SM5902AF datasheet(21/40 Pages) NPC

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NIPPON PRECISION CIRCUITS-21

SM5902AF

85H (option settings)

- RAMS1, RAMS2

When 0 and 0 : 1M DRAMs (256k

×4 bits)×single

When 1 and 0 : 4M DRAMs (1M

×4 bits)×single

When 0 and 1 : 4M DRAMs (1M

×4 bits)×double

When 1 and 1 : 16M DRAMs (4M

×4 bits)×single

- RAMX2

When 1: Uses 2 DRAMs

When 0: Uses a single DRAM

- YFLGS, YFCKP

When 0 and 0: Sets FLAG6 on the falling edge of

YFCLK when YFLAG=0

When 0 and 1: Sets FLAG6 on the rising edge of

YFCLK when YFLAG=0

When 1 and 0: Sets FLAG6 when YFLAG=0

When 1 and 1: Sets FLAG6 when YFLAG=1

- COMPFB, COMP6B, COMP5B, COMP4B

When 0, 0, 0 and 1: Selects 4-bit compression

mode

When 0, 0, 1 and 0: Selects 5-bit compression

mode

When 1, 0, 0 and 0: Selects full-bit compression

mode

In all other cases: Selects 6-bit compression mode

Changing mode without initializing during opera-

tion is possible.

83H (ATT, MUTE, 12-bit comparison connection settings)

- ATT (attenuator enable)

When 1: Attenuator settings become active (84H

command)

When 0: Attenuator settings become inactive, and

output continues without attenuation

- MUTE (forced muting)

When 1: Outputs are instantaneously muted to

0.(note 1)

Same effect as taking the YDMUTE pin

HIGH.

When 0: No muting(note 1)

(note1) Effective at the start of left-channel output

data.

- SOFT (soft muting)

When 1: Outputs are smoothly muted to 0.

When 0: No muting.

Soft mute release occurs instantaneously

to either the value set by the 84H com-

mand (When ATT=1) or 0dB (When

ATT=0)

- MUTE, SOFT, YDMUTE relationship

When all mute inputs are 0, mute is released.

- NS (noise shaper enable)

When 1: Includes noise shaper function in com-

pression-mode shockproof operation.

When 0: Performs comparison connection using

all 16 bits of input data.

- CMP12 (12-bit comparison connection)

When 1: Performs comparison connection using

only the most significant 12 bits of input

data.

When 0: Performs comparison connection using

all 16 bits of input data.

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