Generic Programming Sequence

1

7

1

1

8

1

1

S

Slave Address

A

DataByte

A

P

MSB

LSB

MSB

LSB

S

StartCondition

Sr

RepeatedStartCondition

1=Read(Rd)fromCDCE9xxdevice;0=Write(Wr)totheCDCE9xxx

A

Acknowledg(ACK=0andNACK=1)

P

StopCondition

MastertoSlave Transmission

SlavetoMaster Transmission

R/W

R/W

Byte Write Programming Sequence

1

7

1

1

8

1

1

1

S

Slave Address

Wr

A

A

A

P

DataByte

CommandCode

8

Byte Read Programming Sequence

1

7

1

1

1

1

1

1

S

Slave Address

Wr

A

A

S

Rd

A

8

1

1

DataByte

A

P

CommandCode

8

7

Slave Address

Block Write Programming Sequence

1

7

1

1

1

1

S

Slave Address

Wr

A

A

A

8

1

1

1

1

DataByte0

A

A

A

P

8

DataByteN-1

…

8

DataByte1

8

CommandCode

ByteCount=N

8

CDCE949

CDCEL949

SCAS844 – JUNE 2007

Table 6. Command Code Definition

BIT

DESCRIPTION

0 = Block Read or Block Write operation

7

1 = Byte Read or Byte Write operation

(6:0)

Byte Offset for Byte Read, Block Read, Byte Write and Block Write operation.

Figure 7. Generic Programming Sequence

Figure 8. Byte Write Protocol

Figure 9. Byte Read Protocol

NOTE: Data Byte 0 Bits [7:0] is reserved for Revision Code and Vendor Identification. Also it is used for internal test purpose

and should not be overwritten.

Figure 10. Block Write Programming

12

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