XRT79L71IB datasheet(49/434 Pages) EXAR

49 / 434 page

XRT79L71

REV. 1.0.0

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

BIT NUMBER

NAME

TYPE

DESCRIPTION

Receive UTOPIA Level 3

Enable

R/W

Receive UTOPIA Level 3 Enable:

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

Receive UTOPIA Interface block to operate in either the UTOPIA

Level 1 or 2 or UTOPIA Level 3 Modes, as described below.

0 - Configures the Receive UTOPIA Interface block to operate in

the UTOPIA Level 1 or 2 Mode.

1 - Configures the Receive UTOPIA Interface block to operate in

the UTOPIA Level 3 Mode.

NOTE:

This particular bit-field only configures the Receive

UTOPIA Interface block.

The user must set Bit 7

(UTOPIA Level 3 Enable) within the Transmit UTOPIA

Control Register - Byte 0 (Address = 0x0583) in order to

configure the Transmit UTOPIA Interface block into the

appropriate UTOPIA Level).

Multi-PHY Polling Enable

R/W

Multi-PHY Polling Enable:

This READ/WRITE bit-field permits the user to either enable or

disable Multi-PHY Polling for the Receive UTOPIA Interface

block. If the user implements this feature (and configures the

XRT79L71 to operate in the Multi-PHY Mode) then the RxUClav

output pin will be driven (either "High" or "Low") based upon the

fill-status of the Receive FIFO within the Channel that corre-

sponds to the Receive UTOPIA Address that is currently being

applied to the RxUAddr[4:0] input pins.

If the user does not implement this feature (and then configures

the XRT79L71 to operate in the Single-PHY Mode), then the

RxUClav output pin will unconditionally reflect the Receive FIFO

fill-status for Channel 0. No attention will be paid to the address

values placed upon the RxUAddr[4:0] input pins.

0 - Configures the Receive UTOPIA Interface block to operate in

the Single-PHY Mode.

1 - Configures the Receive UTOPIA Interface block to operate in

the Multi-PHY Mode.

XRT79L71IB Datasheet(PDF) 49 Page - Exar Corporation

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