SM5907AF
NIPPON PRECISION CIRCUITS INC.
compression and non compression type
shock-proof memory controller
Overview
The SM5907AF is a compression and non com-
pression type shock-proof 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 (4M, 4M× 2, 16M, 16M× 2).
It operates from a 2.4 to 3.6 V supply voltage
range.
Features
- 2-channel processing
- Serial data input
format
⋅
Wide capture function
(up to 3
×
speed input rate)
- System clock input
⋅
384fs (16.9344 MHz)
- Shock-proof memory controller
⋅
ADPCM compression method
⋅
2s complement, 16-bit/MSB first, right-justified
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
1 or 2
×
16M DRAM (4M
×
4 bits, refresh
cycle = 2048 cycle)
1 or 2
×
4M DRAM (1M
×
4 bits)
lim
44-pin QFP
⋅
4-level compression mode selectable
pre
Ordering Information
SM5907AF
NIPPON PRECISION CIRCUITS-1
ina
⋅
Data residual detector:
- Microcontroller interface
⋅
Serial command write and status read-out
15-bit operation, 16-bit output
⋅
Forced mute
- Extension I/O
Microcontroller interface for external control
using 5 extension I/O pins
- +2.4 to +3.6 V 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)
ry
NPC [ NIPPON PRECISION CIRCUITS INC ]
