DP83255AVF datasheet(90/96 Pages) NSC

90 / 96 page

80 Detailed Descriptions (Continued)

TABLE 8-1 Abreviations used in

the Repeat Filter State Diagram

IDLE

Force IdleTrue when not in Active

Transmit Mode

Represents the symbols R or S or T

TPARITY

Parity error

Data symbols (for C e 0 in the PHY-MAC

Interface)

Data portion of a control and data symbol

mixture

Any symbol (ie don’t care)

Violation symbols or symbols inserted by

the Receiver Block

Idle symbols or symbols inserted by the

Receiver Block

ALSZILSZ

Active Line State or Idle Line State (ie

PHY Invalid)

ALSZILSZ Not in Active Line State nor in Idle Line

State (ie PHY Valid)

Halt symbol

Reset symbol

Set symbol

Frame ending delimiter

Frame start delimiter

Idle symbol (Preamble)

Code violations

The Repeat Filter complies with the FDDI standard by ob-

serving the following

1 In Repeat State violations cause transitions to the Halt

State and two Halt symbol pairs are transmitted (unless

JK or Ix occurs) followed by transition to the Idle State

2 When Ix is encountered the Repeat Filter goes to the Idle

State during which Idle symbol pairs are transmitted until

a JK is encountered

3 The Repeat Filter goes to the Repeat State following a JK

from any state

The END State which is not part of the FDDI standard

allows an R or S prior to a T within a frame to be recognized

as a violation It also allows NT to end a frame as opposed

to being treated as a violation

DP83255AVF Datasheet(PDF) 90 Page - National Semiconductor (TI)

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