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參數(shù)資料
| 型號(hào)： | FT8U232AM |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | U-UART - USB UltraBaud Data Transfer IC with RS232 / RS422 and CPU I/F Options |
| 中文描述： | U型UART的產(chǎn)品- USB UltraBaud數(shù)據(jù)傳輸集成電路的RS232 / RS422和處理器的I / f選項(xiàng) |
| 文件頁(yè)數(shù)： | 3/13頁(yè) |
| 文件大?。?/td> | 40K |
| 代理商： | FT8U232AM |
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Future Technology Devices Intl. FT8U232AM Preliminary Information Rev 0.8 – Subject to Change
FT8U232AM - FUNCTIONAL BLOCK DESCRIPTION
3.3V LDO Regulator
The 3.3V LDO Regulator generates the 3.3 volt reference voltage for driving the USB transceiver cell
output buffers. It requires an external decoupling capacitor to be attached to the 3V3OUT regulator
output pin.
USB Transceiver
The USB Transceiver Cell provides the USB 1.1 full-speed physical interface to the USB cable. The
output drivers provide 3.3 volt level slew rate control signalling, whilst a differential receiver and two single
ended receivers provide USB data in, SEO and USB Reset condition detection.
USB DPLL
The USB DPLL cell locks on to the incoming NRZI USB data and provides separate recovered clock and
data signals to the SIE block.
6MHz Oscillator
The 6MHz Oscillator cell generates a 6MHz reference clock input to the X8 Clock multiplier from an
external 6MHz crystal or ceramic resonator.
X8 Clock Multiplier
The X8 Clock Multiplier takes the 6MHz input from the Oscillator cell and generates a 12MHz reference
clock for the SIE, USB Protocol Engine and UART FIFO controller blocks. It also generates a 48MHz
reference clock for the USB DPPL and the Baud Rate Generator blocks.
Serial Interface Engine ( SIE )
The Serial Interface Engine ( SIE ) block performs the Parallel to Serial and Serial to Parallel conversion
of the USB data. In accordance to the USB 1.1 specification, it performs bit stuffing / un-stuffing and
CRC5 / CRC16 generation / checking on the USB data stream.
USB Protocol Engine
The USB Protocol Engine manages the data stream from the device USB control endpoint. It handles the
low level USB protocol ( Chapter 9 ) requests generated by the USB host controller and the commands
for controlling the functional parameters of the UART.
Dual Port TX Buffer ( 128 bytes )
Data from the USB data out endpoint is stored in the Dual Port TX buffer and removed from the buffer to
the UART transmit register under control of the UART FIFO controller.
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