SM5901AF datasheet(1/31 Pages) NPC

部件名	SM5901AF

功能描述	compression and non compression type anti-shock memory controller with built-in 1M DRAM

PDF	31 Pages

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制造商	NPC [Nippon Precision Circuits Inc]

网页	http://www.npc.co.jp/en

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1 / 31 page

NIPPON PRECISION CIRCUITS INC.

SM5901AF

compression and non compression type anti-shock

memory controller with built-in 1M DRAM

Overview

- 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 0.70 s/Mbit

•External memory can be connected

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

•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 +3.3 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)

The SM5901 is a compression and non compres-

sion type anti-shock memory controller with built-in

1M DRAM LSI for compact disc players. The com-

pression level can be set in 4 levels, and external

1M DRAM can be connected to expand the memo-

ry to 2M bits. Digital attenuator, soft mute and relat-

ed functions are also incorporated. It operates from

a 2.7 to 3.3 V wide supply voltage range.

Features

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