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USB-TO-GPIO Datenblatt(PDF) 44 Page - Texas Instruments

Teilenummer USB-TO-GPIO
Bauteilbeschribung  USB Interface Adapter Evaluation Module
PDF  50 Pages
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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USB-TO-GPIO Datenblatt(HTML) 44 Page - Texas Instruments

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B.13 Write Word Command and Response
B.14 Read Byte Command and Response
Write Word 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
Write Word
0x04
A
B
C
D
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
0x84
Write Word
Fail: 1
The following describes the detailed bit banking of the Write Word 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 (low byte of a
data word)
→ slave ACK → write D (high byte of the data word) → slave ACK → 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
Read Byte
0x05
A
B
C
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
Byte read
0x85
Read Byte
Fail: 1
from slave
The following describes the detailed bit banking of the Read Byte 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 1 data byte from
slave
→ master ACK → read in PEC byte from slave → master NACK → PMBUS/SMBUS stop
PMBUS/SMBUS Communications
44
SLLU093 – August 2006
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