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型号： HW-SPAR3AN-SK-UNI-G
厂商： Xilinx Inc
文件页数： 67/140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
R
Keyboard
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 might send more than one scan code. When an extended key is released, an “E0 F0”
key-up code is sent, followed by the scan code.
ESC
F1
F2
F3
F4
F5
F6
F7
F8
F9
F10
F11
F12
76
05
06
04
0C
03
0B
83
0A
01
09
78
07
E0 75
`~
1!
2@
3#
4$
5%
6^
7&
8*
9(
0)
-_
=+
Back Space
0E
TA B
16
Q
1E
W
26
E
25
R
2E
T
36
Y
3D
U
3E
I
46
O
45
P
4E
[{
55
]}
66
\|
E0 74
0D
Caps Lock
15
A
1D
S
24
D
2D
F
2C
G
35
H
3C
J
43
K
44
L
4D
;:
54
'"
5B
5D
Enter
E0 6B
58
Shift
12
1C
Z
1Z
1B
X
22
23
C
21
2B
V
2A
34
B
32
33
N
31
3B
M
3A
42
,<
41
4B
>.
49
4C
/?
4A
52
5A
Shift
59
E0 72
Ctrl
14
Alt
11
Space
29
Alt
E0 11
Ctrl
E0 14
UG230_c8_03_021806
Figure 8-3:
PS/2 Keyboard Scan Codes
The host can also send commands and data to the keyboard. Table 8-3 provides a short list
of some often-used commands.
Table 8-3:
Common PS/2 Keyboard Commands
Command
ED
Description
Turn on/off Num Lock, Caps Lock, and Scroll Lock LEDs. The keyboard acknowledges receipt of an
“ED” command by replying with an “FA”, after which the host sends another byte to set LED status. The
bit positions for the keyboard LEDs are shown below. Write a ‘1’ to the specific bit to illuminate the
associated keyboard LED.
7
6
5
4
3
2
1
0
Ignored
Caps Lock
Num Lock
Scroll Lock
EE
F3
FE
FF
Echo. Upon receiving an echo command, the keyboard replies with the same scan code “EE”.
Set scan code repeat rate. The keyboard acknowledges receipt of an “F3” by returning an “FA”, after
which the host sends a second byte to set the repeat rate.
Resend. Upon receiving a resend command, the keyboard resends the last scan code.
Reset. Resets the keyboard.
The keyboard sends commands or data to the host only when both the data and clock lines
are High, the Idle state.
Because the host is the bus master , the keyboard checks whether the host is sending data
before driving the bus. The clock line can be used as a clear to send signal. If the host pulls
the clock line Low, the keyboard must not send any data until the clock is released.
Spartan-3A/3AN FPGA Starter Kit Board User Guide www.xilinx.com
UG334 (v1.1) June 19, 2008
67
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