參數(shù)資料
型號： EVAL-ADAU1446EBZ
廠商： Analog Devices Inc
文件頁數(shù)： 21/92頁
文件大小： 0K
描述： BOARD EVAL FOR ADAU1446
標準包裝： 1
系列： SigmaDSP®
主要目的： 音頻，音頻處理
嵌入式： 是，DSP
已用 IC / 零件： ADAU1446
主要屬性： 單芯片多通道 28/56 位音頻 DSP
次要屬性： I²C & SPI 接口
已供物品： 板，軟件
ADAU1445/ADAU1446
Rev. A | Page 28 of 92
Self-Boot
On power-up, the ADAU1445/ADAU1446 can load a program
and a set of parameters that are saved in an external EEPROM.
Combined with the auxiliary ADC and the multipurpose pins,
this can potentially eliminate the need for a microcontroller in a
simple audio system. The self-boot sequence is accomplished by
the ADAU1445/ADAU1446 acting as masters on the I2C bus on
startup, which occurs when the SELFBOOT pin is set high. The
ADAU1445/ADAU1446 cannot self-boot in SPI mode.
The maximum necessary EEPROM size is 40,960 bytes, or
40 kB. This much memory is only needed if the program RAM
(4096 × 6 bytes) and parameter RAM (4096 × 4 bytes) are each
completely full.
A self-boot operation is triggered on the rising edge of RESET
when the SELFBOOT pin is set high, and it occurs after 10 ms
when the PLL has locked. The ADAU1445/ADAU1446 read the
program, parameter, and register data from the EEPROM. After
the ADAU1445/ADAU1446 have finished self-booting, additional
messages can be sent to the ADAU1445/ADAU1446 on the I2C
bus, although this typically is not necessary in a self-booting
application. The I2C device address for the ADAU1445/ADAU1446
is 0x68 for a write and 0x69 for a read in this mode. The ADDRx
pins have different functions when the chip is in this mode;
therefore, the settings on them are ignored.
The ADAU1445/ADAU1446 are masters on the I2C bus during
a self-boot operation. Care should be taken that no other device
on the I2C bus tries to perform a write operation during self-
booting. The ADAU1445/ADAU1446 generate SCL at 8 × fs;
therefore, when fs,NORMAL is 48 kHz, SCL runs at 384 kHz. SCL
has a duty cycle of in accordance with the I2C specification.
The ADAU1445/ADAU1446 read from EEPROM Chip Address
0xA1. The LSBs of the addresses of some EEPROMs are pin con-
figurable; in most cases, these pins should be tied low to set this
address. SigmaStudio writes to the EEPROM at Address 0xA0.
EEPROM Format
The EEPROM data contains a sequence of messages. Each
discrete message is one of the four types defined in Table 15.
Each message consists of a sequence of one or more bytes. The
first byte identifies the message type. Bytes are written MSB
first. Most messages are block write (0x01) types, which are
used for writing to the ADAU1445/ADAU1446 program RAM,
parameter RAM, and control registers.
The body of the message following the message type should
start with a byte indicating message length and then include a
byte indicating the chip address. Following this is always a
2-byte register or memory address field, as with all other
control port transactions.
SigmaStudio is capable of generating the EEPROM data necessary
to self-boot the ADAU1445/ADAU1446, using the function
called write latest compilation to E2PROM. This function can
be accessed by right-clicking the ADAU1445/ADAU1446 IC in
the hardware configuration window.
Table 14. Functions of the Control Port Pins
Pin
I2C Mode
SPI Mode
Self-Boot
SCL/CCLK
SCL—input
CCLK—input
SCL—output
SDA/COUT
SDA—open collector output
COUT—output
SDA—open collector output
ADDR1/CDATA
ADDR1—input
CDATA—input
Unused input—tie to ground or power
CLATCH
Unused input—tie to ground or power
CLATCH—input
Unused input—tie to ground or power
ADDR0
ADDR0—input
Unused input—tie to ground or power
Table 15. EEPROM Message Types
Message ID
Message Type
Following Bytes
0x00
End
None
0x01
Write
One byte indicating message length (including chip address and
subaddress), one byte indicating chip address, two bytes
indicating subaddress, and an appropriate number of data bytes
0x02
Delay
Two bytes for delay
0x03
No op
None
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