CS61581 datasheet(20/37 Pages) CIRRUS

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CS61581

DS211PP8

2.15

Control Register 2 LH: Address 0x11

AIS

Alarm Indication Signal.

AIS = 1 when an all ones pattern is present at the receiver. This bit is reset to “0” by the first

read occurring after the AIS condition has cleared.

An interrupt will occur when AIS is present unless a “1” is written to AIS disabling the interrupt.

RAMPLSE

When RAMPLSE = 1, output pulse shapes are determined by the codes in the internal, pro-

grammable, transmit RAM.

MATCHZ

Matched Impedance Drive

When MATCHZ = 1 the output impedance is automatically set to match the impedance of a

standard T1 or E1 line.

A 1:1.5 transformer should be used when MATCHZ = 1, and a 1:2 transformer should be used

when MATCHZ = 0. (See Figures 15 and 16.)

LOOPDN

Loop Down

In Long Haul mode, setting LOOPDN to “1” causes the data pattern 001001... to be repetitively

transmitted.

LOOPUP

Loop Up

InLongHaulmode,settingLOOPUPto“1”causesthedatapattern0000100001...toberepetitively

transmitted.

RPWDN

Receiver Power Down

When RPWDN = 1, the receiver circuitry is powered down, but the transmitter is still active.

TxHIZ

Transmitter High Impedance

When TxHIZ = 1 the transmitter goes to a low-power, high-impedance state

SH/LH

Short Haul / Long Haul Select

When SH/LH = 0, the CS61581 is in the Long Haul mode.

When SH/LH = 1, the CS61581 is in the Short Haul mode. Note that it overwrites the E1_LH bit,

if set.

SH/LH controls the functions of the bits in Control Register 1 (address 0x10) and Control Reg-

ister 2 (address 0x11).

7 (MSB)

0 (LSB)

AIS

RAMPLSE

MATCHZ

LOOPDN

LOOPUP

RPWDN

TxHIZ

SH/LH

CS61581

DS211F1

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