6402 datasheet(18/250 Pages) INTEL

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FBD Channel Interface

Intel® 6400/6402 Advanced Memory Buffer Datasheet

2.3.3

Recalibrate State Considerations

In addition to what the FBD Architecture and Protocol specification describes around

Recalibrate State, the AMB further requires that the host be sending NOP commands in

at least the 2 frames preceding the exit from recalibrate state.

Requirement: 2 Cycles before the recalibrate counter expires, NOPs must be sent from

the host.

Recal Frame Counter:54 3

Rx Data:X

XXNOP

NOP

Valid Cmd

where X represents “don’t care” data

Time

Frame Description

Recal Frame

Counter

Sync with ERC bit set

N+1

NOP frame

RECALDUR

N+2

NOP frame

RECALDUR - 1

...

NOP frame

....

N+8

NOP frame

RECALDUR - 7

N+9

NOP frame - host may begin recalibration

RECALDUR - 8

...

.....

....

N + RECALDUR -

NOP frame - host must be finished with recalibration

...

.....

....

N + RECALDUR -

NOP frame

N + RECALDUR -

NOP frame

N + RECALDUR -

NOP frame - must be received at AMB without corruption

N + RECALDUR

NOP frame - must be received at AMB without corruption

Valid Sync Frame

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