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): 61/74頁
文件大?。?/td> 298K
代理商: ZR36504
ZORAN Corporation
USBvision II Data Decoder
ZR36505 Data Sheet
November-99
Page 61 of 61
EEPROM Control Signals
The SCL/PWR0 and SDA/EEPROM pins of the ZR36504 are the EEPROM control
signals. The SCL/PWR0 is used as the clock output, and the SDA/EEPROM signal is used
as the data I/O.
During Reset operation, the ZR36504 samples its SDA/EEPROM pin to determine if an
external EEPROM is connected. If an external EEPROM does not exist
(SDA/EEPROM='0'), the ZR36504 automatically uses its internal ROM for USB
descriptors; in this case, the ZR36504 relates to hard-coding of the pins SCL/PWR0 and
PWR1 to determine the current-consumption parameter for the Configuration-Descriptor.
The following table summarizes these two modes of operation:
Internal ROM mode
SDA/EEPROM pin connected to GND
.
SCL/PWR0 and PWR1 pins are hard-coded to
determine device current consumption for
Configuration-Descriptor:
PWR1 SCL/PWR0 Current
===== ======== ======
0 0 200mA
0 1 300mA
1 0 400mA
1 1 500mA
The following timing diagram and table specify the EEPROM control waveforms that the
ZR36504 generates:
Start/Stop Timings
External EEPROM mode
SDA/EEPROM pin connected to 10K pull-up
resistor (3.3v to 5.0v).
External Serial 2K*8 EEPROM is connected:
SDA/EEPROM connected to Serial-Data (SDA).
SCL/PWR0 connected to Serial-Clock (SCL).
SCL
SDA
tSU:STA
tHD:STA
tSU:STO
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