PM4354-PI datasheet(35/463 Pages) PMC

35 / 463 page

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

Pin Name

Type

Pin No. Function

BTFP[1]

BTFP[2]

BTFP[3]

BTFP[4]

I/O

H14

N13

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.

BTPCM[1] /

CASBTD

BTPCM[2]

BTPCM[3]

BTPCM[4]

Input

H13

M16

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].

PM4354-PI Datasheet(PDF) 35 Page - PMC-Sierra, Inc

PM4354-PI Datasheet(HTML) 35 Page - PMC-Sierra, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL