USB2517 datasheet(40/58 Pages) MICROCHIP

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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

Slave Address

171

...

Byte Count = N

Data byte 1

Data byte 2

Data byte N

Block Write

Block Read

Slave Address

Byte Count = N

Data byte 1

Data byte 2

Data byte N

...

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