SM5901AF

SM5901AF compression and non compression type anti-shock memory controller with built-in 1M DRAM NIPPON PRECISION CIRCUITS INC. Overview The SM5901 is a compression and non compression type anti-shock memory controller with built-in 1M DRAM LSI for compact disc players. The compression level can be set in 4 levels, and external 1M DRAM can be connected to expand the memory to 2M bits. Digital attenuator, soft mute and related functions are also incorporated. It operates from a 2.7 to 3.3 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) Digital attenuator - Anti-shock memory controller - ADPCM compression method 4-level compression mode selectable pre lim 2×1M DRAM (256K×4 bits) Internal and external 1M DRAMs 1×1M DRAM (256K×4 bits) Only internal 1M DRAM - Compression mode selectable - Microcontroller interface Serial command write and state read-out Data residual quantity detector: 15-bit operation, 16-bit output 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 0.70 s/Mbit External memory can be connected ina Full-bit setting Soft attenuator function 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 +3.3 V wide ...