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參數(shù)資料
| 型號： | VNC2-64Q1B-TRAY |
| 廠商： | FTDI, Future Technology Devices International Ltd |
| 文件頁數(shù)： | 40/88頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC USB HOST/DEVICE CTRL 64-QFN |
| 應用說明： | Vinculum-II IO Cell Description AppNote Vinculum-II Debug Interface Description AppNote Vinculum-II IO Mux Explained AppNote Vinculum-II PWM Example AppNote Migrating Vinculum Designs AppNote |
| 標準包裝： | 260 |
| 系列： | Vinculum-II |
| 控制器類型： | USB 2.0 控制器 |
| 接口： | USB，主機/設備配置，UART，SPI，PWM，閃存 256K，DMA 4CH |
| 電源電壓： | 1.62 V ~ 1.98 V |
| 電流 - 電源： | 25mA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 64-VFQFN 裸露焊盤 |
| 供應商設備封裝： | 64-QFN（8x8） |
| 包裝： | 托盤 |
| 其它名稱： | VNC2-64Q1A-TRAY VNC2-64Q1A-TRAY-ND |
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Copyright 2009-2011 Future Technology Devices International Limited
Datasheet
Vinculum-II Embedded Dual USB Host Controller IC
Version 1.5
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 when the Master raises SS# again. Figure 6.8 is an example of this.
SS#
MISO
MOSI
8 bit CMD
W0
W1
W2
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.
SS#
MISO
MOSI
8 bit CMD
R0
R1
R2
STATUS
Master to Slave
Slave to Master
Figure 6.9 Half Duplex Data Master Read
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