4. Serial Control Data Input Setting Values

The input data consists of 16 bits (DI0 to DI15) of which the upper 8 bits (DI8 to DI15) are the control address

and the lower 8 bits (DI0 to DI7) are the input data.

Note: 1. The data in address bits DI12 to DI15 is ignored.

2. The value of the data sent to set the protection count must be one less than the desired protection count. In the default example shown above, the

block forward protection count will be 8 and the frame back protection count will be 2. When the value is set to 0, the protection count will be 1.

Since a protection count of 0 is meaningless the LSI ignores this value.

3. The initial threshold value is the initial value used when executing error correction at a variable threshold. There is no need to change this value

unless some special experiment is being performed. The threshold value can be set to a value from 9 to 15 according to a three-bit field. Therefore

a data value of 7 sets the threshold value to 15 and a data value of 1 sets the threshold value to 9.

4. The readout block number is transferred when the skip function is used.

5. Addresses other than those listed above (e.g. 0101) are special addresses unique to this LSI and are for test mode and other functions. These

addresses should not be used.

6. The default values are the values loaded into internal registers when a reset signal (RST) is received. These are recommended values and do not

require modification in normal operation. If the default values are used then there will be no need to implement control microprocessor software

that inputs control data.

No. 4870-6/14

LC72700E, LC72700G

Register

Address

Data

Default setting

DI11

DI10

DI9

DI8

Allowed error count

0

0

0

0

Upper 4 bits

Back allowed errors

2

Lower 4 bits

Forward allowed errors

2

Block error protection count

0

0

0

1

Upper 4 bits

Back protection count

1

Lower 4 bits

Forward protection count

7

Frame error protection count

0

0

1

0

Upper 4 bits

Back protection count

1

Lower 4 bits

Forward protection count

7

Error correction initial

0

0

1

1

Upper 5 bits

—

—

threshold value

Lower 3 bits

Initial threshold value

7

Readout (output) block number

0

1

0

0

0 to 189 (8 bits)

0