MAS3587F Micronas, MAS3587F Datasheet - Page 32

• Manufacturer Part Number: MAS3587F
• Description: MPEG Layer 3 Audio Encoder/Decoder
• Manufacturer: Micronas

MAS 3587F
3.3.2. List of DSP Registers
Table 3–5 lists the registers used in the standard firmware (MPEG) and for the download option (Download).
Note: Registers not given in the tables must not be written.
Table 3–5: DSP Register Table
3.3.3. List of DSP Memory Cells
Among the user interface control memory cells there
are some which have a global meaning and some
which control application specific parts of the DSP
core. In the tables below this is reflected by the key-
words All, Encoder and Decoder.
3.3.3.1. Application Select and Running
The AppSelect cell is a global user interface configura-
tion cell, which has to be written in order to start a spe-
cific application.
The AppRunning cell is a global user interface status
cell, which indicates, which application loop is actually
running.
The meaning of the bits in both cells is given in Table
3–6.
Following steps have to be performed to switch
between applications:
– write “0” to AppSelect
32
Address
(hex)
6B
56
1)
IEC 958 Amendment1, “Digital Audio Interface”
R/W
R/W
R
FunctionMode
Configuration of Variable RAM Areas
bit[19]
bit[18]
bit[17]
bit[16]
This register is used to switch four RAM areas from data
to program usage and thus enabling the DSP’s program
counter to access downloaded program code stored at
these locations. For normal operation (firmware in ROM)
this register must be kept to zero.
For details of program code download please refer to
Section 3.3.1.14.
S/PDIF
bit[15:0]
1)
Input Channel Status Bits
Affected RAM area
D0:800 ... D0:BFF
D0:C00 ... D0:FFF
D1:800 ... D1:BFF
D1:C00 ... D1:FFF
channel status bits of incoming signal.
– check AppRunning for “0”
– apply necessary/wanted Control settings
– write value to AppSelect according to Table 3–6
3.3.3.2. Application Specific Control
The configuration of the MPEG Encoder and Decoder
firmware is done via the control memory cells
described in Table 3–7. The changes applied to any of
the control memory cells have to be validated by set-
ting bit[0] of memory cell Main I/O Control except when
the application is started by writing the AppSelect
memory cell. The validate bit will be reset automati-
cally after the changes have been taken over by the
DSP.
The status memory cells are used to read the encoder/
decoder status and to get additional MPEG bitstream
information.
Note: Memory cells not given in the tables must not be
written.
Download
MPEG
Default
(hex)
0000
0000
ADVANCE INFORMATION
Name
PSelect_Shadow
SPIChannelStatus
Micronas