Data I/O Techniques

CCB Technique

Sanyo audio ICs input and output data using the Sanyo CCB (computer control bus) standard, which is a serial bus

format. This IC uses an 8-bit address CCB and uses the following addresses.

No. 5744-5/14

LC72705E

I/O mode

Address

Function

B0

B1

B2

B3

A0

A1

A2

A3

Input

0

1

0

1

1

1

1

1

16-bit control data input

Output

1

1

0

1

1

1

1

1

Data output for the input clock (CL)

Input

0

0

1

1

1

1

1

1

Data input (in 8-bit units) for the layer 4 CRC check circuit

Data Input Timing

Note: The DO pin is normally left open.

Since the DO pin is an n-channel open drain pin, the time required for the data to change from the low level to the high level depends on the value of

the pull-up resistor.

Data Output Timing

I/O mode datermined

Internal data latching