Overview

The SM5903CF is a compression and non compression type anti-shock memory controller LSI for compact disc players. The compression level can be set in 4 levels, and external memory can be selected from 4 options (1M, 4M, 4M× 2, 16M). It operates from a 4.5 to 5.5 V supply voltage range.

Features

- 2-channel processing

- Serial data input

• 2s complement, 16-bit/MSB first, rear-packed format

• Wide capture function (until triple speed available)

- System clock input

• 384fs (16.9344 MHz)

- Anti-shock memory controller

• ADPCM compression method

• 4-level compression mode selectable

4-bit compression mode 2.78 s/Mbit

5-bit compression mode 2.22 s/Mbit

6-bit compression mode 1.85 s/Mbit

Full-bit non compression mode 0.74 s/Mbit

• 4 external DRAM configurations selectable 16M DRAM (4M × 4 bits ×1,refresh cycle 2048 cycle)

4M DRAM (1M × 4 bits ×1 or ×2)

1M DRAM (256k × 4 bits ×1)

- Microcontroller interface

• Serial command write and state read-out

• Data residual quantity detector: 15-bit operation, 16-bit output

• Forced mute

- Extension I/O

Microcontroller interface for external control using 5 extension I/O pins

- +4.5 to +5.5 V operating voltage range

- Schmidt inputs

All input pins (including I/O pins) except CLK (system clock)

- Reset signal noise elimination

Approximately 3.8 µs or longer (65 system clock pulses) continuous LOW-level reset

- 44-pin QFP package (0.8 mm pin pitch)