ZR36504 Ver la hoja de datos (PDF) - Unspecified

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ZR36504

Video & Audio Interface solution via USB

Unspecified 

ZORAN Corporation

USBvision II Data Decoder

ZR36505 Data Sheet

2. Registers Bank (Control and Status)

The ZR36504 uses the End-Point #1 message pipe for ZR36504 and camera control. As a

bi-directional pipe, this channel allows the host computer to write contents to control

registers, as well as to read status registers. Also, the control registers can be read by host

computer to check their contents. All registers are byte-oriented.

The following section defines a USB vendor-specific protocol for Read and Write

operations applied to the ZR36504 register bank. This protocol uses a standard USB

Request of a vendor-specific type (defined in chapter 9.3 of USB standard rev.1.0) to

perform a data transfer of up to 8 bytes long to/from End-Point #1. A single Write operation

will write 1-8 concurrent bytes to the register bank, and a single Read operation will read 1-

8 concurrent bytes from the register bank. The USB Request Command always defines the

address of the first I/O -register to be read or write; this address is automatically incremented

by the ZR36504 for the following data bytes. The first byte of the USB Request Command

defines the direction of the data transfer (0x42 for Write, and 0xC2 for Read); the second

byte is a ZR36504 specific code - 0x33. The address of the first I/O-register in list is

defined in the wIndex parameter of the standard USB Request Command (these are bytes

4 & 5 of the command). All the other bytes in the Request Command are not important to

the ZR36504.

November-99

Page 18 of 18

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