PM6344 datasheet(34/256 Pages) PMC

34 / 256 page

STANDARD PRODUCT

PMC-Sierra, Inc.

PM6344 EQUAD

PMC-951013

ISSUE 5

QUADRUPLE E1 FRAMER

Pin Name

Type

Pin No.

Function

BTFP[1]

BTFP[2]

BTFP[3]

BTFP[4]

Input

Backplane Transmit Frame Pulse (BTFP[4:1]). These

inputs are used to frame align the transmitters to the

system backplane. If basic frame alignment only is

required, a pulse at least 1 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 1 BTCLK[x]

cycle every 16 frames. If register bit BTFPREF is set to

logic 1, BTFP[x] becomes the reference frame pulse for

the associated interface.

If frame alignment is not required, BTFP[x] may be tied

to logic high or low.

MTFP

Multiplexed Transmit Frame Pulse (MTFP). MTFP

shares a pin with BTFP[1]. BTFP[4:2] are unused when

the multiplex enable (MENB) input is asserted low.

When the multiplex enable (MENB) input is asserted

low, MTFP indicates the frame alignment of the bit

interleaved PCM and signaling streams in the same way

as BTFP[x]. If basic frame alignment only is required, a

pulse 1 MTCLK cycle wide must be provided on MTFP

at multiples of 2048 clock periods. If multiframe

alignment is required, transmit multiframe alignment

must be enabled, and MTFP must be brought high to

mark bit 1 of frame 1 of the first multiplexed PCM

stream (destined for transmitter number one) of every

16 frame signaling multiframe and brought low following

bit 1 of frame 1 of the first multiplexed PCM stream of

every 16 frame CRC multiframe. This mode allows both

multiframe alignments to be independently controlled

using the single MTFP signal. All four interfaces will

have the same frame alignment. Note that if the

signaling and CRC multiframe alignments are

coincident, MTFP must pulse high for 1 MTCLK cycle

every 16 frames (32768 clock cycles). MTFP is

sampled on the rising edge of MTCLK.

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