AD1816AJS datasheet(43/52 Pages) AD

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AD1816A

–43–

REV. A

AD1816A FLAG BYTES

The AD1816A has four flag bytes that are used as shown below:

(*) AD1816-compatible setting.

Byte 0

76543210

100

XTRA_HV

2S0_HV

SUPER_EN

XTRA_EN

MODEM_EN

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

2S Port 1 (SUPER_EN and IRQ_EN must also be zero).

XTRA_EN

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).

SUPER_EN

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. (*)

2S0_HV

Program to one to enable hardware volume inputs on the I

2S port 0 pins.

XTRA_HV

Program to one to enable hardware volume inputs on the DSP serial port pins. Do not enable both XTRA_HV

and I

2S0_HV. Program to zero to enable the XTRA device DMA or the DSP serial port.

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

2S0

port. The SPORT is disabled.

Byte 1

76543210

RESERVED

RSTB_EN

IRQSEL3_9

IRQSEL12_13

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.

IRQSEL3_9

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.

RSTB_EN

Program to one to enable an active-low RESET output on the XCTRLO pin.

Program to zero to enable XCTRL0/PCLKO. (*)

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