SM5905AF

SM5905AF NIPPON PRECISION CIRCUITS INC. compression and non compression type shock-proof memory controller Overview The SM5905AF 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 4M DRAM can be connected to expand the memory to 4M bits. Digital attenuator, soft mute and related functions are also incorporated. 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, 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 6-bit compression mode 1.85 s/Mbit 8-bit compression mode 1.39 s/Mbit Full-bit non compression mode 0.74 s/Mbit ⋅ External DRAM configurations usable 2 × 4M DRAM (1M × 4 bits) Internal and External 4M DRAM 1 × 4M DRAM (1M × 4 bits) Only Internal 4M DRAM - Compression mode selectable - Microcontroller interface ⋅ Serial command write and status read-out ⋅ Data residual detector: 15-bit operation, 16-bit output ⋅ Digital attenuator 8-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 interf...