AM79C972BVCW datasheet(85/130 Pages) AMD

85 / 130 page

Am79C972

Figure 48.

OnNow Functional Diagram

When the software determines that the signal came

from the PCnet-FAST+ device, it writes to the device’s

PMCSR to put the device into power state D0. The soft-

ware then writes a 0 to the PME_STATUS bit to clear

the bit and turn off the PME signal, and it calls the de-

vice’s software driver to tell it that the device is now in

sta t e D0. T h e sy st em s o ftwar e c an c lea r th e

PME_STATUS bit either before, after, or at the same

time that it puts the device back into the D0 state.

Link Change Detect

Link change detect is one of Wake-up events defined

by the OnNow specification and is supported by the

RWU mode. Link Change Detect mode is set when the

LCMODE bit (CSR116, bit 8) is set either by software

or loaded through the EEPROM.

When this bit is set, any change in the Link status will

cause the LCDET bit (CSR116, bit 9) to be set. When

the LCDET bit is set, the RWU pin will be asserted and

the PME_STATUS bit (PMCSR register, bit 15) will be

set. If either the PME_EN bit (PMCSR, bit 8) or the

PME_EN_OVR bit (CSR116, bit 10) are set, then the

PME will also be asserted.

OnNow Pattern Match Mode

In the OnNow Pattern Match Mode, the PCnet-FAST+

compares the incoming packets with up to eight pat-

terns stored in the Pattern Match RAM (PMR). The

stored patterns can be compared with part or all of in-

coming packets, depending on the pattern length and

the way the PMR is programmed. When a pattern

match has been detected, then PMAT bit (CSR116, bit

7) is set. The setting of the PMAT bit causes the

MPDETECT

MPPEN

MPMODE

MPEN

MPINT

LED

WUMI

Magic Packet

Link Change

LCMODE

Link Change

MPMAT

LCDET

DET

CLR

BCR47

BCR46

BCR45

SET

CLR

SET

CLR

SET

CLR

PMAT

Pattern Match

Input

Pattern

PME_STATUS

Pattern Match RAM (PMR)

PME Status

PME_EN

MPMAT

PME_EN_OVR

LCEVENT

PME

RWU

SET

CLR

POR

H_RESET

POR

21485C-51

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