6402 datasheet(81/250 Pages) INTEL

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Intel® 6400/6402 Advanced Memory Buffer Datasheet

SMBus Interface

7.1.4

SMBus Error Handling

The SMBus slave interface handles two types of errors: internal and PEC. These errors

manifest as a Not-Acknowledge (NACK) for the read command (End bit is set). If an

internal error occurs during a configuration write, the final write command receives a

NACK just before the stop bit. If the master receives a NACK, the entire configuration

transaction should be reattempted.

If the master supports packet error checking (PEC) and the PEC_en bit in the command

is set, then the PEC byte is checked in the slave interface. If the check indicates a

failure, then the slave will NACK the PEC packet.

7.1.5

SMBus Resets

7.1.5.1

SMBus Transactions During FBD Link Fast Reset

When the FBD link transitions into Electrical Idle (disable state) from an active state,

this causes a “fast” reset of all non-sticky registers in the AMB. SMB transactions

underway during a “fast” reset will not complete normally.

Figure 7-4. SMBus Configuration Double Word Write (Write Bytes, PEC Enabled)

Figure 7-5. SMBus Configuration Word Write (Block Write, PEC Disabled)

Figure 7-6. SMBus Configuration Byte Write (Write Bytes, PEC Disabled)

X01 1 _XXX

W A

C m d = 10011100

Rese rve d

PEC

X01 1 _XXX

W A

C m d = 00011100

D evice/F u n ction

PEC

X01 1 _XXX

W A

C m d = 00011100

R e gister[15:8]

PEC

X01 1 _XXX

W A

C m d = 01011100

D ata[7 :0 ]

PEC

X01 1 _XXX

W A

C m d = 00011100

D a ta [31:24]

PEC

X01 1 _XXX

W A

C m d = 00011100

D a ta [23:16]

PEC

X01 1 _XXX

W A

C m d = 00011100

D ata [15:8]

PEC

X01 1 _XXX

W A

C m d = 00011100

R e g ister[7 :0 ]

PEC

X011_XXX

Cmd = 11001010

Byte Count =6

Reserved

Device/Function

Reg Number[15:8]

Reg Number [7:0]

Data[16:8]

Data[7:0]

A P

X011_X X X

W A

C m d = 10000100

Reserved

X011_X X X

W A

C m d = 00000100

D evice/Function

X011_X X X

W A

C m d = 00000100

R egister[15:8]

X011_X X X

W A

C m d = 01000100

D ata[7:0]

X 011_X X X

W A

C m d = 00000100

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