SM5859AF Datasheet, PDF (1/33 Pages) Nippon Precision Circuits Inc – compression and non compression type antishock memory controller

NIPPON PRECISION CIRCUITS INC.
SM5859AF
compression and non compression type anti-
shock memory controller
Overview
The SM5859 is a compression and non compres-
sion type anti-shock memory controller LSI for com-
pact 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 atten-
uator, 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)
NIPPON PRECISION CIRCUITS-1