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B.19 Block Read – Block Write Process Call Command and Response

B.20 Group Command and Response

Block Read – Block Write Process Call 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

Block Read –

C number of bytes (from 1 up

Block Write

0x0A

to 31 bytes) to write

Process Call

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

Block Read –

Success: 0

0x8A

X number of bytes read from slave (up to 31 bytes)

Block Write

Fail: 1

Process Call

The following describes the detailed bit banking of the Block Read – Block Write Process Call 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 data

bytes to write)

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

repeated start

→ write D (= 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

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

Write 0 to D if

Group

D (0xFF for

C number of bytes (from 1 up

0x0B

not for the last

Command

last packet)

to 32 bytes) to write

packet

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

Group

0x8B

Fail: 1

Command

The following describes the detailed bit banking of the Group 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 → if byte D = 0xFF, then (PMBUS/SMBUS stop); otherwise, wait to

receive the next USB packet for more writing to slave(s)

SLLU093 – August 2006

PMBUS/SMBUS Communications

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