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B.17 Block Write Command and Response

B.18 Block Read Command and Response

Block Write Command and Response

USB PACKET

COMMAND

BYTE 0

USB PACKET USB PACKET

USB PACKET USB PACKET USB PACKET

USB PACKET

COMMENTS

DESCRIPTION

COMMAND

BYTE 1

BYTE 2

BYTE 3

BYTE 4

BYTE 5

BYTES 6–63

CODE

C number of bytes (from 1 up to 32 bytes) to

Block Write

0x08

write

USB PACKET

COMMAND

BYTE 0

USB PACKET USB PACKET

USB PACKET USB PACKET USB PACKET

USB PACKET

COMMENTS

DESCRIPTION

COMMAND

BYTE 1

BYTE 2

BYTE 3

BYTE 4

BYTE 5

BYTES 6–63

CODE

Response from

Success: 0

0x88

Block Write

Fail: 1

The following describes the detailed bit banking of the Block Write command (with PEC on):

PMBUS/SMBUS start

→ write A (= slave address shifted left by 1 bit + write bit of 0) → slave ACK

→ write B (a command byte defined by PMBUS or SMBUS) → slave ACK → write C (number of

bytes to write to slave)

→ slave ACK → repeat (write next byte → slave ACK) for C number of times

→ write PEC byte → slave ACK → PMBUS/SMBUS stop

USB PACKET

COMMAND

BYTE 0

USB PACKET USB PACKET

USB PACKET USB PACKET USB PACKET

USB PACKET

COMMENTS

DESCRIPTION

COMMAND

BYTE 1

BYTE 2

BYTE 3

BYTE 4

BYTE 5

BYTES 6–63

CODE

Block Read

0x09

USB PACKET

COMMAND

BYTE 0

USB PACKET USB PACKET

USB PACKET USB PACKET USB PACKET

USB PACKET

COMMENTS

DESCRIPTION

COMMAND

BYTE 1

BYTE 2

BYTE 3

BYTE 4

BYTE 5

BYTES 6–63

CODE

Response from

Success: 0

0x89

X number of bytes read from slave (up to 32 bytes)

Block Read

Fail: 1

The following describes the detailed bit banking of the Block Read command (with PEC on):

PMBUS/SMBUS start

→ write A (= slave address shifted left by 1 bit + write bit of 0) → slave ACK

→ write B (a command byte defined by PMBUS or SMBUS) → slave ACK → repeated start → write

C (= slave address shifted left by 1 bit + read bit of 1)

→ slave ACK → read in X (number of data

bytes to read from slave)

→ master ACK → repeat (read in next byte → master ACK) for X number

of times

→ read in PEC byte from slave → master NACK → PMBUS/SMBUS stop

PMBUS/SMBUS Communications

SLLU093 – August 2006

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