SM5903CF Datasheet, PDF (1/31 Pages) Nippon Precision Circuits Inc – compression and non compression type anti-shock memory controller

NIPPON PRECISION CIRCUITS INC.
SM5903CF
compression and non compression type
anti-shock memory controller
Overview
The SM5903CF is a compression and non com-
pression 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)
Ordering Information
SM5903CF 44pin QFP
NIPPON PRECISION CIRCUITS-1