AD1821 Analog Devices, AD1821 Datasheet - Page 20

• Manufacturer Part Number: AD1821
• Manufacturer: Analog Devices

AD1821
Figure 14 illustrates the flexibility of the DSP Serial Port interface. This port can monitor or intercept any of the digital streams man-
aged by the AD1821. Any ADC or DAC data stream can be intercepted by the port, shipped to an external DSP or ASIC manipu-
lated, and returned to any DAC summing path or to the ADC.
ISA INTERFACE
AD1821 Chip Registers
Table II, Chip Register Diagram, details the AD1821 direct register set available from the ISA Bus. Prior to any accesses by the host,
the PC I/O addressable ports must be configured using the Plug and Play Resources.
AUDIO
DAC
Register Type-Register Name
Plug and Play
Sound System Codec
SoundBlaster Pro
PGA
ADDRESS
WRITE_DATA
READ_DATA
CODEC REGISTERS
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)
MODEM
AUDIO/
ADC
M
M
M
M
A
A
A
A
SERIAL PORT INTERFACE
Table II. Chip Register Diagram
Figure 14. DSP Serial Port
Register PC I/O Address
0x279
0xA79
Relocatable in Range 0x203 – 0x3FF
0x(SS Base+0 – SS Base+15)
Relocatable in Range 0x100 – 0x3FF
See Table V
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 or 7)
0x(SB Base+8)
0x(SB Base+9)
0x(SB Base+A or +B)
0x(SB Base+C or +D)
0x(SB Base+E or +F)
–20–
FORMAT
FORMAT
SYNTHESIZER
MUSIC
FIFO
FIFO
PLUG AND PLAY
I
I
2
2
INTERFACE
S SERIAL PORT (0)
S SERIAL PORT (1)
PARALLEL
ISA BUS
REV. 0