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USB2517 데이터시트(PDF) 40 Page - Microchip Technology

부품명 USB2517
상세설명  USB 2.0 Hi-Speed 7-Port Hub Controller
PDF  58 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

USB2517 데이터시트(HTML) 40 Page - Microchip Technology

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USB2517/USB2517I
DS00001598B-page 40
 2013-2016 Microchip Technology Inc.
Block Read
A Block Read differs from a block write in that the repeated start condition exists to satisfy the I2C specification’s require-
ment for a change in the transfer direction.
7.3.2
INVALID PROTOCOL RESPONSE BEHAVIOR
Registers accessed with an invalid protocol are not updated. A register is only updated following a valid protocol. The
only valid protocols are Write Block and Read Block, which are described above.
The Hub only responds to the hardware selected Slave Address.
Attempting to communicate with the Hub over SMBus with an invalid slave address or invalid protocol results in no
response, and the SMBus Slave Interface returns to the idle state.
The only valid registers that are accessible by the SMBus slave address are the registers defined in the Registers Sec-
tion. See Section 7.3.3 for the response to undefined registers.
7.3.3
GENERAL CALL ADDRESS RESPONSE
The Hub does not respond to a general call address of 0000_000b.
Note:
For the following SMBus tables:
FIGURE 7-1:
BLOCK WRITE
FIGURE 7-2:
BLOCK READ
Denotes Master-to-Slave
Denotes Slave-to-Master
1
81
S
Slave Address
Register Address
Wr
A
171
1
8
A
1
...
Byte Count = N
A
Data byte 1
A
Data byte 2
81
1
1
88
Data byte N
A
P
Block Write
A
Block Read
1
S
S
Slave Address
Register Address
Wr
A
17
1
1
8
A
1
Slave Address
Rd
A
71
1
81
1
1
88
P
1
81
A
A
A
A
Byte Count = N
Data byte 1
Data byte 2
Data byte N
...



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