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RELEASED
PM4354 COMET-QUAD
DATASHEET
PMC-1990315
ISSUE 6
FOUR CHANNEL COMBINED E1/T1/J1
TRANSCEIVER / FRAMER
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC. AND FOR ITS CUSTOMERS’ INTERNAL USE
78
When the COMET-QUAD quadrant is in a loss of signal state, the RSYNC output is derived
from XCLK. When the COMET-QUAD quadrant is not in a loss of signal state, the RSYNC
output is derived from the receive recovered clock of the selected quadrant.
The quadrant becoming the source of RSYNC is configured in the RSYNC Select register.
IBCD_IDLE:
When the IBCD_IDLE bit is set to logic 1, the data to the inband code detector (IBCD) block is
gapped during the framing bit. This allows the IBCD to be used to detect an idle code that is
inserted only in the payload of the receive DS1 PCM stream. The IBCD must still be
programmed to detect the desired pattern, and otherwise operates unchanged. The
IBCD_IDLE bit is only valid in T1 mode.
TRKEN:
The TRKEN bit enables quadrant receive trunk conditioning upon an out of frame condition. If
TRKEN is logic 1, the contents of the RX-ELST Idle Code register are inserted into all data
timeslots (including TS0 and TS16) of BRPCM[x] or MVBRD of the quadrant if the framer is
out-of-basic frame (i.e. the OOF status bit is logic 1). The TRKEN bit only has effect if
RXELSTBYP bit is logic 0. If TRKEN is a logic 0, receive trunk conditioning can still be
performed on a per-timeslot basis via the RPSC Data Trunk Conditioning and Signaling Trunk
Conditioning registers.
RXMTKC:
The RXMTKC bit allows quadrant trunk conditioning to be applied to the received data and
signaling streams, BRPCM[x] or MVBRD, and BRSIG[x] or CASBRD, of the quadrant. When
RXMTKC is set to logic 1, the data on BRPCM[x] or MVBRD for each channel of the quadrant
is replaced with the data contained in the data trunk conditioning registers within RPSC;
similarly, the signaling on BRSIG[x] or CASBRD for each channel of the quadrant is replaced
with the signaling contained in the signaling trunk conditioning registers. When RXMTKC is
set to logic 0, the data and signaling streams are modified on a per-channel basis in
accordance with the control bits contained in the per-channel control registers within the
RPSC.
E1/T1B:
The global E1/T1B bit selects the operating mode of all four of the COMET-QUAD quadrants.
If E1/T1B is logic 1, the 2.048 Mbit/s E1 mode is selected for all four quadrants. If E1/T1B is
logic 0, the 1.544 Mbit/s T1 mode is selected for all four quadrants.
E1/T1B is only defined for Register 000H. In Registers 100H, 200H, and 300H the bit is
unused, and the Default value is ‘X’.