AM79C978 datasheet(88/261 Pages) AMD

88 / 261 page

Am79C978

Figure 46.

OnNow Functional Diagram

Link Change Detect

Link change detect is one of wake-up events defined

by the OnNow specification. Link Change Detect mode

is set when the LCMODE bit (CSR116, bit 8) is set ei-

ther 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 PME_STATUS bit (PMCSR

(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 Am79C978 de-

vice compares the incoming packets with up to eight

patterns 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

PME_STATUS bit (PMCSR, bit 15) to be set, which in

turn will assert the PME pin if the PME_EN bit

(PMCSR, bit 8) is set.

Pattern Match RAM (PMR)

PMR is organized as an array of 64 words by 40 bits as

shown in Figure 47. The PMR is programmed indirectly

through BCRs 45, 46, and 47. When BCR45 is written

and the PMAT_MODE bit (BCR45, bit 7) is set to 1,

Pattern Match logic is enabled. No bus accesses into

the PMR are possible when the PMAT_MODE bit is

set, and BCR46, BCR47, and all other bits in BCR45

are ignored. When PMAT_MODE is set, a read of

BCR 45 r e tur n s all bits und efin ed ex ce pt for

MPDETECT

MPPEN

MPMODE

MPEN

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

SET

CLR

POR

H_RESET

POR

22206B-50

AM79C978 Datasheet(PDF) 88 Page - Advanced Micro Devices

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