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參數(shù)資料
| 型號： | ZR36504 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Video & Audio Interface solution via USB |
| 中文描述： | 視頻 |
| 文件頁數(shù)： | 16/74頁 |
| 文件大小： | 298K |
| 代理商： | ZR36504 |
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ZORAN Corporation
USBvision II Data Decoder
ZR36505 Data Sheet
November-99
Page 16 of 16
The ZR36504 has 5 USB End-Points located on chip:
End-Point #0: This is the Descriptors and Configuration End-Point, which is mandatory
by the USB standard.
End-Point #1: This is the ZR36504 Register Bank; the host computer uses these
registers to control the ZR36504 and Camera.
End-Point #2: This End-Point produces and sends the digital Video Data to the host
computer. It uses 0.5 to 7.5Mb/s of the USB bandwidth, depending on how much
bandwidth is available for the camera.
End-Point #3: This End-Point sends the input digital Audio Data to the host computer.
It uses 64 to 512Kb/s of the USB bandwidth, depending on the audio quantization and
sampling rate.
End-Point #4: This End-Point sends the external Bulk Data input to the host computer.
It uses 0 to 2Mb/s of the USB bandwidth, depending on the external source of data.
The ZR36504 has a default set of USB Descriptors on-chip, which are automatically used
in absence of an external serial EEPROM (otherwise, all descriptors are read from the
EEPROM). The default descriptors allow the host computer to select one of 4 different
configurations to operate the camera. Most camera vendors can now use the ZR36504
without an external EEPROM. Also Vendor USB ID and Product ID are now pin-
programmable, and do not require to add an extra EEPROM.
Camera vendors need not use an external EEPROM for a low-cost solution. The ZR36504
and a 4Mb DRAM are sufficient for a fully USB standard compatible camera (this includes
the specific given Vendor ID, which identifies the camera with the specific manufacturer).
If an external 8-pin serial EEPROM is added, the camera manufacturer can define new
configurations (which combine only the available End-Points). Also, String-Descriptors can
be added (in multiple languages) to define the camera vendor's name, product name, serial-
number, and others; the USB standard regards these features as optional.
The ZR36504 supports USB Power-Management-Protocol. The Camera and external
circuits can be power-controlled by their vendor-specific software drivers, via serial
Data/Clock, and I/O ports; also, the PWR_DWN output pin can be used to turn off the
local power supply to these external circuits (refer to ZR36504 application notes). The
ZR36504 uses a single 12MHz crystal to derive all its internal clock sources. Power
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