Siemens SIMATIC PG 760 PII Manual page 63

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Option "Memory
The following pop-up menu appears when you select the option "Memory
Cache"
cache" in the main menu:
Figure 5-4
A cache is a fast intermediate memory located between the CPU and the
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.
[Disabled]
[Write Through]
[Write Back]
PG 760 PII Programming Device
C79000-G7076-C766-01
PhoenixBIOS Setup Utility
Main
Advanced
Security
[ 15:35:32 ]
System Time:
[ 01/23/1998 ]
System Date:
[ 1.44 MB, 31/2" ]
Diskette A:
[ Disabled]
Diskette B:
[3249MB]
Primary Master
[None]
Primary Slave
[CD-ROM]
Secondary Master
[None]
Secondary Slave
Disabled
[Write
Write Through
Memory Cache:
Write Back
Boot Options
Keyboard Features
Hardware Options
System Memory:
640 KB
Extended Memory:
64512 KB
F1
Help
Select Item
+ / –
ESC
Exit
Select Menu
Enter Select
"Memory Cache" Submenu
Cache is disabled.
Write access is only concluded when an entry is made in the
main memory.
Write access is concluded immediately, the entry in the RAM
takes place in the background.
Configuring the PG 760 PII
Power
Exit
Item Specific Help
Controls caching of system
conventional memory and
memory above one megabyte
Change Values
F9
Setup Defaults
Sub-Menu
F10
Save and Exit
5-9

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