PM73121ꢀAAL1gator II
Data Sheet
PMC-Sierra, Inc.
PMC-980620
,VVXHꢀꢁ
AAL1 SAR Processor
Figure 41 shows the contents of the receive data buffer for lines in the UDF-ML or UDF-HS
mode, including T1 unstructured mode. In unstructured modes, each frame buffer contains 256
bits. In the case of unstructured T1, each frame of T1 data consists of 192 bits. Therefore, each
frame buffer contains 1.33 frames of T1 data. This must be considered when determining CDVT
numbers.
Data Bits
Frame Buffer Number
0
255
0
256 bits
256 bits
256 bits
1
2
256 bits
511
Figure 41. Unstructured Format of the R_DATA_BUFFER
Figure 42 shows the contents of the receive signaling buffer with an ESF-formatted T1 line in the
SDF-MF mode. Even channel bytes are stored in the low-byte end of the data words.
Byte Address
31
0
Channel 24
Not Used
Channel 31
Not Used
Channel 23
ABCD
Channel 22
ABCD
Channel 1
ABCD
Channel 0
ABCD
0
1
2
3
Multiframe
15
Figure 42. T1 ESF SDF-MF Format of the R_SIG_BUFFER
ꢄꢆ
PMC [ PMC-SIERRA, INC ]
