VNC2-64Q1B FTDI, VNC2-64Q1B Datasheet - Page 48

• Manufacturer Part Number: VNC2-64Q1B
• Description: CONTROLLER, USB, VINCULUM II, 64QFN
• Manufacturer: FTDI

Specifications of VNC2-64Q1B

• Usb Type: Host Controller
• Usb Version: 2.0
• Data Rate: 12Mbps
• No. Of Ports: 2
• Supply Voltage Range: 1.62V To 1.98V, 2.97V To 3.63V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case: RoHS Compliant

6.3.5 Unmanaged Mode
The VNC2 SPI Slave also supports an unmanaged SPI mode. This is a simple data exchange between
Master and Slave. It operates in the standard 4 pin mode (SS#, CLK, MOSI and MISO) with all transfers
controlled by the SPI Master.
When the CPU wants to send data out of the SPI Slave it writes this into the spi_slave_data_tx register.
This will then be moved into the transfer shift register to wait for the SPI Master to request it. The SPI
Master will at some point assert SS# and start clocking data on MOSI with SCK. As this is shifted into the
transfer shift register, the SPI Slave will also be shifting data in the opposite direction on MISO. At the
end of the transfer the SPI Slave copies the received data from the shift register to spi_slave_data_rx as
seen in Figure 6-12.
Figure 6-12 Unmanaged Mode Transfer Diagram
0
0
1
1
SPI Master
Clk Div
2
2
Shift Register
Shift Register
SPI
Copyright © 2010 Future Technology Devices International Limited
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VINCULUM-II EMBEDDED DUAL USB HOST CONTROLLER IC Datasheet
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Document No.: FT_000138
Clearance No.: FTDI#
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