COMMERCIALTEMPERATURERANGE

4

IDTCV123

PROGRAMMABLEFLEXPC™CLOCKFORP4PROCESSOR

PIN DESCRIPTION (CONT.)

Pin Number

Name

Type

Description

43

CPUC1

OUT

Host 0.7V current mode differential clock output

44

CPUT1

OUT

Host 0.7V current mode differential clock output

45

PWR

3.3V

46

CPUC0

OUT

Host 0.7V current mode differential clock output

47

CPUT0

OUT

Host 0.7V current mode differential clock output

48

GND

GND

49

SCL

IN

SM bus clock

50

SDA

I/O

SM bus data

51

XTAL_OUT

OUT

Xtaloutput

52

XTAL_IN

IN

Xtalinput

53

GND

GND

54

REF1/ FSA

I/O

55

REF0/ FSC

I/O

56

PWR

3.3V

INDEX BLOCK WRITE PROTOCOL

Bit

# of bits

From

Description

1

1

Master

Start

2-9

8

Master

D2h

10

1

Slave

Ack (Acknowledge)

11-18

8

Master

Registeroffsetbyte(startingbyte)

19

1

Slave

Ack (Acknowledge)

20-27

8

Master

Byte count, N, (0 is not valid

28

1

Slave

Ack (Acknowledge)

29-36

8

Master

first data byte (Offset data byte)

37

1

Slave

Ack (Acknowledge)

38-45

8

Master

2nd data byte

46

1

Slave

Ack (Acknowledge)

:

Master

Nth data byte

Slave

Acknowledge

Master

Stop

INDEX BLOCK READ PROTOCOL

Master can stop reading any time by issuing the stop bit without waiting

until Nth byte (byte count bit30-37).

Bit

# of bits

From

Description

1

1

Master

Start

2-9

8

Master

D2H

10

1

Slave

Ack (Acknowledge)

11-18

8

Master

Registeroffsetbyte(startingbyte)

19

1

Slave

Ack (Acknowledge)

20

1

Master

RepeatedStart

21-28

8

Master

D3H

29

1

Slave

Ack (Acknowledge)

30-37

8

Slave

Byte count, N (block read back of N

bytes), power on is 8

38

1

Master

Ack (Acknowledge)

39-46

8

Slave

first data byte (Offset data byte)

47

1

Master

Ack (Acknowledge)

48-55

8

Slave

2nd data byte

Ack (Acknowledge)

:

Master

Ack (Acknowledge)

Slave

Nth data byte

Notacknowledge

Master

Stop

INDEX BYTE WRITE

Setting bit[11:18] = starting address, bit[20:27] = 01h.

INDEX BYTE READ

Setting bit[11:18] = starting address. After reading back the first data byte,

masterissuesStopbit.