PM8313 datasheet(36/192 Pages) PMC

36 / 192 page

PM8313 D3MX

DATA SHEET

PMC-920702

ISSUE 5

M13 MULTIPLEXER

Pin Name

Type

Pin No. Function

TDLSIG/

TDLUDR

I/O

205

The transmit data link (TDLSIG) signal is active

when an external HDLC receiver is selected

(the TEXHDLC bit in the corresponding Master

HDLC Configuration Register is a logic 1). The

TDLSIG signal carries bits to be inserted in the

three C-bits in M-subframe #5 by the DS3

transmitter. TDLSIG is ignored when C-bit

parity mode is not enabled. TDLSIG is

sampled on the rising edge of the TDLCLK

signal.

The transmit data link underrun (TDLUDR)

signal is active when the internal HDLC

receiver is selected (the TEXHDLC bit in the

corresponding Master HDLC Configuration

when the internal HDLC transmitter underruns.

TDLUDR is deasserted by writing to the XFDL

Interrupt Status Register. By default TDLUDR

is an active low open-drain output, but can be

configured as active high.

Upon a reset, the TEXHDLC bit a logic 1, thus,

the pin is configured as an input, TDLSIG.

Typically, TDLUDR would be connected to the

supervising microprocessor when an external

DMA is used, signaling the microprocessor that

a severe error has occurred causing the

transmit buffer to underrun. In this case the

TDLUDR is configured as an active-low open

drain output and wired-ORed with the INTB

output.

PM8313 Datasheet(PDF) 36 Page - PMC-Sierra, Inc