VNC2-32Q1B-REEL FTDI, Future Technology Devices International Ltd, VNC2-32Q1B-REEL Datasheet - Page 48

• Manufacturer Part Number: VNC2-32Q1B-REEL
• Description: IC USB HOST VINCULUM-II 32QFN
• Manufacturer: FTDI, Future Technology Devices International Ltd
• Series: Vinculum-IIr

Specifications of VNC2-32Q1B-REEL

• Mfg Application Notes: 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
• Controller Type: USB 2.0 Controller
• Interface: SPI Serial, USB, UART
• Voltage - Supply: 1.62 V ~ 1.98 V
• Current - Supply: 25mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-VQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 768-1050-2; VNC2-32Q1A-REEL

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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mosi
miso
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clk
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Document No.: FT_000138
Clearance No.: FTDI#
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Tx Shift Register
SPI Slave
Rx Shift Register
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