DP83261AVF datasheet(79/132 Pages) NSC

79 / 132 page

70 Signal Descriptions (Continued)

7323 PDU Flags

The PDU flags may be used with the received Frame Control field to determine if an attempt should be made to copy the frame

Symbol

Description

AFLAG

My Destination Address Recognized

Indicates that an internal address match occurred on the

Destination Address field The internal address (MSA MLA GSA GLA) match is indicated by the

assertion of FCSL and DAIG AFLAG is asserted along with DARCVD It is reset when the next PDU

Starting Delimiter is received

DAIG

IndividualGroup Address Flag

Indicates the address type Valid on the first byte of the Destination

Address

0 Individual Address

1 Group Address

FCSL

ShortLong Address Flag

Indicates the size of the Destination Address Signal is valid when

FCRCVD is asserted

0 Short Address

1 Long Address

Used in conjunction with TKRCVD to indicate the type of token received

0 Non-restricted token

1 Restricted token

MFLAG

My Source Address Recognized

Indicates that the received Source Address field matched the

MLA or MSA SAIG is ignored in the comparison MFLAG is asserted along with SARCVD It is reset

when the next PDU Starting Delimiter is received

SAMESA

Same Source Address

Indicates three conditions

1 The Source Address of the current frame is the same as the Source Address of the previous frame

AND

2 The current and previous frames were not MAC frames AND

3 The current and previous frames have the same address field size

SAMESA is asserted along with SARCVD It is reset when the next PDU starting delimiter is received

SAMEINFO

Same MAC Information

Indicates two conditions

1 The first 4 bytes of the information field of the current frame are identical to the first 4 bytes of the

previous non-Void frame AND

2 The current and previous non-Void frames were MAC frames

SAMEINFO is asserted along with INFORCVD It is reset when the next PDU Starting Delimiter is

received

Note that the FC field is not checked to insure that it is the same as in the previous frame This

includes the address size comparison

In REV1 of the BMAC Device Void frames are not ignored as stated in 1 and 2 above

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