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PCI6421 Datasheet(PDF) 110 Page - Texas Instruments |
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PCI6421 Datasheet(HTML) 110 Page - Texas Instruments |
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110 / 204 page  4−34 4.47 Serial Bus Data Register The serial bus data register is for programmable serial bus byte reads and writes. This register represents the data when generating cycles on the serial bus interface. To write a byte, this register must be programmed with the data, the serial bus index register must be programmed with the byte address, the serial bus slave address must be programmed with the 7-bit slave address, and the read/write indicator bit must be reset. On byte reads, the byte address is programmed into the serial bus index register, the serial bus slave address register must be programmed with both the 7-bit slave address and the read/write indicator bit, and bit 5 (REQBUSY) in the serial bus control and status register (see Section 4.50) must be polled until clear. Then the contents of this register are valid read data from the serial bus interface. See Table 4−22 for a complete description of the register contents. Bit 7 6 5 4 3 2 1 0 Name Serial bus data Type RW RW RW RW RW RW RW RW Default 0 0 0 0 0 0 0 0 Register: Serial bus data Offset: B0h (function 0) Type: Read/Write Default: 00h Table 4−22. Serial Bus Data Register Description BIT SIGNAL TYPE FUNCTION 7−0 ‡ SBDATA RW Serial bus data. This bit field represents the data byte in a read or write transaction on the serial interface. On reads, the REQBUSY bit must be polled to verify that the contents of this register are valid. ‡ One or more bits in this register are cleared only by the assertion of GRST. 4.48 Serial Bus Index Register The serial bus index register is for programmable serial bus byte reads and writes. This register represents the byte address when generating cycles on the serial bus interface. To write a byte, the serial bus data register must be programmed with the data, this register must be programmed with the byte address, and the serial bus slave address must be programmed with both the 7-bit slave address and the read/write indicator. On byte reads, the word address is programmed into this register, the serial bus slave address must be programmed with both the 7-bit slave address and the read/write indicator bit, and bit 5 (REQBUSY) in the serial bus control and status register (see Section 4.50) 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 4−23 for a complete description of the register contents. Bit 7 6 5 4 3 2 1 0 Name Serial bus index Type RW RW RW RW RW RW RW RW Default 0 0 0 0 0 0 0 0 Register: Serial bus index Offset: B1h (function 0) Type: Read/Write Default: 00h Table 4−23. Serial Bus Index Register Description BIT SIGNAL TYPE FUNCTION 7−0 ‡ SBINDEX RW Serial bus index. This bit field represents the byte address in a read or write transaction on the serial interface. ‡ One or more bits in this register are cleared only by the assertion of GRST. |
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