参数资料
| 型号： | HW-SPAR3-SK-UNI-G |
| 厂商： | Xilinx Inc |
| 文件页数： | 30/64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
The following site contains more information on PS/2 keyboard interfaces:
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The PS/2 Keyboard Interface
Mouse
A mouse generates a clock and data signal when moved; otherwise, these signals remain
High indicating the Idle state. Each time the mouse is moved, the mouse sends three 11-bit
words to the host. Each of the 11-bit words contains a ‘0’ start bit, followed by 8 data bits
(LSB first), followed by an odd parity bit, and terminated with a ‘1’ stop bit. Each data
transmission contains 33 total bits, where bits 0, 11, and 22 are ‘0’ start bits, and bits 10, 21,
and 32 are ‘1’ stop bits. The three 8-bit data fields contain movement data as shown in
Mouse status byte
X direction byte
Y direction byte
1
0
L
R
0
1 XS YS XV YV P
1
0 X0 X1 X2 X3 X4 X5 X6 X7 P
1
0 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 P
1
Idle state
Start bit
Stop bit
Start bit
Stop bit
Start bit
Stop bit
Idle state
UG130_c6_04_042404
Figure 6-4: PS/2 Mouse Transaction
As shown in Figure 6-5 , a PS/2 mouse employs a relative coordinate system wherein
moving the mouse to the right generates a positive value in the X field, and moving to the
left generates a negative value. Likewise, moving the mouse up generates a positive value
in the Y field, and moving down represents a negative value. The XS and YS bits in the
status byte define the sign of each value, where a ‘1’ indicates a negative value.
+Y values (YS=0)
-X values
(XS=1)
-Y values (YS=1)
+X values
(XS=0)
UG130_c6_05_042404
Figure 6-5:
The Mouse Uses a Relative Coordinate System to Track Movement
The magnitude of the X and Y values represent the rate of mouse movement. The larger the
value, the faster the mouse is moving. The XV and YV bits in the status byte indicate when
the X or Y values exceed their maximum value, an overflow condition. A ‘1’ indicates when
30
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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