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VNC2-48Q1B-TRAY 参数 Datasheet PDF下载

VNC2-48Q1B-TRAY图片预览
型号: VNC2-48Q1B-TRAY
PDF下载: 下载PDF文件 查看货源
内容描述: [Vinculum-II Embedded Dual USB Host Controller IC]
分类和应用:
文件页数/大小: 88 页 / 2234 K
品牌: FTDI [ FUTURE TECHNOLOGY DEVICES INTERNATIONAL LTD. ]
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Datasheet  
Vinculum-II Embedded Dual USB Host Controller IC  
Version 1.7  
Document No.: FT_000138 Clearance No.: FTDI#143  
6.3.4 Half Duplex, 3 pin  
The 3 pin half duplex mode eliminates the MISO pin from the protocol. This means that status bytes need  
to be sent on the MOSI pin. Again the Master initiates a transfer by asserting SS# and sending out a  
command byte. The Slave sends status back to the Master. If a write has been requested and the status  
indicates that the Slave can accept data, MOSI should be changed to an output again and data will be  
sent fromMaster to Slave.  
Following this data, the Slave will send a further status byte if SS# remains active. If the status indicates  
that more data can be written, the next data byte can be sent to the Slave and this process continues  
until SS# is de-asserted. Figure 6.10 is an example of this:  
Master to Slave Slave to Master Master to Slave Slave to Master  
Master to Slave  
SS#  
MOSI  
8 bit CMD  
STATUS  
W0  
STATUS  
W1  
Figure 6.10 Half Duplex 3-pin Data Master Write  
Data reads are similar expect that after the command byte all data transfer is from Slave to Master.  
Figure 6.11 is an example of this:  
Master to Slave  
Slave to Master  
SS#  
MOSI  
8 bit CMD  
STATUS  
R0  
STATUS  
R1  
Figure 6.11 Half Duplex 3-pin Data Master Read  
46  
Copyright © Future Technology Devices International Limited  
 
 
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