PM4354 Datasheet, PDF (35/463 Pages) PMC-Sierra, Inc – Four Channel Combined E1/T1/J1 Transceiver/Framer

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PM4354 COMET-QUAD
DATASHEET
PMC-1990315
ISSUE 6
FOUR CHANNEL COMBINED E1/T1/J1
TRANSCEIVER / FRAMER
Pin Name Type Pin No. Function
BTFP[1]
BTFP[2]
BTFP[3]
BTFP[4]
I/O H4
H14
M1
N13
BTPCM[1] / Input F4
CASBTD
BTPCM[2]
H13
BTPCM[3]
M4
BTPCM[4]
M16
Backplane Transmit Frame Pulse (BTFP[1:4]). When BTFP[x] is
configured as an input, and may be used to frame align the transmitters to
the system backplane.
T1 mode:
If only frame alignment is required, a pulse at least one BTCLK[x] cycle wide
must be provided on BTFP[x] at multiples of 193 bit periods. If superframe
alignment is required, transmit superframe alignment must be enabled, and
BTFP[x] must be brought high for at least one BTCLK[x] cycle to mark bit 1
of frame 1 of every 12-frame or 24-frame superframe.
E1 mode:
If basic frame alignment only is required, a pulse at least one BTCLK[x] cycle
wide must be provided on BTFP[x] at multiples of 256 bit periods. If
multiframe alignment is required, transmit multiframe alignment must be
enabled, and BTFP[x] must be brought high to mark bit 1 of frame 1 of every
16-frame signaling multiframe and brought low following bit 1 of frame 1 of
every 16-frame CRC multiframe. This mode allows both multiframe
alignments to be independently controlled using the single BTFP[x] signal.
Note that if the signaling and CRC multiframe alignments are coincident,
BTFP[x] must pulse high for one BTCLK[x] cycle every 16 frames.
When BTFP[x] is configured as an output (only valid when the transmit
backplane clock rate is no greater than 2.048 MHz), transmit frame
alignment is derived internally, and BTFP[x] is updated on the active edge of
BTCLK[x]. BTFP[x] pulses high for one cycle to indicate the first bit of each
frame or multiframe, as optioned.
When in Transmit Clock Slave: H-MVIP mode, BTFP[x] is configured as an
input and is unused. In this mode, it is recommended that BTFP[x] be
connected via an external resistor to ground.
After a reset, BTFP[x] is configured as an input.
Backplane Transmit Data (BTPCM[1:4]). The non-return to zero, digital
backplane transmit data streams to be transmitted are input on these pins.
BTPCM[x] may present a 1.544 Mbit/s, 2.048 Mbit/s or sub-rate Nx64Kbit/s
data stream. BTPCM[x] is sampled on the active edge of BTCLK[x].
BTPCM[2:4] are unused in Transmit Clock Slave: H-MVIP mode. BTPCM[1]
shares the same pin as the Transmit Clock Slave: H-MVIP Channel
Associated Signaling pin, CASBTD. By default this input is BTPCM[1].
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC. AND FOR ITS CUSTOMERS’ INTERNAL USE
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