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USB-TO-GPIO Datasheet(PDF) 43 Page - Texas Instruments

Part # USB-TO-GPIO
Description  USB Interface Adapter Evaluation Module
PDF  50 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

USB-TO-GPIO Datasheet(HTML) 43 Page - Texas Instruments

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B.10 Send Byte Command and Response
B.11 Receive Byte Command and Response
B.12 Write Byte Command and Response
Send Byte 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
Send Byte
0x01
A
B
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
0x81
Send Byte
Fail: 1
The following describes the detailed bit banking of the Send 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 → 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
Receive Byte
0x02
A
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
0x82
Receive Byte
Fail: 1
from slave
The following describes the detailed bit banking of the Receive Byte command (with PEC on):
PMBUS/SMBUS start
→ write A (= 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
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 Byte
0x03
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
0x83
Write Byte
Fail: 1
The following describes the detailed bit banking of the Write 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 → write C (a data byte) →
slave ACK
→ write PEC byte → slave ACK → PMBUS/SMBUS stop
SLLU093 – August 2006
PMBUS/SMBUS Communications
43
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