AM79C02AJC datasheet(27/48 Pages) AMD

27 / 48 page

SLAC Products

COMMAND STRUCTURE

This section describes in detail each of the MPI commands. Each of the commands is shown along with the format

of any additional data bytes that follow. For details of the filter coefficients of the for Cxymxy, please refer to the

Description of Coefficients section.

1. Deactivate (Standby State)

(00h)

During the Inactive state (of one or more channels):

All of the programmed information is retained.

The Microprocessor Interface (MPI) remains active.

The PCM outputs are in high impedance and the PCM inputs are disabled.

The analog output is tied to 2.1 V through an internal resistor (~3 k

Ω).

2. Software Reset

(02h)

The software reset state of the device is:

The channel is placed in the Inactive (standby) mode.

GX, GR, X, R, B, and Z filters are disabled with coefficients retained.

AX and AR are set to unity and AISN gain is set to 0.

The Adaptive B feature is disabled.

A-law is selected.

All SLIC I/O lines are configured as inputs.

Normal conditions are selected (see Command 4).

3. No Operation

(06h)

4. Reset to Normal Conditions

(08h)

Reset to Normal Conditions performs the following operations:

Does not insert 6 dB loss in receive path.

Receive and transmit paths are not cutoff.

High-pass filter is enabled.

Test modes are turned off.

5. Activate (Operational State)

(0Eh)

This command places the device in the Active mode. No valid PCM data is transmitted until

after the second FS pulse is received following the execution of the Activate command.

Command

AM79C02AJC Datasheet(PDF) 27 Page - Advanced Micro Devices