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Siemens Simatic PG 740 Manual page 74

Programming device
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"Memory Cache"
The following submenu appears when you select the option "Memory cache"
Option
in the main menu:
Figure 5-4
A cache is a fast intermediate memory located between the CPU and the
main memory (DRAM). Repeated memory access operations are executed in
the fast cache, and not in the main memory, provided the feature is enabled.
It may be necessary to disable the cache with certain hardware and software
because intentional program runtimes or delay times are prevented by the fast
cache.
Programming Device PG 740
C79000-G7076-C742-01
PhoenixBIOS Setup-Copyright 1985-95 Phoenix Technologies Ltd.
Main
Advanced
Security
Memory Cache
Cache:
[Enabled]
Cache System BIOS area:
[Enabled]
Cache Video BIOS area:
[Enabled]
F1
Help
Select Item
+ / –
ESC
Exit
Select Menu
Enter Select
"Memory Cache" Submenu
Configuring the PG 740
Power
Exit
Item Specific Help
Cache Controls. If Diasabled is
selected, then both internal
and external Cache are
disabled. If set to Enabled,
then internal Cache and
optionaly external Cache are
enabled. System and Video
BIOS Cache settings have no
effect, if this item is set to
Disabled.
Change Values
F9
Setup Defaults
Sub-Menu
F10
Previous Values
5
5-9

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