Overview

The SM5859 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, 1M×2, 4M, 4M×2). Digital attenuator, soft mute and related functions are also incorporated. It operates from a 2.7 to 5.5 V wide supply voltage range.

Features

- 2-channel processing

- Serial data input

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

- 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

2×4M DRAM (1M×4 bits)

1×4M DRAM (1M×4 bits)

2×1M DRAM (256K×4 bits)

1×1M DRAM (256K×4 bits)

- Compression mode selectable

- Microcontroller interface

?Serial command write and state read-out

?Data residual quantity detector:

15-bit operation, 16-bit output

?Digital attenuator Full-bit setting

?Soft attenuator function Noiseless attenuation-level switching (256- step switching in 23 ms max.)

?Soft mute function

Mute ON in 23 ms max. Direct return after soft mute release

?Forced mute

- Extension I/O

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

- +2.7 to +5.5 V wide operating voltage range

- Schmitt 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)