AD1816 Analog Devices, AD1816 Datasheet - Page 43

• Manufacturer Part Number: AD1816
• Description: Single Chip Plug And Play Multimedia Audio Subsystem
• Manufacturer: Analog Devices

AD1816A FLAG BYTES
The AD1816A has four flag bytes that are used as shown below:
(*) AD1816-compatible setting.
Byte 0
MODEM_EN
XTRA_EN
SUPER_EN
I
XTRA_HV
The three MSBs in the first byte of the AD1816A EEPROM are used to verify that the EEPROM data is valid. The bits are com-
pared to the values shown; if a mismatch is found, the EEPROM will be ignored. The internal ROM will be used to perform PnP
enumeration, and the MODEM and XTRA logical devices will not be available. Hardware volume will be enabled on the I
port. The SPORT is disabled.
Byte 1
IRQSEL12_13
IRQSEL3_9
RSTB_EN
REV. A
2
S0_HV
7
1
7
Program to one to enable the modem logical device. This logical device has an I/O range and an IRQ.
The I/O range has the following requirements:
– Length of eight bytes
– Alignment of eight bytes
– 16-bit address decode
Program to zero to enable I
Program to one to enable the XTRA logical device. This logical device has an I/O range, an optional
IRQ, and an optional DMA. The I/O range has the following requirements:
– Length of 1 to 16 bytes, selectable by XTRASZ0[3:0]
– Alignment of 1 to 16 bytes, matches length
– 16-bit address decode
A second I/O range is available (see XTRA_CS). Program to zero to enable the DSP serial port (XTRA_HV
must also be zero).
Program to one to merge the XTRA and modem logical devices. If this bit is set to one, XTRA_EN and IRQ_EN
must be set to one and MODEM_EN must be set to zero. The combined device has up to two I/O ranges, two
IRQs and one DMA. The two I/O ranges are both taken from the XTRA device; the modem I/O range is disabled.
The first IRQ is the XTRA device IRQ, the second is the modem IRQ. Program to zero for distinct modem and
XTRA devices. (*)
Program to one to enable hardware volume inputs on the I
Program to one to enable hardware volume inputs on the DSP serial port pins. Do not enable both XTRA_HV
and I
Program to one to enable IRQ 13.
Program to zero to enable IRQ 12.
IRQ_EN must be one and MODEM_EN must be zero, or this bit has no effect.
Program to one to enable IRQ 9.
Program to zero to enable IRQ 3. (*)
MODEM_EN or IRQ_EN must be one, or this bit has no effect.
Program to one to enable an active-low RESET output on the XCTRLO pin.
Program to zero to enable XCTRL0/PCLKO. (*)
RESERVED
6
0
6
2
S0_HV. Program to zero to enable the XTRA device DMA or the DSP serial port.
5
0
5
2
S Port 1 (SUPER_EN and IRQ_EN must also be zero).
XTRA_HV
4
4
0
–43–
I
2
S0_HV
3
3
0
2
S port 0 pins.
SUPER_EN
RSTB_EN
2
2
IRQSEL3_9
XTRA_EN
1
1
IRQSEL12_13
MODEM_EN
AD1816A
0
0
2
S0