R/W
FIFOBYP
0
Bit 6
R/W
TAISEN
0
Bit 5
R/W
TDNINV
0
Bit 4
R/W
TDPINV
0
Bit 3
R/W
TUNI
0
Bit 2
R/W
FIFOFULL
0
Bit 1
R/W
TRISE
0
Bit 0
R/W
TRZ
0
This register enables the Transmit Interface to generate the required digital
output waveform format.
FIFOBYP:
The FIFOBYP bit enables the transmit bipolar input signals to DJAT to be
bypassed around the FIFO to the bipolar outputs. When jitter attenuation is
not being used the DJAT FIFO can be bypassed to reduce the delay through
the transmitter section by typically 24 bits. When FIFOBYP is set to logic 1,
the bipolar inputs to DJAT are routed around the FIFO and directly to the
bipolar outputs. When FIFOBYP is set to logic 0, the bipolar transmit data
passes through the DJAT FIFO.
Note that when FIFOBYP is set to a logic 1, the OCLKSEL1 bit in the
Transmit Timing Options register must also be set to logic 1.
TAISEN:
The TAISEN bit enables the interface to generate an unframed all-ones AIS
alarm on the TDP/TDD[x] and TDN[x] multifunction pins. When TAISEN is set
to logic 1 and TUNI is set to logic 0, the bipolar TDP[x] and TDN[x] outputs
are forced to pulse alternately, creating an all-ones signal; when TAISEN and
TUNI are both set to logic 1, the unipolar TDD[x] output is forced to all-ones.
When TAISEN is set to logic 0, the TDP/TDD[x] and TDN[x] multifunction
outputs operate normally. The transition to transmitting AIS on the TDP[x] and
TDN[x] outputs is done in such a way as to not introduce any bipolar
violations.