IDT5V19EE604

EEPROM PROGRAMMABLE VCXO CLOCK GENERATOR

CLOCK SYNTHESIZER

IDT® EEPROM PROGRAMMABLE VCXO CLOCK GENERATOR

13

IDT5V19EE604

REV M 092412

Programming the Device

I2C may be used to program the IDT5V19EE604.

– Device (slave) address = 7'b1101010

I2C Programming

The IDT5V19EE604 is programmed through an I2C-Bus

serial interface, and is an I2C slave device. The read and

write transfer formats are supported. The first byte of data

after a write frame to the correct slave address is interpreted

as the register address; this address auto-increments after

each byte written or read.

The frame formats are shown in the following illustration.

Framing

First Byte Transmitted on I2C Bus

External I2C Interface Condition

Progwrite

Progwrite Command Frame

Writes can continue as long as a Stop condition is not sent and each byte will increment the register address.

1

0

1

0

1

0

1

MSB

LSB

R/W

ACK from Slave

R/W

0 – Slave will be written by master

1 – Slave will be read by master

The first byte transmitted by the Master is the Slave Address followed by the R/W bit.

The Slave acknowledges by sending a “1” bit.

7-bit slave address

KEY:

From Master to Slave

From Master to Slave, but can be omitted if followed by the correct sequence

Normally, data transfer is terminated by a STOP condition generated by the Master. However, if the Master still wishes to communicate on the bus, it can

generate a separate START condition, and address another Slave address without first generating a STOP condition.

From Slave to Master

SYMBOLS:

ACK - Acknowledge (SDAT LOW)

NACK – Not Acknowledge (SDAT HIGH)

SR – Repeated Start Condition

S – START Condition

P – STOP Condition

SAddress

R/W

ACK

Command Code

ACK

Register

ACK

Data

ACK

P

7-bits

0

1-bit

8-bits: xxxx xx00

1-bit

8-bits

1-bit

8-bits

1-bit