PM8313 datasheet(38/192 Pages) PMC

38 / 192 page

PM8313 D3MX

DATA SHEET

PMC-920702

ISSUE 5

M13 MULTIPLEXER

Pin Name

Type

Pin No. Function

TDLEOMI

Input

204

The transmit data link end of message input

(TDLEOMI) provides a method for an external

DMA controller to signal the end of the

transmitted message to the HDLC transmitter

without needing to write to the XFDL

Configuration Register. The TDLEOMI input is

active high and must be glitch-free. It internally

sets the corresponding EOM register bit in the

XFDL Configuration register. The TDLEOMI

input may be asserted during or after the write

of the last byte of a packet but before the next

byte would be expected (within 210 µs of the

last assertion of TDLINT or the INT bit in the

XFDL Status Register). TDLEOMI must be

deasserted before the write of the first byte of

the next packet. TDLEOMI is ignored if no data

transmission is pending.

TICLK

Input

The transmit input clock (TICLK) provides the

transmit direction timing. TICLK is nominally a

44.736 MHz, 50% duty cycle clock. TIMFP is

sampled on the rising edge of TICLK.

TIMFP

Input

208

The transmit M-frame pulse input (TIMFP)

signal allows one to control the alignment of the

M-frame of the transmitted DS3 stream (TDAT).

The first bit (X1) of the M-frame on TDAT will

occur within several TICLK cycles and be

identified by the TMFP output signal. TIMFP

may be tied low if such control is not required.

TIMFP is sampled on the rising edge of TICLK.

TOH

Input

The transmit overhead data (TOH) signal

contains the overhead bits (C, F, X, P, and M)

that may be inserted in the transmitted DS3

stream. TOH is sampled on the rising edge of

TOHCLK.

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