VNC2-32L1B-REEL FTDI, Future Technology Devices International Ltd, VNC2-32L1B-REEL Datasheet - Page 46

• Manufacturer Part Number: VNC2-32L1B-REEL
• Description: IC USB HOST VINCULUM-II 32LQFN
• Manufacturer: FTDI, Future Technology Devices International Ltd
• Series: Vinculum-IIr

Specifications of VNC2-32L1B-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-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 768-1051-2; VNC2-32L1A-REEL

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.
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.
Figure 6-9 Half Duplex Data Master Read
MOSI
MOSI
MISO
MISO
SS#
SS#
Master to Slave
Copyright © 2010 Future Technology Devices International Limited
8 bit CMD
8 bit CMD
STATUS
STATUS
VINCULUM-II EMBEDDED DUAL USB HOST CONTROLLER IC Datasheet
STATUS
STATUS
W0
R0
Slave to Master
STATUS
STATUS
W1
R1
Document No.: FT_000138
Clearance No.: FTDI#
STATUS
STATUS
W2
R2
Version -
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1.2
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