PCI1221 datasheet(78/123 Pages) TI

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Table 35. Serial Bus Index Register

BIT

SIGNAL

TYPE

FUNCTION

7-0

SBINDEX

R/W

Serial bus index. This bit field represents the byte address in a read or write transaction on the serial

interface.

serial bus slave address register

Bit

Name

Serial bus slave address

Type

R/W

Default

Serial bus slave address

Type:

Read/write

Offset:

B2h (function 0)

Default:

00h

Description: The serial bus slave address register is for programmable serial bus byte read and write

transactions. To write a byte, the serial bus data register must be programmed with the data,

the serial bus index register must be programmed with the byte address, and this register

must be programmed with both the 7-bit slave address and the read/write indicator bit.

On byte reads, the byte address is programmed into the serial bus index register

, this register

must be programmed with both the 7-bit slave address and the read/write indicator bit must be

set, and the REQBUSY bit in the serial bus control and status register must be polled until

clear. Then the contents of the serial bus data register are valid read data from the serial bus

interface. See Table 36 for a complete description of the register contents.

Table 36. Serial Bus Slave Address Register

BIT

SIGNAL

TYPE

FUNCTION

7-1

SLAVADDR

R/W

Serial bus slave address. This bit field represents the slave address of a read or write transaction on the

serial interface.

RWCMD

R/W

Read/write command. Bit 0 indicates the read/write command bit presented to the serial bus on byte read

and write accesses

0 = A byte write access is requested to the serial bus interface

1 = A byte read access is requested to the serial bus interface

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