参数资料
| 型号： | HW-SPAR3-SK-UNI-G |
| 厂商： | Xilinx Inc |
| 文件页数： | 28/64页 |
| 文件大小： | 0K |
| 描述： | KIT STARTER SPARTAN-3 |
| 产品变化通告： | Adapter Replacement 23/May/2008 Development Systems Discontinuation 22/Jun/2009 |
| 标准包装： | 1 |
| 系列： | Spartan-3 |
| 类型： | FPGA 配置 |
| 适用于相关产品： | Spartan-3 |
| 所含物品： | 面板、缆线、软件、数据表和用户手册 |
| 其它名称： | 122-1521 |
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Chapter 6: PS/2 Mouse/Keyboard Port
bidirectional keyboard communications. As shown in Figure 6-2 , the attached keyboard or
mouse writes a bit on the data line when the clock signal is High, and the host reads the
data line when the clock signal is Low.
Table 6-2:
PS/2 Bus Timing
Symbol
T CK
T SU
T HLD
Parameter
Clock High or Low time
Data-to-clock setup time
Clock-to-data hold time
Edge 0
T CK T CK
Min
30 μ s
5 μ s
5 μ s
Edge 10
Max
50 μ s
25 μ s
25 μ s
CLK (PS2C)
DATA (PS2D)
T SU
T HLD
'0' start bit
'1' stop bit
UG130_c6_02_042404
Figure 6-2: PS/2 Bus Timing Waveforms
The following site contains additional information on the PS/2 bus protocol:
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PS/2 Mouse/Keyboard Protocol
Keyboard
The keyboard uses open-collector drivers so that either the keyboard or the host can drive
the two-wire bus. If the host never sends data to the keyboard, then the host can use simple
input pins.
A PS/2-style keyboard uses scan codes to communicate key press data. Nearly all
keyboards in use today are PS/2 style. Each key has a single, unique scan code that is sent
whenever the corresponding key is pressed. The scan codes for most keys appear in
If the key is pressed and held, the keyboard repeatedly sends the scan code every 100 ms or
so. When a key is released, the keyboard sends a “F0” key-up code, followed by the scan
code of the released key. The keyboard sends the same scan code, regardless if a key has
different “shift” and “non-shift” characters and regardless whether the Shift key is pressed
or not. The host determines which character is intended.
Some keys, called extended keys, send an “E0” ahead of the scan code and furthermore,
they may send more than one scan code. When an extended key is released, a “E0 F0” key-
up code is sent, followed by the scan code.
28
Spartan-3 FPGA Starter Kit Board User Guide
UG130 (v1.2) June 20, 2008
相关PDF资料 |
PDF描述 |
|---|---|
| HW-SPAR3E-DISP-DK-UNI-G | KIT DEV SPARTAN3E DISPLAY |
| HW-SPAR3E-SK-UK-G | KIT STARTER SPARTAN-3E |
| HW-USB-II-G | PLATFORM CABLE USB II |
| HW-USBN-2A | ACCY USB DOWNLOAD CABLE STD SPD |
| HW-V4-ML401-USA | EVALUATION PLATFORM VIRTEX-4 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| HW-T126 | 制造商:IDEC Corporation 功能描述:120V/6V Xfrmr w/G Trmnls |
| HW-T246 | 制造商:IDEC CORPORATION 功能描述:240V/6V Xfrmr w/G Trmnls |
| HWT9/17 | 制造商:Talco Tool Storage 功能描述:9 TRAY CANTILEVER TOOLBOX |
| HW-USB-1A | 功能描述:程序设计器配件 ispDOWNLOAD Cable - USB CONNECTION RoHS:否 制造商:Lattice 产品:ispDOWNLOAD Cables 用于:In-system Programming |
| HW-USB-2A | 功能描述:程序设计器配件 ispDOWNLOAD Cable USB Connection RoHS:否 制造商:Lattice 产品:ispDOWNLOAD Cables 用于:In-system Programming |
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