XRT79L71IB datasheet(61/434 Pages) EXAR

61 / 434 page

XRT79L71

REV. 1.0.0

1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - REGISTER/MAP DESCRIPTION

TRANSMIT UTOPIA INTERFACE BLOCK - ATM UNI APPLICATIONS

This section presents the Register Description/Address Map of the control registers associated with the

Transmit UTOPIA Interface blocks for ATM UNI Applications. The Register Description/Address Map of these

control registers for PPP Applications will be presented in the next section.

TABLE 3: TRANSMIT UTOPIA INTERFACE BLOCK - REGISTER/ADDRESS MAP - ATM UNI APPLICATIONS

ADDRESS LOCATION

TYPE

DEFAULT

VALUE

TRANSMIT UTOPIA INTERFACE CONTROL REGISTERS

00x580

Reserved

R/O

0x00

0x0581

Transmit UTOPIA Interface - Transmit Control Register - Byte 2

R/W

0x38

0x0582

Transmit UTOPIA Interface - Transmit Control Register - Byte 1

R/W

0x00

0x0583

Transmit UTOPIA Interface - Transmit Control Register - Byte 0

R/W

0x00

0x0584 - 0x0592

Reserved

R/O

0x00

0x0593

Transmit UTOPIA Interface - Port Address Register

R/W

0x00

0x0594 - 0x0596

Reserved

R/O

0x00

0x0597

Transmit UTOPIA Interface - Port Number Register

R/W

0x00

0x0598 - 0x10FF

Reserved

R/O

0x00

Transmit UTOPIA Interface - Transmit Control Register - Byte 0 (Address = 0x0583)

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

Transmit

UTOPIA

Level 3

Enable

Multi-PHY

Polling

Enable

Back to Back

Polling

Enable

Direct Sta-

tus Indication

Enable

Transmit UTOPIA Data Bus

Width

Cell Size[1:0]

R/W

BIT NUMBER

NAME

TYPE

DESCRIPTION

Transmit UTOPIA Level 3

Enable

R/W

Transmit UTOPIA Level 3 Enable:

This READ/WRITE bit-field configures the Transmit UTOPIA

Interface block to operate in either the UTOPIA Level 1 or 2 or

UTOPIA Level 3 Mode as described below.

0 - Configures the Transmit UTOPIA Interface block to operate in

the UTOPIA Level 1 or 2 Mode.

1 - Configures the Transmit UTOPIA Interface block to operate in

the UTOPIA Level 3 Mode.

NOTE:

This particular bit-field only configures the Transmit

UTOPIA Interface block.

The user must set Bit 7

(UTOPIA Level 3 Enable) within the Receive UTOPIA

Control Register - Byte 0 (Address = 0x0503) in order to

configure the Receive UTOPIA Interface block into the

appropriate UTOPIA Level).

XRT79L71IB Datasheet(PDF) 61 Page - Exar Corporation

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