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型号： HW-SPAR3AN-SK-UNI-G
厂商： Xilinx Inc
文件页数： 66/140页
文件大小： 0K
描述： KIT STARTER SPARTAN-3 AN
产品变化通告： Adapter Replacement 23/May/2008
标准包装： 1
系列： Spartan®-3AN
类型： FPGA
适用于相关产品： Spartan-3AN XC3S700AN-FG484，XCF04S-VOG20C
所含物品： 面板、缆线、软件、数据表和用户手册
相关产品： XC3S700AN-5FGG484C-ND - IC FPGA SPARTAN-3A 700K 484-FBGA
122-1598-ND - IC FPGA SPARTAN -3AN700K 484FBGA
122-1556-ND - IC SPARTAN-3AN FPGA 700K 484FBGA
其它名称： 122-1528
HW-SPAR3AN-SK-UNI-G-PROMO
HW-SPAR3AN-SK-UNI-G-PROMO-ND
Chapter 8: PS/2 Mouse/Keyboard Port
R
The PS/2 port I/Os should always be set to LVCMOS33 with the PULLUP attribute set
true when used. If this attribute is not set, the voltage on the PS/2 I/Os will be greater than
the maximum specified permissible amount in the data sheet. These I/Os can be damaged
if the bitstream option for unused I/Os is set to float and the FPGA design is not using the
PS/2 port pins.
Both a PC mouse and keyboard use the two-wire PS/2 serial bus to communicate with a
host device, the FPGA in this case. The PS/2 bus includes both clock and data. Both a
mouse and keyboard drive the bus with identical signal timings, and both use 11-bit words
that include a start, a stop, and an odd parity bit. However, the data packets are organized
differently for a mouse and keyboard. Both the keyboard and mouse interfaces allows
bidirectional data transfers. For example, the FPGA host design can illuminate the state
LEDs on the keyboard or change the communicate rate with the mouse.
The PS/2 bus timing appears in Table 8-2 and Figure 8-2 . The clock and data signals are
only driven when data transfers occur; otherwise they are held in the idle state at a logic
High. The timing defines signal requirements for mouse-to-host communications and
bidirectional keyboard communications. As shown in Figure 8-2 , 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 8-2:
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
UG230_c8_02_021806
Figure 8-2: PS/2 Bus Timing Waveforms
Keyboard
The keyboard uses open-collector drivers so that either the device or the host can drive the
two-wire bus. If the host never sends data, then the host can use simple input pins.
A PS/2-style keyboard uses scan codes to communicate key-press data. 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 Figure 8-3 .
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 an “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
66
www.xilinx.com Spartan-3A/3AN FPGA Starter Kit Board User Guide
UG334 (v1.1) June 19, 2008
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