FDC37C672QFP SMSC Corporation, FDC37C672QFP Datasheet - Page 119

• Manufacturer Part Number: FDC37C672QFP
• Description: ENHANCED SUPER I/O CONTROLLER WITH FAST IR
• Manufacturer: SMSC Corporation

Enhanced Super I/O Controller with Fast IR
Datasheet
SMSC FDC37C672
When writing to the command and data port with hardware speedup, the IOW timing shown in the figure
titled “IOW Timing for Port 92” in the Timing Diagrams Section is used. This setup time is only required to
be met when using hardware speedup; the data must be valid a minimum of 0 nsec from the leading edge
of the write and held throughout the entire write cycle.
nIOW+n60=B
64=I/O Addr
60=I/O Addr
nAfterD1+B
nIOW+n64
nAfterD1
AfterD1
nCNTL
nIOW'
nAEN
nIOW
nDD1
GA20
AEN
DD1
CLK
D[1]
n64
n60
Figure 17.2 - Gate A20 Turn-On Sequence Timing
nA
0ns
DATASHEET
Page 119
250ns
500ns
Rev. 10-29-03