CS61884 datasheet(39/72 Pages) CIRRUS

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CS61884

DS485PP4

14.18 Line Length Data Register (11h)

14.19 Output Disable Register (12h)

14.20 AIS Status Register (13h)

14.21 AIS Interrupt Enable Register (14h)

BIT

NAME

Description

The value written to the 4-LSBs of this register specifies whether the device is operating in

either T1/J1 or E1 modes and the associated pulse shape as shown below is being transmit-

ted. Register bits default to 00h after power-up or reset.

[7:5]

RSVD

RESERVED (These bits must be set to 0.)

[4]

INT_EXTB

This bit specifies the use of internal (Int_ExtB = 1) or external (Int_ExtB = 0) receiver line

matching. The line impedance for both the receiver and transmitter are chosen through the

LEN [3:0] bits in this register.

[3:0]

LEN[3:0]

These bits setup the line impedance for both the receiver and the transmitter path and the

desired pulse shape for a specific channel. The channel is selected with the Line Length

Channel ID register (0x10). The following table shows the available transmitter pulse

shapes.

LEN [3:0]

Operation

Mode

Line Length Selection

Phase Samples

per UI

0000

120

Ω 3.0V

0001

T1/J1

100

Ω DS1, Option A (undershoot)

0010

T1/J1

100

Ω DS1, Option A (0dB)

0011

T1/J1

100

Ω 0 - 133Ft (0.6dB)

0100

T1/J1

100

Ω 133 - 266Ft (1.2dB)

0101

T1/J1

100

Ω 266 - 399Ft (1.2dB)

0110

T1/J1

100

Ω 399 - 533Ft (2.4dB)

0111

T1/J1

100

Ω 533 - 655Ft (3.0dB)

1000

Ω 2.37V

BIT

NAME

Description

[7:0]

OENB 7-0 Setting bit n of this register to “1” High-Z the TX output driver on channel n of the device.

BIT

NAME

Description

[7:0]

AISS 7-0

A “1” in bit position n indicates that the receiver has detected an AIS condition on channel n,

which generates an interrupt on the INT pin. Register bits default to 00h after power-up or

reset.

BIT

NAME

Description

[7:0]

AISE 7-0

This register enables changes in the AIS Status register to be reflected in the AIS Interrupt

Status register, thus causing an interrupt on the INT pin. Register bits default to 00h after

power-up or reset.

CS61884 Datasheet(PDF) 39 Page - Cirrus Logic

CS61884 Datasheet(HTML) 39 Page - Cirrus Logic

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