參數(shù)資料
型號: TW2802
廠商: Electronic Theatre Controls, Inc.
英文描述: TW2802/4 Multiple Video Decoder For Security Applications
中文描述: TW2802 / 4多路視頻解碼器的安全應用
文件頁數(shù): 26/80頁
文件大?。?/td> 946K
代理商: TW2802
www.techwellinc.com
Preliminary
TW2804/TW2802 Multiple Video Decoder
Techwell, Inc.
Datasheet Rev. 2.4
09/09/2003
26
Host Interface
The TW280X provides I2C serial and parallel interfaces that can be selected by HSPB pin.
When HSPB is low, the parallel interface is selected, the serial interface for high. Some of the
interface pins serve a dual purpose depending on the working mode. The pins HALE and
HDAT[7] in parallel mode become SCLK and SDAT pins in serial mode respectively. Each
interface protocol is shown in the following figure.
Table 5 Pin Assignment for Serial/Parallel Interface
Pin Name
Serial Mode
HSPB
HIGH
HALE
SCLK
HRDB
Not Used
HWRB
Not Used
HCSB
Slave Address[0]
HDAT[0]
Not Used
HDAT[1]
Slave Address[1]
HDAT[2]
Slave Address[2]
HDAT[3]
Slave Address[3]
HDAT[4]
Slave Address[4]
HDAT[5]
Slave Address[5]
HDAT[6]
Slave Address[6]
HDAT[7]
SDAT
Parallel Mode
LOW
AEN
RENB
WENB
CSB
PDATA[0]
PDATA[1]
PDATA[2]
PDATA[3]
PDATA[4]
PDATA[5]
PDATA[6]
PDATA[7]
Serial Interface
HDAT[6:1] and HCSB pins define slave address. Therefore, any slave address can be assigned
for full flexibility. TW2804 also supports auto index increments in write/read mode if the data are
in sequential order.
MSB
LSB
MSB
LSB
MSB
LSB
Start
Slave address
R/WB
Ack
Index
Ack
Data
Ack
Stop
SDAT
SCLK
Fig 16 Write mode in Serial Interface
MSB
LSB
MSB
LSB
Start
Slave address
R/WB
Ack
Index
Ack
Stop
SDAT
SCLK
MSB
LSB
MSB
LSB
Start
Slave address
R/WB
Ack
Data
NoAck
Stop
“0”
“1”
Fig 17 Read mode in Serial Interface
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