MAS3587F Micronas, MAS3587F Datasheet - Page 7

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

ADVANCE INFORMATION
2. Functional Description of the MAS 3587F
2.1. Overview
The MAS 3587F is intended for use in consumer audio
applications. It encodes analog audio input, PCM data
or S/PDIF signals to variable bit rate MPEG 1/2 Layer
3 data streams. The compressed data is stored in an
external memory via the parallel port. For playback it
receives S/PDIF, parallel or serial data streams and
decodes MPEG Layer 2 and 3 (including the low sam-
pling frequency extensions).
2.2. Architecture of the MAS 3587F
The hardware of the MAS 3587F consists of a high-
performance RISC Digital Signal Processor (DSP),
and appropriate interfaces. A hardware overview of the
IC is shown in Fig. 2–1.
Mic. Input
(incl. Bias)
Line Input
S/PDIF Input 1
S/PDIF Input 2
Serial Audio
(I
Serial Audio
(stream, SDIB)
Xtal
18.432 MHz
Fig. 2–1: The MAS 3587F architecture
Micronas
2
S, SDI)
V
V1
V2
BAT
1
2
Mon.
Osc.
Volt.
A/D
Div.
Synth.
PLL
Accumulators
ALU
D0
Registers
2
ROM
Div.
MAC
Synthesizer
D1
2.3. DSP Core
The internal processor is a dedicated DSP for
advanced audio applications.
2.4. RAM and Registers
The DSP core has access to two RAM banks denoted
D0 and D1. All RAM addresses can be accessed in a
20-bit or a 16-bit mode via I
internal DSP states the processor core has an address
space of 256 data registers which can be accessed by
I
on page 24.
2
Clock
C bus. For more details please refer to Section 3.3.
MIX
Scaler
Control
Codec
DCCF
DCFR
DSP
Audio
Proc.
2
2
C bus. For fast access of
Interface
I
D/A
2
MAS 3587F
C
2
Serial
Audio
(I
Parallel
I/O Bus
(PIO)
2
S/PDIF
Output
Audio
Output
S, SDO)
I
control
2
CLKO
C
7