Cyrix Media GXM SDRAM config ?

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mya
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Joined: Fri Aug 16, 2002 9:52 am

Fri Aug 16, 2002 9:58 am

Hi,

I am using Cyrix 586 media gxm-AV 266 Mhz. The bios is by American Megatrends ,1997.

This is something which has puzzled me for a long time until I found this site and decided to post this query:-

There is " ENABLE GXM SDRAM OPTIONS " ----YES/NO
BY default it is disabled.

If enabled the following options become active

(VAlues which are valid)
CAS Latency -------------- 1 - 7
tRC Bits 24-27TIM1-------- 2 - 8
tRAS Bits 20-23TIM1------- 1 - 7
SDRAM Clock Ratio -------- 2 - 4
SDRAM Clock Shift--------- 0 - 3.5

I have tried enabling this option and putting various values but whenever I have done it my computer hangs before it even tries to load windows and I have to reset my original settings .

Is there some settings which is the optimal setting. I have 192 Mb SDRAM installed.

I did not try to flash for a later bios as the bios is surface mounted, hence to be on the safer side.

Also the VESA memory is limited to 2.5 Mb (Max, Shared) .
Is there any other way by which I can increase this Video Memory?

I would be very glad if someone could help me.
soupy
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Fri Aug 16, 2002 3:34 pm

http://www.avt.com.hk/mediagx/gxm-av.asp

Video memory most likely has a fixed max. A BIOS update probably won't increase it.

Enable GXM SDRAM Option
This field is control signals item of the Synchronous SDRAM system access cycle when SDRAM is installed.
Available Options: Disable, Enable
Default setting: Disable

CAS Latency
This field specifies the length of the delay inserted between RAS and CAS signals of the Synchronous DRAM system access cycle.
Available Options: 1, 2, 3, 4, 5, 6 and 7
Default setting: 3

tRC Bits 24-27 TIM1
This field specifies the SDRAM between refresh and ACT /PRE commands.
Available Options: 2, 3, 4, 5, 6, 7 and 8
Default setting: 3

tRAS Bits 20-23 TIM1
This field specifies the SDRAM between refresh and ACT commands.
Available Options: 1, 2, 3, 4, 5, 6 and 7
Default setting: 7

SDRAM Clock Ratio
This specifies the SDRAM clock ratio.
Available Options: 2.0, 2.5, 3.0, 3.5, and 4
Default setting: 3.0

SDRAM Clock Shift
This specifies the SDRAM clock meet SDRAM setup and hold time requirements.
Available Options: No Shift, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0 and 3.5
Default setting: 1.5
Flash your BIOS at your own risk.
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