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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  
6.3.3 Half Duplex, 4 pin  
In half duplex mode, the MOSI signal is shared for both Master to Slave and Slave to Master  
communications. When using 4 pins, the MISO signal carries the status bits. The Master initiates data  
write transfer, this by asserting SS# and then sending out a command byte. This has the same format as  
that shown in Figure 6.7. The Slave sends status during this command phase and if this indicates that  
the Slave can accept data the Master will follow this up with a byte of write data. If the status continues  
to indicate that more data can be written, a whole stream of data can be written following one single  
command. The operation completes whenthe Master raises SS# again. Figure 6.8 is an example of this.  
SS#  
MOSI  
MISO  
8 bit CMD  
STATUS  
W0  
W1  
W2  
STATUS  
STATUS  
STATUS  
Figure 6.8 Half Duplex Data Master Write  
Data reads are similar, apart from the MOSI pin changing from Slave input to Slave output after the  
command phase. Figure 6.9 is an example. In this diagram, the Master drives the command while the  
Slave returns with status. Then the MOSI buffers are turned round and a stream of read data is sent from  
the Slave to the Master on the MOSI signal.  
Master to Slave  
Slave to Master  
SS#  
MOSI  
MISO  
8 bit CMD  
STATUS  
R0  
R1  
R2  
STATUS  
STATUS  
STATUS  
Figure 6.9 Half Duplex Data Master Read  
45  
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