Datasheet

ADAU1701 Data Sheet
Rev. C | Page 34 of 52
CONTROL REGISTER DETAILS
2048 TO 2055 (0x0800 TO 0x0807)—INTERFACE
REGISTERS
The interface registers are used in self-boot mode to save
parameters that need to be written to the external EEPROM.
The ADAU1701 then recalls these parameters from the
EEPROM after the next reset or power-up. Therefore, system
parameters such as volume and EQ settings can be saved during
power-down and recalled the next time the system is turned on.
There are eight 32-bit interface registers, which allow eight 28-bit
(plus zero-padding) parameters to be saved. The parameters to
be saved in these registers are selected in the graphical
programming tools. These registers are updated with their
corresponding parameter RAM data once per sample period.
An edge, which can be set to be either rising or falling, triggers
the ADAU1701 to write the current contents of the interface
registers to the EEPROM. See the Self-Boot section for details.
The user can write directly to the interface registers after the
interface registers control port write mode (IFCW) in the DSP core
control register has been set. In this mode, the data in the registers
is written from the control port, not from the DSP core.
Table 32. Interface Register Bit Map
D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
0 0 0 0 IF27 IF26 IF25 IF24 IF23 IF22 IF21 IF20 IF19 IF18 IF17 IF16 0x0000
IF15 IF14 IF13 IF12 IF11 IF10 IF09 IF08 IF07 IF06 IF05 IF04 IF03 IF02 IF01 IF00 0x0000
Table 33.
Bit Name Description
IF[27:0] Interface register 28-bit parameter