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| 型號： | VNC1L-1A |
| 廠商： | Future Technology Devices International Ltd |
| 元件分類： | 總線控制器 |
| 中文描述： | UNIVERSAL SERIAL BUS CONTROLLER, PQFP48 |
| 封裝： | 7 X 7 MM, 0.50 MM PITCH, GREEN, LQFP-48 |
| 文件頁數(shù)： | 6/32頁 |
| 文件大?。?/td> | 672K |
| 代理商： | VNC1L-1A |
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Copyright 2009 Future Technology Devices International Limited
14
Document Reference No.: FT_000030
Vinculum VNC1L Embedded USB Host Controller IC Datasheet Version 2.02
Clearance No.: FTDI# 50
5 Firmware Control Interface
There are three firmware interface options for the command monitor on the combined control and data
interface. The command monitor interface options are UART, FIFO or SPI. The mode of operation is
selected using VNC1L pins 46 and 47.The pin connections used to select the mode of the interface are
shown in Table 5.1:
Pin No.
Mode
47
(ACBUS6)
46
(ACBUS5)
Pull-Up
UART
Pull-Up
Pull-Down
SPI
Pull-Down
Pull-Up
FIFO
Pull-Down
UART
Table 5.1 Combined Interface Selection
Important : Pins ACBUS5 and ACBUS6 should not be tied directly to GND or VCC.
Pins ACBUS5 and ACBUS6 should be pulled high or low using a resistor of around 47k. These pins are
read only at reset, but may then become outputs after the interface choice has been selected. When FIFO
mode is selected ACBUS5 will be used as an output by VNC1L Firmware.
5.1 UART Interface
When the data and control buses are configured in UART mode, the interface implements a standard
asynchronous serial UART port with flow control. The UART can support baud rates from 300baud to
1Mbaud.
Data transfer uses NRZ (Non-Return to Zero) data format consisting of 1 start bit, 7 or 8 data bits, an
optional parity bit, and one or two stop bits. When transmitting the data bits, the least significant bit is
transmitted first. Transmit and receive waveforms are illustrated in Figure 5.1 and Figure 5.2:
.
Figure 5.1 UART Receive Waveform
Figure 5.2 UART Transmit Waveform
Baud rate (default =9600 baud), flow control settings (default = RTS/CTS), number of data bits
(default=8), parity (default is no parity) and number of stop bits (default=1) are all configurable using
the firmware command interface. Please refer to http://www.ftdichip.com (or latest version).
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