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RELEASED
PM73122 AAL1GATOR-32
DATASHEET
PMC-1981419
ISSUE 7
32 LINK CES/DBCES AAL1 SAR PROCESSOR
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
131
format. The RFTC generally ignores the multiframe pulses that occur on the 12
th
frame in the multiframe.
A special case of E1 mode exists that permits the use of T1 signaling with E1
framing. Normally an E1 multiframe consists of 16 frames of 32 timeslots, where
signaling changes on multiframe boundaries. When E1_WITH_T1_SIG is set in
LIN_STR_MODE and the line is in E1 mode, the TFTC will use a multiframe
consisting of 24 frames of 32 timeslots.
If GEN_SYNC is set in the LIN_STR_MODE memory register for this line then
the RFTC will generate the frame pulses based on its internal counter.
The signaling nibble is valid for each channel when the last nibble of each
channel’s data is being driven unless the SHIFT_CAS bit is set in the
LIN_STR_MODE register. If the SHIFT_CAS bit is set the signaling nibble is
valid for each channel when the first channel of each channel’s data is being
driven. See Figure 55 for an example of signaling bits in a T1 frame. See Figure
56 for an example of signaling bits in the E1 mode.
Figure 55 Output of T1 Signaling Bits (SHIFT_CAS=0)
Channel 0
Channel 1
ABCD
Channel 21
Channel 22
Channel 23
...
...
...
Line Output Signals During Every Frame
0
1
2
21
22
23
XXXX - indicates signaling is invalid
XXXX
XXXX
XXXX
TL_SER
(timeslots
)
TL_SIG
Figure 56 Output of E1 Signaling Bits (SHIFT_CAS=0)
Channel 0
Channel 1
ABCD
Channel 29
Channel 30
Channel 31
...
...
...
0
1
2
29
30
31
XXXX - indicates signaling is invalid
XXXX
XXXX
XXXX
TL_SER
(timeslots
)
TL_SIG
Line Output Signals During Every Frame
Note:
The AAL1gator-32 treats all 32 timeslots identically. Although E1 data streams
contain 30 timeslots of channel data and 2 timeslots of control (timeslots 0