AD1821 Analog Devices, AD1821 Datasheet - Page 37

• Manufacturer Part Number: AD1821
• Manufacturer: Analog Devices

SB Pro; AdLib Registers
The AD1821 contains sets of ISA Bus registers (ports) that correspond to those used by the SoundBlaster Pro audio card from
Creative Labs and the AdLib audio card from AdLib Multimedia. Table IX lists the ISA Bus SoundBlaster Pro registers. Table X
lists the ISA Bus AdLib registers. Because the AdLib registers are a subset of those in the SoundBlaster card, you can find complete
information on using both of these registers in the Developer Kit for SoundBlaster Series, 2nd ed. © 1993, Creative Labs, Inc.,
1901 McCarthy Blvd., Milpitas, CA 95035.
REV. 0
GPSP
PD3D
3D
PTB
PDP
PDA
PAA
PIR
PIW
CPD
For Power-up, software should poll the [SSBASE+0] CRY bit for “1” before writing or reading any logical device.
Test register. Should never be written or read under normal operation.
[45] VERSION ID
[46] RESERVED
7
7
Game Port Speed Select. Selects the operating speed of the game port.
0
1
Power-Down 3D. Turns off internal Phat™ Stereo circuitry.
0
1
3D Analog Mixer Bypass. Allows the analog output of the D/A converters to bypass the Phat™ Stereo Circuit. Enables
ultimate flexibility for mixing and any combination of 3D enhanced analog signals or non-3D enhanced signals with
the DAC output.
0
1
Power-Down Time Base. 1 = timer set to 100 ms, 0 = timer set to 10 s.
Power-down count reload on DSP Port enabled; “1” = Reload count if DSP Port enabled. DSP Port is enabled when
Slot 0 of SDI of the DSP Serial Port Input is Alive (Bit 7 = 1).
Power-down count reload on Digital Activity; “1” = Reload count on Digital Activity. Digital Activity is defined as any
activity on (I
Power-down count reload on Analog Activity; “1” = Reload count on Analog Activity. Analog Activity is defined as any
analog input unmuted (LINE, CD, SYNTH, MIC, MONO) or MASTER VOLUME unmuting.
Power-down count reload on ISA Read; “1” = Reload count on ISA read. ISA Read is defined as a read from any active
logical device inside the AD1821.
Power-down count reload on ISA Write; “1” = Reload count on ISA write. ISA Write defined as a write to any active
logical device inside the AD1821.
Chip Power-Down
1
0
6
6
Register Name
Music0: Address (w), Status (r)
Music0: Data (w)
Music1: Address (w)
Music1: Data (w)
Mixer Address (w)
Mixer Data (w)
Reset (w)
Music0: Address (w)
Music0: Data (w)
Input Data (r)
Status (r), Output Data (w)
Status (r)
Slow Game Port
Fast Game Port
On
Off
3D Phat™ Stereo Enabled for DAC Output
3D Phat™ Stereo Bypassed for DAC Output
Power-Down;
Power-Up
5
5
VER [15:8]
2
S0, I
RES
4
4
2
S1, FM or PLAYBACK).
3
3
Table IX. SoundBlaster Pro ISA Bus Registers
2
2
1
1
0
0
–37–
ISA Bus Address
0x(SB Base) Relocatable in range 0x010 – 0x3F0
0x(SB Base+1)
0x(SB Base+2)
0x(SB Base+3)
0x(SB Base+4)
0x(SB Base+5)
0x(SB Base+6)
0x(SB Base+8)
0x(SB Base+9)
0x(SB Base+A)
0x(SB Base+C)
0x(SB Base+E)
7
7
6
6
5
5
VER [7:0]
RES
4
4
3
3
DEFAULT = [0x0000]
DEFAULT = [0x0000]
2
2
AD1821
1
1
0
0