PM8313 datasheet(39/192 Pages) PMC

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PM8313 D3MX

DATA SHEET

PMC-920702

ISSUE 5

M13 MULTIPLEXER

Pin Name

Type

Pin No. Function

TOHEN

Input

The transmit overhead insertion (TOHEN)

signal controls the insertion of DS3 overhead

bits from the TOH input. When TOHEN is high,

the associated overhead bit in the TOH stream

is inserted in the transmitted DS3 frame. When

TOHEN is low, the DS3 overhead bit is

generated and inserted internally. TOHEN is

sampled on the rising edge of TOHCLK.

TOHFP

Output

The transmit overhead frame position (TOHFP)

signal may be used to align the individual

overhead bits in the transmitted overhead data

stream, TOH, to the DS3 M-frame. TOHFP is

high during the X1 overhead bit position in the

TOH stream. TOHFP is updated on the falling

edge of TOHCLK.

TOHCLK

Output

The transmit overhead clock (TOHCLK) cycles

once per overhead bit. TOHCLK is nominally a

526 kHz clock. TOHFP is updated on the falling

edge of TOHCLK. TOH, and TOHEN are

sampled on the rising edge of TOHCLK.

TCLK

Output

The transmit clock (TCLK) provides timing for

circuitry downstream of the DS3 transmitter of

the D3MX. TCLK is nominally a 44.736 MHz,

50% duty cycle clock.

TPOS/

TDAT

Output

The transmit positive pulse (TPOS) signal

represents the positive pulses transmitted on

the B3ZS-encoded line when configured for

dual-rail operation. TPOS is updated on the

falling edge of TCLK by default but may be

enabled to be updated on the rising edge of

TCLK.

The transmit data output (TDAT) signal

represents a unipolar DS3 output stream when

configured for single rail operation. TDAT is

updated on the falling edge of TCLK by default

but may be enabled to be updated on the rising

edge of TCLK.

PM8313 Datasheet(PDF) 39 Page - PMC-Sierra, Inc

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