Rev. 3.0, 03/01, page 254 of 390
17.4
Block Diagram
Figure 17-1 shows a block diagram of the PS/2 keyboard or mouse interface. When one byte of
data is received from the external keyboard or mouse, the interface generates an interrupt to the
CPU.
Start
Parity
2.2k
Stop
Receive
control
KBCIE
(MSCIE)
KBCOE
(MSCOE)
KBDOE
(MSDOE)
KBCD
(MSCD)
KBDD
(MSDD)
KBCS
(MSCS)
KBDS
(MSDS)
KBRDF
(MSDRDF)
KBCSR
(MSCSR)
0
1
2
3
4
5
6
7
8
Key buffer (reciver data shift register)
Internal data bus
0
interrupt
KBISR
(MSISR)
KBCSR
(MSCSR)
15
14
13
12
11
10
9
D0
D1
D2
D3
D4
D5
D6
D7
KBDATA
(MSDATA)
KBCK
(MSCK)
Figure 17.1 PS/2 Keyboard/Mouse Interface Block Diagram
Summary of Contents for HD64465
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