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ZR36504

Video & Audio Interface solution via USB

Unspecified 

ZORAN Corporation

USBvision II Data Decoder

ZR36505 Data Sheet

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

November-99

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