SM5903BF

SM5903BF NIPPON PRECISION CIRCUITS INC. compression and non compression type shock-proof memory controller Overview The SM5903BF is a compression and non compression 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 (1M, 4M, 4M× 2, 16M). It operates from a 2.4 to 3.6 V supply voltage range. Features - 2-channel processing - Serial data input ⋅ 2s complement, 16-bit/MSB first, right-justified format ⋅ Wide capture function (up to 3 × speed input rate) - System clock input ⋅ 384fs (16.9344 MHz) - Shock-proof 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 1 × 16M DRAM (4M × 4 bits, refresh cycle = 2048 cycle) 1 × or 2 × 4M DRAM (1M × 4 bits) 1 × 1M DRAM (256k × 4 bits) - Microcontroller interface ⋅ Serial command write and status read-out ⋅ Data residual detector: 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 p...