*New* ABIT Fatal1ty AN8-SLI = 3.55V Vdimm

**tictac** · 06-18-2005, 05:37 AM

So far i able to build this source code as my A64 memory timing patcher through bios level...

Anybody have Dimm Dram Drive Strenght & Data Drive Stregth as DFI bios please let me know where it is located.. i'm not able to find it

. Please correct me if you find any bug on my source code

I hope abit can add in more memory timing in future bios of this board...

ISA ROM Patch Source Code

Code:

;---------------------------------------------------------------------
; tictac A64 Bios Tweaker Rev 001 Alpha
;---------------------------------------------------------------------
.486p

CSEG	SEGMENT PARA PUBLIC USE16 'CODE'
	ASSUME CS:CSEG
	ORG 0

;---------------------------------------------------------------------
; Expansion PCI ROM Header
;---------------------------------------------------------------------
	
	db  55h   			; Rom signature byte 1
    	db  0AAh  			; Rom signature byte 2
	db  01h   			; Rom Size (1bit = 512 bytes)

	jmp INIT  			;jump to initialization
    	
;---------------------------------------------------------------------
; Address & Data Port
;---------------------------------------------------------------------

	address		equ 0CF8h	; Access to configuration address
	data		equ 0CFCh	; Access to configuration data
	
	
;---------------------------------------------------------------------
; PCI Bus, Device, Function, Register
;---------------------------------------------------------------------
; _________________________________________________________________	
; |	28|	24|	20|	16|	12|	 8|	 4|	 0| Bits Number
; |1 0 0 0|0 0 0 0|0 0 0 0 0 0 0 0|0 0 0 0|0 0 0 0|0 0 0 0|0 0 0 0| Bits
; |1 - - -|- - - -|  Bus Number   | Device  |Func |Reg        |- -| Definition
; |1 0 0 0|0 0 0 0|0 0 0 0 0 0 0 0|1 1 0 0 0|0 1 0|0 0 0 0 0 0|0 0| Bits
; |   8   |   0   |   0       0   |   24    |  2  |           | 0 | Decimal
; |   8   |   0   |   0       0   |   C   |    2  |       |       | Hex
; |_______________________________________________________________|	

	dtl_add   	equ 08000C288h ; DRAM Timing Low
	dth_add		equ 08000C28Ch	; DRAM Timing High
	dcl_add		equ 08000C290h	; DRAM Configuration Low
	dch_add		equ 08000C294h	; DRAM Configuration High
	ddr_add		equ 08000C298h	; DRAM Delay Line Register
	
	
;---------------------------------------------------------------------
; DRAM Timing Low Address
;---------------------------------------------------------------------
; CAS Latency(dtl)
	tcl_data    	equ 0FFFFFFF8h	; CAS Latency (3bit)
	tcl_2		equ 000000001h	; CAS 2
	tcl_25		equ 000000005h	; CAS 2.5
	tcl_3		equ 000000002h	; CAS 3
	
; Row Cycle Time(dtl)
	trc_data	equ 0FFFFFF0Fh	; Row Cycle Time (4bit)
	trc_7		equ 000000000h	;
	trc_8		equ 000000010h	;
	trc_9		equ 000000020h	;
	trc_10		equ 000000030h	;
	trc_11		equ 000000040h	;
	trc_12		equ 000000050h	;
	trc_13		equ 000000060h	;
	trc_14		equ 000000070h	;
	trc_15		equ 000000080h	;
	trc_16		equ 000000090h	;
	trc_17		equ 0000000A0h	;
	trc_18		equ 0000000B0h	;
	trc_19		equ 0000000C0h	;
	trc_20		equ 0000000D0h	;
	trc_21		equ 0000000E0h	;
	trc_22		equ 0000000F0h	;
	
; Row Refresh Cycle Time(dtl)
	trfc_data	equ 0FFFFF0FFh	; Row Refresh Cycle Time (4bit)
	trfc_9		equ 000000000h	;
	trfc_10		equ 000000100h	;
	trfc_11		equ 000000200h	;
	trfc_12		equ 000000300h	;
	trfc_13		equ 000000400h	;
	trfc_14		equ 000000500h	;
	trfc_15		equ 000000600h	;
	trfc_16		equ 000000700h	;
	trfc_17		equ 000000800h	;
	trfc_18		equ 000000900h	;
	trfc_19		equ 000000A00h	;
	trfc_20		equ 000000B00h	;
	trfc_21		equ 000000C00h	;
	trfc_22		equ 000000D00h	;
	trfc_23		equ 000000E00h	;
	trfc_24		equ 000000F00h	;
	
; RAS to CAS Delay(dtl)
	trcd_data	equ 0FFFF8FFFh	; RAS to CAS Delay (3bit)
	trcd_2		equ 000002000h	; 2 clock
	trcd_3		equ 000003000h	; 3 clock
	trcd_4		equ 000004000h	; 4 clock
	trcd_5		equ 000005000h	; 5 clock
	trcd_6		equ 000006000h	; 6 clock

; RAS to RAS Delay(dtl)
	trrd_data	equ 0FFF8FFFFh	; RAS to RAS Delay (3bit)
	trrd_2		equ 000020000h	; 2 clock
	trrd_3		equ 000030000h	; 3 clock
	trrd_4		equ 000040000h	; 4 clock
	
; Min. RAS active time(dtl)
	tras_data	equ 0FF0FFFFFh	; Min. RAS active time (4bit)
	tras_5		equ 000500000h	; 5 clock
	tras_6		equ 000600000h	; 6 clock
	tras_7		equ 000700000h	; 7 clock
	tras_8		equ 000800000h	; 8 clock
	tras_9		equ 000900000h	; 9 clock
	tras_10		equ 000A00000h	; 10clock
	tras_11		equ 000B00000h	; 11clock
	tras_12		equ 000C00000h	; 12clock
	tras_13		equ 000D00000h	; 13clock
	tras_14		equ 000E00000h	; 14clock
	tras_15		equ 000F00000h	; 15clock
	
