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參數(shù)資料
| 型號(hào)： | ZR36506 |
| 英文描述： | Fast Recovery Rectifier Diodes |
| 中文描述： | 外圍芯片 |
| 文件頁數(shù)： | 22/99頁 |
| 文件大?。?/td> | 452K |
| 代理商： | ZR36506 |
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Zoran ZR36506 USBV ision – Datasheet
Zoran Proprietary and Confidential
3-2
General Architecture
The ZR36506 has 5 USB End-Points located on chip:
§
End-Point #0: This is the Descriptors and Configuration End-Point, which is required by the
USB standard.
§
End-Point #1: This is the control end-point used to access the Register Bank. The host
computer uses these registers to control the ZR36506 and the camera.
§
End-Point #2: This End-Point produces and sends the digital video data to the host
computer. It uses 0.5 to 7.5 Mbit/s of the USB bandwidth, depending on the amount of
bandwidth available to the camera.
§
End-Point #3: This End-Point sends the input digital audio data to the host computer. It uses
64 to 512 Kbit/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 2 Mbit/s of the USB bandwidth, depending on the external source of data.
The ZR36506 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.
Camera manufacturers may define new configurations (which combine only the available End-
Points), using the 8-pin serial EEPROM. Additionally, string descriptors may be added (in
multiple languages) to define such parameters as the camera vendor's name, product name, serial
number, etc. The USB standard regards these features as optional.
The ZR36506 supports the USB Power-Management-Protocol. The camera and external circuits
may be power-controlled by their vendor-specific software drivers, via serial Data/Clock and I/O
ports. The PWR_DWN output pin may also be used to turn off the local power supply to these
external circuits (refer to ZR36506 application notes). The ZR36506 uses a single 12 MHz
crystal to derive all of its internal clock sources. Power management also involves switching of
internal clock sources, which are not in use in certain modes of operation. This further reduces
the device’s power consumption.
The ZR36506 has two sources of Reset control: The Power-On-Reset that comes from a
dedicated input pin (RESIN), and the USB-Reset command received from the host computer.
Both Reset sources produce a single Reset signal inside the ZR36506, which initializes the
ZR36506. It is assumed that a Power-On-Reset is applied to the RESIN pin before any USB
transaction is sent to the ZR36506 by the host. This is required so that the Serial-Interface-
Engine inside the ZR36506 be able to receive any valid host command that will follow
(including a USB-Reset command).
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