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IDT821068

OCTAL PROGRAMMABLE PCM CODEC

Integrated Device Technology 

IDT821068 OCTAL PROGRAMMABLE PCM CODEC

INDUSTRIAL TEMPERATURE RANGE

Only b[2:0] of a FSK-RAM Command are needed to address the 4

blocks in FSK-RAM, b3 should always be 0, and b4 always be 1 to

indicate the address is for FSK-RAM.

The way of addressing FSK-RAM is similar to that of addressing

Coe-RAM. When the address of a FSK-RAM block is specified in a

FSK-RAM Command, all 8 words in the block will be Read/Write

automatically, with the highest order word first.

In MPI mode, when read/write a FSK-RAM block, the procedure of

addressing words can be stopped by CS signal at any time. When CS

change from low to high, the operation of the current word and the

next adjacent words will be aborted. But this will not change the results

of the previous operation.

Table 7 - Coe-RAM Command Transmission Sequence in MPI

Mode

Data Transmitted On CI Pin

Global Command 6

(Channel Program Enable byte)

Coe-RAM Command byte, Write

Data word 1 (Data_H, Data_L**)

Data word 2 (Data_H, Data_L)

.

.

.

Data word 8 (Data_H, Data_L)

Data Received on CO Pin

EXAMPLES OF MPI COMMANDS

Examples of Local Command, Global Command, Coe-RAM

Command and FSK-RAM Command are shown in Table 5, 6, 7 and

8 respectively.

Table 5 - Local Command Transmission Sequence in MPI Mode

Data Transmitted On CI Pin

Global Command 6

(Channel Program Enable byte)

Local Command byte, Write

Data byte 1

.

.

.

Data byte m*

Data Received on CO Pin

Global Command 6

(Channel Program Enable byte)

Local Command byte, Read

Identification Code (81H)

Data byte 1

.

.

.

Data byte m*

Table 6 - Global Command Transmission Sequence in MPI Mode

Data Transmitted On CI Pin

Global Command byte, Write

Data byte 1

.

.

.

Data byte m*

Data Received on CO Pin

Global Command 6

(Channel Program Enable byte)

Coe-RAM Command byte, Read

Identification Code ( 81H )

Data word 1 (Data_H, Data_L **)

Data word 2 (Data_H, Data_L)

.

.

.

Data word 8 (Data_H, Data_L)

Table 8 - FSK-RAM Command Transmission Sequence in MPI

Mode

Data Transmitted On CI Pin

FSK-RAM Command byte, Write

Data word 1 (Data_H, Data_L** )

Data word 2 (Data_H, Data_L)

.

.

.

Data word 8 (Data_H, Data_L)

Data Received on CO Pin

FSK-RAM Command byte, Read

Identification Code ( 81H )

Data word 1 (Data_H, Data_L **)

Data word 2 (Data_H, Data_L)

.

.

.

Data word 8 (Data_H, Data_L)

Global Command byte, Read

Identification Code (81H)

Data byte 1

.

.

.

Data byte m*

21

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