Advanced Chipset - TYAN TOMCAT I II Manual

5.3 Advanced Chipset

w w Global 430HX Enable
This option provides a method to enable or disable all of the additional
features provided by the 430HX chipset(enhancements to 430FX).
w w Shutdown to Port 92
When disabled, the 430HX forwards a Shutdown special cycle from
the host bus to the PCI bus. When enabled, the TXC will write a 1 to
I/O address 92 in response to a shutdown special cycle on the host bus.
The default is disabled.
w w Memory Hole
This option lets you create a memory hole for either the 512-640KB
region or the 15-16MB region. The default is disabled.
w w IRQ12/M Mouse Function
Enables or disables PS/2 mouse access to IRQ12.
The default is enabled.
w w 8 bit I/O Recovery Time
16 bit I/O Recovery Time
These options set the 8 bit and 16 bit I/O recovery time in the chipset.
I/O devices may not function correctly if two back to back I/O writes
occur too close together. These options increase the delay between
back to back I/O instructions.
The options for 8 bit are 1,2,3,4,5,6,7,8 Sysclk or Disabled.
The options for 16 bit are 1,2,3,4 Sysclk or Disabled.
The default for both options is 1 Sysclk.
w w DRAM Timing
This setup question allows the system to be set to either optimal
settings for 60ns or 70ns DRAM, or to be set to manual. In this mode
the next nine options are made available for customizing the memory
timing.
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