AM79Q02 datasheet(39/68 Pages) ETC1

39 / 68 page

SLAC Products

MPI COMMAND STRUCTURE

This section details each MPI command. Each command is shown along with the format of any additional data bytes

that follow. For details of the filter coefficients of the form Cxymxy, refer to the General Description of CSD Coefficients

section on page 56.

Unused bits are indicated by “RSVD”; 0’s should be written to them, but 0’s are not guaranteed when they are read.

*Default field values are marked by an asterisk. A hardware reset forces the default values.

Deactivate (Standby State)

MPI Command

(00h)

In the Deactivated mode:

All programmed information is retained.

The Microprocessor Interface (MPI) remains active.

The PCM inputs are disabled and the PCM outputs are high impedance unless

signaling on the PCM highway is programmed (SMODE = 1).

The analog output (VOUT) is disabled and biased at 2.1 V.

The channel status (CS) bit in the SLIC I/O Direction and Channel Status Register is

set to 0.

Software Reset

MPI Command

(02h)

The action of this command is identical to that of the RST pin except that it only operates on the

channels selected by the Channel Enable Register and it does not change clock slots, time slots,

PCM highways, or global chip parameters. See the note under the hardware reset command

that follows.

Hardware Reset

MPI Command

(04h)

Hardware reset is equivalent to pulling the RST on the device Low. This command does not

depend on the state of the Channel Enable Register.

Note: The action of a hardware reset is described in Reset States on page 31 of the section Operating

the QSLAC Device.

Command

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