Le58083
Data Sheet
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 page 86.
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.
Global bits and commands refer to a four-channel group of the device.
00h Deactivate (Standby State)
MPI Command
D7
0
D6
0
D5
0
D4
0
D3
0
D2
0
D1
0
D0
0
Command
In the Deactivate (Standby) state:
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 high
way is programmed (SMODE = 1).
The analog output (VOUT) is disabled and biased at VREF.
The channel status (CSTAT) bit in the SLIC device I/O Direction and Channel Status Register is set to 0.
02h Software Reset
MPI Command
D7
0
D6
0
D5
0
D4
0
D3
0
D2
0
D1
1
D0
0
Command
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, ground key sampling interval
or global chip parameters. See the note under the hardware reset command that follows.
04h Hardware Reset
MPI Command
D7
0
D6
0
D5
0
D4
0
D3
0
D2
1
D1
0
D0
0
Command
Hardware reset is equivalent to pulling the RST on a four-channel group of 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 37 of the section Operating the Le58083 Octal SLAC Device.
06h No Operation
MPI Command
D7
0
D6
0
D5
0
D4
0
D3
0
D2
1
D1
1
D0
0
Command
0Eh Activate Channel (Operational State)
MPI Command
D7
0
D6
0
D5
0
D4
0
D3
1
D2
1
D1
1
D0
0
Command
This command places the device in the Active mode and sets CSTAT = 1. No valid PCM data is transmitted until after the
second FS pulse is received following the execution of the Activate command.
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