CS61584A datasheet(27/54 Pages) CIRRUS

27 / 54 page

CS61584A

DS261PP5

Factory Test: Must be cleared for normal device

operation.

9.1.4

Control B Registers

The Control B registers are read-write registers and

are shown in Table 8. The Control B registers select

device configuration and loopback control.

TAOS: Controls the transmission of all ones to the

line interface. A TAOS request overrides the data

transmitted to the line interface during local and re-

mote loopbacks.

RLOOP: Controls the remote loopback function for

the channel.

LLOOP1: Controls the local loopback #1 function

for the channel. Includes the jitter attenuator, if en-

abled. In host mode, selecting LLOOP1 and

LLOOP2 simultaneously causes all ones to be out-

put from RPOS/RNEG (RDATA).

LLOOP2: Controls the local loopback #2 function

for the channel. Includes the line driver, line receiv-

er, and jitter attenuator, if enabled. See LLOOP1,

above, for receive all ones function.

CON[3:0]: Controls the configuration of the line

driver, line receiver, coder, and driver tristate as

shown in the Transmitter section. Both channels

must be configured to operate at the same rate (both

T1 or both E1).

9.1.5

Arbitrary Waveform Registers

In addition to the predefined T1 and E1 pulse

shapes, arbitrary pulse shapes may be created dur-

ing Host mode operation using the registers shown

in Table 9. This flexibility can be used to compen-

Control B Register (Channel 1)

Serial Port Address: 0x16; Parallel Port Address: 0xY6

Bit

Description

Definition

Reset

Value

TAOS1

Enable transmit all ones

Disable transmit all ones

RLOOP1

Enable remote loopback

Disable remote loopback

LLOOP11

Enable local loopback #1

Disable local loopback #1

LLOOP21

Enable local loopback #2

Disable local loopback #2

CON31

Line configuration selections

(See Transmitter section)

2CON21

1CON11

0CON01

Control B Register (Channel 2)

Serial Port Address: 0x17; Parallel Port Address: 0xY7

Bit

Description

Definition

Reset

Value

TAOS2

Enable transmit all ones

Disable transmit all ones

RLOOP2

Enable remote loopback

Disable remote loopback

LLOOP12

Enable local loopback #1

Disable local loopback #1

LLOOP22

Enable local loopback #2

Disable local loopback #2

CON32

Line configuration selections

(See Transmitter section)

2CON22

1CON12

0CON02

Table 8. Control B Registers

CS61584A

DS261F1

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