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STANDARD PRODUCT
PM4351 COMET
DATA SHEET
PMC-1970624
ISSUE 10
COMBINED E1/T1 TRANSCEIVER
PROPRIETARY AND CONFIDENTIAL
225
The INVERT and SIGNINV can be used to produce the following types of
inversions:
Table 45
- TPSC Transmit Data Conditioning
INVERT
SIGNINV
Effect on PCM Channel Data
0
1
0
0
0
1
PCM Channel data is unchanged
All 8 bits of the PCM channel data are inverted
Only the MSB of the PCM channel data is inverted
(SIGN bit inversion)
All bits EXCEPT the MSB of the PCM channel data
is inverted (Magnitude inversion)
1
1
DMW:
When the DMW bit is set to a logic 1, the digital milliwatt pattern replaces the
BTPCM input data for the duration of that channel.
The DMW bit only has effect in T1 mode.
TEST:
When the TEST bit is set to a logic 1, channel data from the BTPCM input is
either overwritten with a test pattern from the PRGD block or is routed to the
PRGD block and compared against an expected test pattern. The
RXPATGEN bit in the Pattern Generator/Detector Positioning/Control register
determines whether the transmit data is overwritten or compared as shown in
the following table:
Table 46
- Transmit Test Pattern Modes
TEST
RXPATGEN
Description
0
1
X
1
Channel data is not included in test pattern
Channel data is routed to PRGD and compared against
expected test pattern
Channel data is overwritten with PRGD test pattern
1
0
All the channels that are routed to the PRGD are concatenated and treated
as a continuous stream in which pseudorandom are searched for. Similarly,
all channels set to be overwritten with PRGD test pattern data are treated
such that if the channels are subsequently extracted and concatenated, the
PRBS appears in the concatenated stream. Pattern generation/detection can