PM7346 datasheet(49/419 Pages) PMC

49 / 419 page

PM7346 S/UNI-QJET

DATASHEET

PMC-960835

ISSUE 6

SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3

PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND ITS CUSTOMERS’ INTERNAL USE 28

Pin Name

Type

Pin No.

Function

TOHFP[4]

TOHFP[3]

TOHFP[2]

TOHFP[1]

Output

Transmit DS3/E3/J2 Overhead Frame

Position (TOHFP[4:1]). TOHFP[4:1] is

used to align the individual overhead bits

in the transmit overhead data stream,

TOH[4:1], to the DS3 M-frame or the E3

frame. For DS3, TOHFP[4:1] is high

during the X1 overhead bit position in the

TOH[4:1] stream. For G.832 E3,

TOHFP[4:1] is high during the first bit of

the FA1 byte. For G.751 E3, TOHFP[4:1]

is high during the RAI overhead bit

position in the TOH[4:1] stream. For J2,

TOHFP[4:1] is high during the first bit of

timeslot 97 in the first frame of a 4-frame

multiframe). TOHFP[4:1] is updated on the

falling edge of TOHCLK[4:1].

TOHCLK[4]

TOHCLK[3]

TOHCLK[2]

TOHCLK[1]

Output

Transmit DS3/E3/J2 Overhead Clock

(TOHCLK[4:1]). TOHCLK[4:1] is active

when a DS3, E3, or J2 stream is being

processed. TOHCLK[4:1] is nominally a

526 kHz clock for DS3, a 1.072 MHz clock

for G.832 E3, a 1.074 MHz clock for G.751

E3, and a gapped 6.312 MHz clock with

an average frequency of 168 kHz for J2.

TOHFP[4:1] is updated on the falling edge

of TOHCLK[4:1]. TOH[4:1], and

TOHINS[4:1] are sampled on the rising

edge of TOHCLK[4:1].

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