AM79C978AVCW datasheet(87/256 Pages) AMD

87 / 256 page

Am79C978A

Figure 47.

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 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 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 th e O n No w P a tter n Ma tc h Mode , the

Am79C978A device compares the incoming pack-

ets with up to eight patterns stored in the Pattern

Match RAM (PMR). The stored patterns can be

compared with part or all of incoming packets, de-

pending 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 as-

sert 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 s hown in Figure 48. T he PMR is pro-

grammed 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 possi-

ble when the PMAT_MODE bit is set, and BCR46,

BCR47, and all other bits in BCR45 are ignored.

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

22399A-50

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