X9470 datasheet(20/25 Pages) XICOR

20 / 25 page

Preliminary Information

X9470

20 of 25

REV 11.16 3/20/03

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X9470 BUS INTERFACE INFORMATION

Figure 7. Slave Address, Word Address, and Data Bytes - Write Mode

Figure 8. Slave Address, Word Address, and Data Bytes - Read Mode

Slave Address, Byte Address, and Data Byte

The byte communication format for the serial bus is

shown in Figures 7 and 8 above. The ﬁrst byte, BYTE

0, deﬁnes the device indentiﬁer, 0101 in the upper half;

and the device slave address in the low half of the byte.

The slave address is determined by the logic values of

the A0, A1, and A2 pins of the X9470. This allows for

up to 8 unique addresses for the X9470. The next byte,

BYTE 1, is the Byte Address. The Byte Address identi-

ﬁes a unique address for the Status or Control Regis-

ters as shown in Table 3. The following byte, Byte 2, is

the data byte that is used for READ and WRITE opera-

tions.

Start Condition

All commands are preceded by the start condition,

which is a HIGH to LOW transition of SDA when SCL is

HIGH. The device continuously monitors the SDA and

SCL lines for the start condition and will not respond to

any command until this condition has been met. See

Figure 9.

Slave Address Byte

Byte 0

Data Byte

Byte 2

R/W=0

Device Identifier

Byte Address

Byte 1

Slave Address

0Fh:SR

00h : VBIAS

01h : VREF

Slave Address Byte

Byte 0

Data Byte

Byte 2

R/W

Device Identifier

Data Byte

Byte 1

Slave Address

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