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CSTCR6M00G15 参数 Datasheet PDF下载

CSTCR6M00G15图片预览
型号: CSTCR6M00G15
PDF下载: 下载PDF文件 查看货源
内容描述: USB UART ( USB - 串行) I.C. [USB UART ( USB - Serial) I.C.]
分类和应用:
文件页数/大小: 26 页 / 560 K
品牌: FTDI [ FUTURE TECHNOLOGY DEVICES INTERNATIONAL LTD. ]
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FT232BQ USB UART ( USB - Serial) I.C.  
Programmable Receive Buffer Timeout  
to the device and they will be sequentially sent to  
the interface at a rate controlled by the prescaler  
setting. As well as allowing the device to be used  
stand-alone as a general purpose IO controller for  
example controlling lights, relays and switches,  
some other interesting possibilities exist. For  
instance, it may be possible to connect the device  
to an SRAM configurable FPGA as supplied by  
vendors such as Altera and Xilinx. The FPGA  
device would normally be un-configured (i.e. have  
no defined function) at power-up. Application  
software on the PC could use Bit Bang Mode to  
download configuration data to the FPGA which  
would define its hardware function, then after the  
FPGA device is configured the FT232BQ can  
switch back into UART interface mode to allow  
the programmed FPGA device to communicate  
with the PC over USB. This approach allows a  
customer to create a “generic” USB peripheral  
who’s hardware function can be defined under  
control of the application software. The FPGA  
based hardware can be easily upgraded or  
In the previous device, the receive buffer timeout  
used to flush remaining data from the receive  
buffer was fixed at 16ms timeout. This timeout is  
now programmable over USB in 1ms increments  
from 1ms to 255ms, thus allowing the device to  
be better optimised for protocols requiring faster  
response times from short data packets.  
TXDEN Timing fix  
TXDEN timing has now been fixed to remove the  
external delay that was previously required for  
RS485 applications at high baud rates. TXDEN  
now works correctly during a transmit send-break  
condition.  
Relaxed VCC Decoupling  
The 2nd generation devices now incorporate a level  
of on-chip VCC decoupling. Though this does  
not eliminate the need for external decoupling  
capacitors, it significantly improves the ease of  
PCB design requirements to meet FCC, CE and  
other EMI related specifications.  
totally changed simply by changing the FPGA  
configuration data file. Application notes, software  
and development modules for this application area  
will be available from FTDI and other 3rd parties.  
Improved PreScaler Granularity  
The previous version of the Prescaler supported  
division by (n + 0), (n + 0.125), (n + 0.25) and  
(n + 0.5) where n is an integer between 2 and  
16,384 (214). To this we have added (n + 0.375),  
(n + 0.625), (n + 0.75) and (n+ 0.875) which can  
be used to improve the accuracy of some baud  
rates and generate new baud rates which were  
previously impossible (especially with higher baud  
rates).  
PreScaler Divide By 1 Fix  
The previous device had a problem when the  
integer part of the divisor was set to 1. In the 2nd  
generation device setting the prescaler value to 1  
gives a baud rate of 2 million baud and setting it  
to zero gives a baud rate of 3 million baud. Non-  
integer division is not supported with divisor values  
of 0 and 1.  
Bit Bang Mode  
The 2nd generation device has a new option  
referred to as “Bit Bang” mode. In Bit Bang mode,  
the eight UART interface control lines can be  
switched between UART interface mode and an  
8-bit Parallel IO port. Data packets can be sent  
DS232BQ Version 1.8  
© Future Technology Devices Intl. Ltd. 2005  
Page 3 of 25  
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