DP83261AVF datasheet(78/132 Pages) NSC

78 / 132 page

70 Signal Descriptions (Continued)

7322 PDU Sequencing

The PDU Sequencing signals apply to the data and status available at the MAC Indicate Interface They are used to determine

the validity of the data (MID7 – 0) and parity (MIP) In addition the sequencing signals are used to determine the validity of the

Addressing Flags and the Frame Status such as the Control Indicators All timing is explained relative to the byte present on the

MAC Indicate Interface

Symbol

Description

RCSTART

Receive Start

Indicates that a MAC PDU Starting Delimiter has been received It is asserted when

the Starting Delimiter is present at the MAC Indicate Interface

FCRCVD

Frame Control Received

Indicates that the Frame Control field is present It is asserted when the

Frame Control field is present at the MAC Indicate Interface

DARCVD

Destination Address Received

Indicates that the Destination Address has been received It is

asserted on the last byte of the Destination Address and remains asserted until the next PDU Starting

Delimiter is received

SARCVD

Source Address Received

Indicates that the Source Address has been received It is asserted on

the last byte of the Source Address and remains asserted until the next PDU Starting Delimiter is

received

INFORCVD

Information Field Received

Indicates that four bytes of the Information field have been received It

is asserted on the fourth byte of the INFO field and remains active until the next PDU Starting

Delimiter is received

DP83261AVF Datasheet(PDF) 78 Page - National Semiconductor (TI)