STANDARD PRODUCT
PM4351 COMET
DATA SHEET
PMC-1970624
ISSUE 10
COMBINED E1/T1 TRANSCEIVER
PROPRIETARY AND CONFIDENTIAL
142
ROHM, BRXSMFP, BRXCMFP:
The ROHM, BRXSMFP and BRXCMFP bits select the output signal seen on
the backplane output BRFP. These register bits only have effect if the
FPMODE bit is a logic 0.
In T1 mode, only BRXSMFP has effect, the other two bits are ignored. When
set to logic 1, the BRFP output pulses high during the first framing bit of the
12 frame SF or the 24 frame ESF (depending on the framing format selected
in the T1-FRMR ). When BRXSMFP is set to logic 0, the BRFP output pulses
high during each framing bit (i.e. every 193 bits).
The following table summarizes the configurations for E1 mode:
Table 23
- E1 Receive Backplane Frame Pulse Configurations
ROHM
BRXSMFP
BRXCMFP
Result
0
0
0
Backplane receive frame pulse output:
BRFP pulses high for 1 BRCLK cycle
during bit 1 of each 256-bit frame,
indicating the frame alignment of the
BRPCM data stream.
Backplane receive CRC multiframe output:
BRFP pulses high for 1 BRCLK cycle
during bit 1 of frame 1 of every 16 frame
CRC multiframe, indicating the CRC
multiframe alignment of the BRPCM data
stream. (Even when CRC multiframing is
disabled, the BRFP output continues to
indicate the position of bit 1 of the FAS
frame every 16
th
frame).
Backplane receive signaling multiframe
output:
BRFP pulses high for 1 BRCLK cycle
during bit 1 of frame 1 of the 16 frame
signaling multiframe, indicating the
signaling multiframe alignment of the
BRPCM data stream. (Even when
signaling multiframing is disabled, the
BRFP output continues to indicate the
position of bit 1 of every 16
th
frame.)
0
0
1
0
1
0