DP83266 datasheet(108/152 Pages) NSC

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70 Control Information (Continued)

Indicate Attention Register (IAR)

The Indicate Attention Register (IAR) is used to present exception and breakpoint attentions generated by each Indicate

Channel An Attention bit is set by hardware when an exception or breakpoint occurs on the corresponding Indicate Channel

Each bit may be enabled by setting the corresponding bit in the Indicate Notify Register

All bits in this register are set to Zero upon reset

Access Rules

Address

Read

Write

114h

Always

Conditional

RES

EXCI0

BRKI0

EXCI1

BRKI1

EXCI2

BRKI2

Bit

Symbol

Description

BRKI2

Breakpoint on ICHN2

This bit is set when a breakpoint is detected on Indicate Channel 2 No action is

taken if the host sets this bit

EXCI2

Exception on ICHN2

While this bit is set copying is disabled on ICHN2 This bit is set by the MACSI

device when an exception occurs on Indicate Channel 2 An exception consists of an ABus error during an

IDU or IDUD write for ICNH2 It may be set by the host to disable copying on ICHN2 which is convenient

when updating the Indicate Header Length and Indicate Threshold register

When this bit is set by the device it signifies that the last frame received on this channel had an ABus

error It is the last frame because the setting of this bit disables further copying on this channel The last

frame should be discarded

BRKI1

Breakpoint on ICHN1

This bit is set when a breakpoint is detected on Indicate Channel 1 No action is

taken if the host sets this bit

EXCI1

Exception on ICHN1

While this bit is set copying is disabled on ICHN1 This bit is set by the MACSI

device when an exception occurs on Indicate Channel 1 An exception consists of an ABus error during an

IDU or IDUD write for ICNH1 It may be set by the host to disable copying on ICHN1 which is convenient

when updating the Indicate Header Length and Indicate Threshold register

When this bit is set by the device it signifies that the last frame received on this channel had an ABus

error It is the last frame because the setting of this bit disables further copying on this channel The last

frame should be discarded

BRKI0

Breakpoint on ICHN0

This bit is set when a breakpoint is detected on ICHN0 No action is taken if the

host sets this bit The User must set IMCRBOS to use the BRKI0 breakpoint

EXCI0

Exception on ICHN0

While this bit is set copying is disabled on ICHN0 This bit is set by the MACSI

device when an exception occurs on Indicate Channel 0 An exception consists of an ABus error during an

IDU or IDUD write for ICNH0 It may be set by the host to disable copying on ICHN0

When this bit is set by the device it signifies that the last frame received on this channel had an ABus

error It is the last frame because the setting of this bit disables further copying on this channel The last

frame should be discarded

D7 – D6

RES

Reserved

108

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