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參數資料
| 型號： | UDA1326PS |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | Codec |
| 英文描述： | USB AUDIO-CODEC(通用串行總線音頻編解碼器) |
| 中文描述： | USB音頻編解碼器（通用串行總線音頻編解碼器） |
| 文件頁數： | 6/43頁 |
| 文件大小： | 678K |
| 代理商： | UDA1326PS |
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Philips
Semiconductors, Inc.
USB-CODEC UDA1325PS
Technical Report
DML98022
6
2.
At Startup/Power-on, the USB-CODEC completes a boot cycle during which all its internal registers are loaded
and all pins and settings are configured. There are a total of 5 different configurations that a user can choose
from at startup time. Four of these configurations are built into the UDA1325PS firmware.
They can be used
without any change
IF YOU ARE THE LEGAL OWNER
of the internal map. You are not allowed to use any of
the internal maps, if you are not the legal owner of the map. In that case, you must use an external configuration
!
If only the name descriptor needs to be changed this can be done by changing some system files. This has the
advantage that there is no need for an I2C-EEPROM (see section 4.1 of this application note). If you don’t want
to do that or you want another configuration, you can use the fifth configuration. At startup this fifth configuration
can be loaded using the common I2C Bus protocol from an external 1024 or
The USB-CODEC has a number of General Purpose Input / Output pins that can serve various different
purposes. These will be described in detail in the following chapters. For now it is only necessary to notice that
two of the GPIO pins (GP3 and GP4) are used to select one of the four internal configurations (in case there is
no dedicated I2C EEPROM present).
The basic boot sequence of the USB-CODEC is shown in Figure 2-1:
System Startup
-EEPROM (if present).
11 01 10 00
Power ON
Send I2C
Sequence
I2C response from
EEPROM
Read levels at Pins GP3 and GP4
Int. Config. 3
Int. Config. 2
Int. Config. 1
Int. Config. 0
No
Yes
Load Ext.
Config. from
EEPROM
Enable USB connection
Regular Operation ...
Recognition pattern
$55 and $AA
No
Yes
Figure 2-1
Boot Sequence Flow Chart
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