LM4560 datasheet(49/54 Pages) NSC

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4.0 Functional Description (Continued)

Read/Write

Bit

7..1

reserved

Bit 0

AGC disable

AGC enable

MX44 Treble Left Control

Default 80h

Read/Write

Bit 7..4 16 level treble left control

Bit 3..0 reserved

MX45 Treble Right Control

Default 80h

Read/Write

Bit 7..4 16 level treble right control

Bit 3..0 reserved

MX46 Bass Left Control

Default 80h

Read/Write

Bit 7..4 16 level bass left control

Bit 3..0 reserved

MX47 Bass Right Control

Default 80h

Read/Write

Bit 7..4 16 level bass right control

Bit 3..0 reserved

4.2.1.21 SB16 Configuration/Status Register

MX80 Sound Blaster Interrupt Setup Register

Default 00h

Read/Write

Bit

7..6

reserved (read as 1)

Bit 5

IRQ12 is used as legacy SB interrupt

line

Bit 4

IRQ11 is used as legacy SB interrupt

line

Bit 3

IRQ10 is used as legacy SB interrupt

line

Bit 2

IRQ7 is used as legacy SB interrupt

line

Bit 1

IRQ5 is used as legacy SB interrupt

line

Bit 0

IRQ9 is used as legacy SB interrupt

line

Only 1 bit of this register can be set 1 at any one time

Content of this register must be consistent with header 1 in-

terrupt line configuration register.

MX81 Sound Blaster DMA Channel Setup Register

Default 00h

Read/Write

Bit

7..2

reserved (read as 0)

Bit 1

legacy DMA channel 1 is used as

legacy SB DMA channel

Bit 0

legacy DMA channel 0 is used as

legacy SB DMA channel

Only 1 bit of this register can be set 1 at any one time

Content of this register must be consistent with CR1 on SB

DMA channel setup.

MX82 Sound Blaster Interrupt Status Register

Default 00h

Read Only

Bit

7..3

reserved

Bit 2

MPU-401 MIDI interrupt request

Bit 1

Sound Blaster Bx type command DMA

interrupt request

Bit 0

Sound Blaster Non-Bx type command

DMA interrupt request

0: no interrupt

1: interrupt triggered

4.2.1.22 Interface With Wave Engine

4.2.1.22.1 Interfaced Register

All registers that physically implemented in wave engine are

addressed using the 3-bit wide address line and 8-bit wide

unidirectional data line initiated by Sound Blaster ESP Emu-

lation Engine. These registers are considered to be the pe-

ripheral registers of implemented SB ESP engine.

4.2.1.22.2 SB ESP DMA Control Register

4.2.1.22.2.1 SBDMPD Direct Mode Playback Data Register

SB ESP Address: 6h

Size: 8 bits

Type: Write Only For SB ESP

Read Only For Wave Engine

Default: 80h

Bit 7..0 Direct Mode Playback Data

Any time after this register has ever been written, a Direct-

ModePlay internal flag will be set by wave engine. This flag

will

cleared

when

ESPRESET

active

LegacyDMARun is active. When this flag is active, the un-

signed 8 bit PCM data will be output to AC-97 Codec.

4.2.1.22.2.2 SBE2R DMA Testing Byte Register

SB ESP Address: 7h

Size: 8 bits

Type: Write Only For SB ESP

Read Only For Wave Engine

Default: 00h

Bit 7..0 testing byte that will be transferred to system location

specified by DMAR0–3.

After this register has ever been written, E2Status (source

from wave engine) will be set high. E2Status will be cleared

after the testing byte has been sent to the system location.

4.2.1.22.2.3 SBDMAC SB DMA Current Block Length Low

Byte

SB ESP Address: 0h

Size: 8 bits

Type: Write Only For SB ESP

Read Only For Wave Engine

LM4560 Datasheet(PDF) 49 Page - National Semiconductor (TI)

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