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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： | 7/43頁 |
| 文件大小： | 678K |
| 代理商： | UDA1326PS |
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Philips
Semiconductors, Inc.
USB-CODEC UDA1325PS
Technical Report
DML98022
7
Figure 2-2
Basic boot-sequence of the USB - CODEC
The USB-CODEC can only be used as a self-powered device as defined in the USB Specification. The
transitions from/to the states ‘power-
-down’ and ‘suspended’ will be handled at the hardware level.
After the hardware power-up phase, the firmware initializes the USB-CODEC components. Initialization is done
in a specific order:
To load data from an external I2C-EEPROM, at initialization time, the internal
μ
Controller will send a read request
to I2C slave address A0h. It will attempt to read the device’s first two byte locations and compare these bytes
5h AAh”. If a match occurs, it assumes that this I2C device is an EEPROM and that it is
dedicated to the USB-CODEC. It will then read the stored configuration data. The exact structure of this
EEPROM configuration data, is given in the datasheet. For more details about this configuration map, please
read chapter 3.
The circuitry connected to the General Purpose Input/Output Pins serves a number of different purposes and will
be described in more detail later in this chapter. For now (or for the simplest case) it will be assumed that they
are simple pull-up/ pull-down resistors that determine the level. A detailed explanation will follow in chapter 2.
Bus enumeration
Connected
Read Data
Power On
I2C - Bus
GP5
Disconnected
External
initialisation
Initialise
USB-CODEC,
PSIE MMU,
ASR, ADAC
min. 10[ms]
internal
initialisation
USB - CODEC
Bus Reset
No ACKNOWLEDGE:
no EEPROM; Read the diodes
ACKNOWLEDGE:
Read in EEPROM values
No external controller
Connected
RESET
USB-
CODEC
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