XRT79L71IB datasheet(91/441 Pages) EXAR

91 / 441 page

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PRELIMINARY

XRT79L71

1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

REV. P1.0.3

OPERATION CONTROL REGISTER - BYTE 0 (ADDRESS = 0X0103)

BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0

Transmit

UTOPIA

PLL OFF

Receive

UTOPIA

PLL OFF

Reserved

PPP/ATM*

Reserved

Software

RESET*

R/W

0000

000

BIT NUMBER

NAME

TYPE

DESCRIPTION

Transmit UTOPIA PLL

OFF

R/W

Receive UTOPIA PLL

OFF

R/W

5 - 3

Unused

R/O

PPP/ATM*

R/W

PPP/ATM UNI Mode Select:

This READ-WRITE bit-field permits the user to configure the

XRT79L71 device to operate in either the ATM UNI or PPP

Mode.

If Bit 3 (Dual Bus), within the "Operation Control Register - Byte

3" is set to "0", then this bit-field will then dictate the operating

mode of the XRT79L71 device.

0 - Configures the "Dedicated" UTOPIA/POS-PHY bus to oper-

ate in the UTOPIA (ATM) Mode.

1 - Configures the "Dedicated" UTOPIA/POS-PHY Bus to oper-

ate in the POS-PHY Mode.

NOTE:

This bit-field is ignored if Bit 3 (Dual-Bus) within the

"Operation Control Register - Byte 3" is set to "1".

Reserved

R/O

Software RESET

R/W

Software RESET:

This READ-WRITE bit-field permits the user to reset the

XRT79L71 device.

0 - Configure the XRT79L71 device into RESET mode.

1 - Normal operation.

DEVICE ID REGISTER (ADDRESS = 0X0104)

BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0

DEVICE_ID_VALUE [7:0]

R/O

1111

010

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