FDC37B787-NS SMSC, FDC37B787-NS Datasheet - Page 132
![IC CTRLR SUPER I/O ENH 128-QFP](/photos/6/82/68213/fdc37b787-ns_sml.jpg)
FDC37B787-NS
Manufacturer Part Number
FDC37B787-NS
Description
IC CTRLR SUPER I/O ENH 128-QFP
Manufacturer
SMSC
Datasheet
1.FDC37B787-NS.pdf
(249 pages)
Specifications of FDC37B787-NS
Controller Type
I/O Controller
Interface
ISA Host
Voltage - Supply
4.5 V ~ 5.5 V
Current - Supply
70mA
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
128-QFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
638-1006
Available stocks
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Manufacturer
Quantity
Price
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Standard
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Microsemi
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20 000
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GATEA20 AND KEYBOARD RESET
The
GateA20 and Keyboard Reset: 8042 Software
Generated GateA20 and KRESET and Port 92
Fast GateA20 and KRESET.
FDC37B78x
Bit
7:6
5
4
3
2
1
0
Function
Reserved. Returns 00 when read
Reserved. Returns a 1 when read
Reserved. Returns a 0 when read
Reserved. Returns a 0 when read
Reserved. Returns a 1 when read
ALT_A20 Signal control. Writing a 0 to this bit causes the ALT_A20 signal to be
driven low. Writing a 1 to this bit causes the ALT_A20 signal to be driven high.
Alternate System Reset. This read/write bit provides an alternate system reset
function. This function provides an alternate means to reset the system CPU to
effect a mode switch from Protected Virtual Address Mode to the Real Address
Mode. This provides a faster means of reset than is provided by the Keyboard
controller. This bit is set to a 0 by a system reset. Writing a 1 to this bit will cause
the nALT_RST signal to pulse active (low) for a minimum of 1 µs after a delay of
500 ns. Before another nALT_RST pulse can be generated, this bit must be written
back to a 0.
provides
two
Name
Location
Default Value
Attribute
Size
options
Port 92 Register
for
134
PORT 92 FAST GATEA20 AND KEYBOARD
RESET
Port 92 Register
This port can only be read or written if Port 92
has been enabled via bit 2 of the KRST_GA20
Register (Logical Device 7, 0xF0) set to 1.
This register is used to support the alternate
reset (nALT_RST) and alternate A20 (ALT_A20)
functions.
Port 92
92h
24h
Read/Write
8 bits
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