XRT79L71IB datasheet(71/434 Pages) EXAR

71 / 434 page

XRT79L71

REV. 1.0.0

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

Transmit POS-PHY Interface - Transmit Control Register Byte - 0 (Address = 0x0582)

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

Runt Packet

ABORT

Parity Check

Enable

ODD Parity

Transmit_PO

S_PHY_Add

r[4:0]

R/W

BIT NUMBER

NAME

TYPE

DESCRIPTION

Runt Packet ABORT

R/W

Runt Packet ABORT:

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

disable the RUNT Packet Abort feature.

If the user enables this feature, then anytime the Transmit POS-

PHY Interface block receives a RUNT packet from the Link

Layer Processor, this packet will be transmitted to the remote

terminal as an Aborted Packet.

NOTE: An example of a RUNT packet being accepted by the

Transmit POS-PHY Interface block is whenever the Link

Layer Processor asserts the TxPSoP [Start of Packet)

indicator multiple times without asserting the TxPEOP

(End of Packet) indicator.

0 - Disables the RUNT Packet Abort feature.

1 - Enables the RUNT Packet Abort feature.

Parity Check Enable

R/W

Parity Check Enable

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

disable parity checking of all data that is accepted by the Trans-

mit POS-PHY Interface.

If the user enables this feature, then the XRT79L71 will compute

either the EVEN or ODD parity value (depending upon the set-

ting of Bit 5, within this register) of each byte or word that is

accepted by the Transmit POS-PHY Interface - Data Bus. The

Transmit POS-PHY Interface block will then compare this locally

calculated parity value with the state of the TxPPrty input pin.

If these two values match, then the Transmit POS-PHY Interface

block will presume that it has accepted PPP data from the Link

Layer Processor in an un-erred manner. Conversely, if these

two values do not match, then the Transmit POS-PHY Interface

block will presume that it has accepted PPP data from the Link

Layer Processor in an erred manner and it will transmit this PPP

Packet as an Aborted Packet.

0 - Disables Parity Checking via the Transmit POS-PHY Inter-

face.

1 - Enables Parity Checking via the Transmit POS-PHY Inter-

face.

XRT79L71IB Datasheet(PDF) 71 Page - Exar Corporation

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