w83977atg Winbond Electronics Corp America, w83977atg Datasheet - Page 110
w83977atg
Manufacturer Part Number
w83977atg
Description
W83877tf Plus Kbc, Gp I/o, Wake-up, Fir, Cir, Pb-free
Manufacturer
Winbond Electronics Corp America
Datasheet
1.W83977ATG.pdf
(198 pages)
Available stocks
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Quantity
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Part Number:
w83977atg-AW
Manufacturer:
Nuvoton Technology Corporation of America
Quantity:
10 000
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W83977ATF/W83977ATG
GATEA20 and KBRESET are controlled by either the software control or the hardware control logic
and they are mutually exclusive. Then, GATEA20 and KBRESET are merged along with Port92 when
P92EN bit is set.
9.5.2
Port 92 Control Register (Default Value = 0x24)
BIT
7
6
5
4
3
2
1
0
NAME
Res. (0)
Res. (0)
Res. (1)
Res. (0)
Res. (0)
Res. (1)
SGA20
PLKBRST
SGA20 (Special GATE A20 Control)
A "1" on this bit drives GATE A20 signal to high.
A "0" on this bit drives GATE A20 signal to low.
PLKBRST (Pull-Low KBRESET)
A "1" on this bit causes KBRESET to drive low for 6 μ S (Min.) with 14 μ S (Min.) delay. Before issuing
another keyboard reset command, the bit must be cleared.
- 102 -
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