参数资料
| 型号： | DLP-USB245M-G |
| 厂商： | DLP Design Inc |
| 文件页数： | 2/15页 |
| 文件大小： | 0K |
| 描述： | MODULE USB-TO-TTL PARL FIFO CONV |
| 产品目录绘图： | DLP-USBxxxM-G |
| 标准包装： | 1 |
| 系列： | DLP-USB245M |
| 类型： | USB 至 FIFO |
| 连接器类型： | USB-B 至 DIL（双直插式） |
| 产品目录页面： | 635 (CN2011-ZH PDF) |
| 其它名称： | 813-1019 |
DLP-USB245M User Manual
GENERAL DESCRIPTION
The DLP-USB245M provides an easy cost-effective method
of transferring data to / from a peripheral and a host at up to
8 Million bits (1-Megabyte) per second. Its simple FIFO-like
design makes it easy to interface to any microcontroller or
microprocessor via IO ports.
To send data from the peripheral to the host computer
simply write the byte wide data into the module when TXE#
is low. If the (384 byte) transmit buffer fi lls up or is busy storing the previously written byte, the device takes TXE#
high in order to stop further data from being written until some of the FIFO data has been transferred over USB to the
host.
When the host sends data to the peripheral over USB, the device will take RXF# low to let the peripheral know that at
least one byte of data is available. The peripheral then reads the data until RXF# goes high indicating no more data is
available to read.
By using FTDI’s virtual COM Port drivers, the peripheral looks like a standard COM Port to the application software.
Commands to set the baud rate are ignored – the device always transfers data at its fastest rate regardless of the
application’s baud rate setting. The latest versions of the drivers are available for download from DLP Design’s
website at http://www.dlpdesign.com.
APPLICATION NOTES
USB devices transfer data in packets. If data is to be sent from the PC, a packet is built up by the application program
and is sent via the device driver to the USB scheduler. This scheduler puts a request onto the list of tasks for the USB
host controller to perform. This will typically take at least 1 millisecond to execute because it will not pick up the new
request until the next ‘ USB Frame’ (the frame period is 1 millisecond).
There is therefore a sizeable overhead (depending on your required throughput) associated with moving the data from
the application to the USB device. If data is sent ‘byte at a time’ by an application, this will severely limit the overall
throughput of the system as a whole.
It must be stressed that in order to achieve maximum throughput, application programs should send or receive data
using buffers and not individual characters.
Copyright ? DLP Design 2002
Page 2 of 15
相关PDF资料 |
PDF描述 |
|---|---|
| DLP-USB245R | MODULE USB-TO-PARL FIFO 18-DIP |
| DM163001 | BOARD DEMO PICDEM-1 |
| DM163004-LT | BOARD DEMO PICDEM.NET |
| DM163005 | KIT EVAL PIC16C432/433 LIN BUSS |
| DM163007 | PICDEM CAN-LIN 1 FOR 18C658/858 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DLP-USB245R | 功能描述:界面模块 USB-TO-PARALLEL FIFO INTERFACE MODULE RoHS:否 制造商:4D Systems 产品:Serial Converters 通道/端口数量: 数据速率: 接口类型:USB, UART 工作电源电压:3.3 V, 5 V 最大工作温度: |
| DLP-UT1 | 功能描述:工业温度传感器 TEMPERATURE SENSOR RoHS:否 制造商:Texas Instruments 准确性:1 C 功能:Temperature Sensing 25 摄氏度时的电阻: 温度范围:- 55 C to + 127 C 电源电流: 电源电压:2.7 V to 5.5 V |
| DLP-UTH8 | 功能描述:数据记录与采集 DLP SENSOR HUB RoHS:否 制造商:Lantronix 描述/功能:Analog device server 显示器类型:None 电流额定值: |
| DLPVA-100-F | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Low Frequency Voltage Amplifier |
| DLPVA-100-F-D | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Low Frequency Voltage Amplifier |
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