; Row Precharge Time(dtl)
	trp_data	equ 0F8FFFFFFh	; Row Precharge Time (3bit)
	trp_2		equ 002000000h	; 2 clock
	trp_3		equ 003000000h	; 3 clock
	trp_4		equ 004000000h	; 4 clock
	trp_5		equ 005000000h	; 5 clock
	trp_6		equ 006000000h	; 6 clock
	
; Write Recovery Time(dtl)
	twr_data	equ 0EFFFFFFFh	; Write Recovery Time (1bit)
	twr_2		equ 000000000h	; 2 clock
	twr_3		equ 010000000h	; 3 clock
	
	
;---------------------------------------------------------------------
; DRAM Timing High Address
;---------------------------------------------------------------------
; Write to read delay(dth)
	twtr_data    	equ 0FFFFFFFEh	; Write to read delay (1bit)
	twtr_1    	equ 000000001h	; 1 clock
	twtr_2    	equ 000000002h	; 2 clock
	
; Read to write delay(dth)
	trwt_data	equ 0FFFFFF8Fh	; Read to write delay (3bit)
	trwt_1		equ 000000000h	; 1 clock
	trwt_2		equ 000000010h	; 2 clock
	trwt_3		equ 000000020h	; 3 clock
	trwt_4		equ 000000030h	; 4 clock
	trwt_5		equ 000000040h	; 5 clock
	trwt_6		equ 000000050h	; 6 clock
	
; Refresh Rate(dth)
	tref_data	equ 0FFFFE0FFh	; Refresh Rate (5bit)
	tref_100_156	equ 000000000h	; 100MHz 15.6us
	tref_133_156	equ 000000100h	; 133MHz 15.6us
	tref_166_156	equ 000000200h	; 166MHz 15.6us
	tref_200_156	equ 000000300h	; 200MHz 15.6us
	tref_100_78	equ 000000800h	; 100MHz 7.8us
	tref_133_78	equ 000000900h	; 133MHz 7.8us
	tref_166_78	equ 000000A00h	; 166MHz 7.8us
	tref_200_78	equ 000000B00h	; 200MHz 7.8us
	tref_100_39	equ 000001000h	; 100MHz 3.9us
	tref_133_39	equ 000001100h	; 133MHz 3.9us
	tref_166_39	equ 000001200h	; 166MHz 3.9us
	tref_200_39	equ 000001300h	; 200MHz 3.9us
	
; Write CAS latency(dth)
	twcl_data	equ 0FF8FFFFFh	; Write CAS latency (3bit)
	twcl_1		equ 000000000h	; 1 clock
	twcl_2		equ 000100000h	; 2 clock


;---------------------------------------------------------------------
; DRAM Configuration Low Address
;---------------------------------------------------------------------
; DLL Disabled(dcl)
	dll_data	equ 0FFFFFFFEh	; DLL disabled (1bit)
	dll_enable	equ 000000000h	; Enabled(default)
	dll_disable	equ 000000001h	; Disabled
	
; Dimm Drive Strength(dcl)
	dds_data	equ 0FFFFFFFDh	; Dimm Drive Strength (1bit)
	dds_normal	equ 000000000h	; (Default)
	dds_weak	equ 000000002h	; (Beware)
	
; Read/Write Qued Bypass(dcl)
	rwqbp_data	equ 0FFFF3FFFh	; Read/Write Qued Bypass (2bit)
	rwqbp_2x	equ 000000000h	; 2x
	rwqbp_4x	equ 000004000h	; 4x
	rwqbp_8x	equ 000008000h	; 8x
	rwqbp_16x	equ 00000C000h	; 16x

; Bypass Max(dcl)
	bpm_data	equ 0F1FFFFFFh	; Bypass Max (3bit)
	bpm_0x		equ 000000000h	; 0x (Disabled)
	bpm_1x		equ 002000000h	; 1x
	bpm_2x		equ 004000000h	; 2x
	bpm_3x		equ 006000000h	; 3x
	bpm_4x		equ 008000000h	; 4x
	bpm_5x		equ 00A000000h	; 5x
	bpm_6x		equ 00C000000h	; 6x
	bpm_7x		equ 00E000000h	; 7x

; Command Rate(dcl)
	cr_data		equ 0EFFFFFFFh	; Command Rate (1bit)
	cr_1t		equ 000000000h	; 1T
	cr_2t		equ 010000000h	; 2T


;---------------------------------------------------------------------
; DRAM Configuration High Address
;---------------------------------------------------------------------
; Maximum Async Latency(dch)
	async_data    	equ 0FFFFFFF0h	; Maximum Async Latency (4bit)
	async_0    	equ 000000000h	; 0 ns
	async_1    	equ 000000001h	; 1 ns
	async_2    	equ 000000002h	; 2 ns
	async_3    	equ 000000003h	; 3 ns
	async_4    	equ 000000004h	; 4 ns
	async_5    	equ 000000005h	; 5 ns
	async_6    	equ 000000006h	; 6 ns
	async_7    	equ 000000007h	; 7 ns
	async_8    	equ 000000008h	; 8 ns
	async_9    	equ 000000009h	; 9 ns
	async_10    	equ 00000000Ah	; 10ns
	async_11    	equ 00000000Bh	; 11ns
	async_12    	equ 00000000Ch	; 12ns
	async_13    	equ 00000000Dh	; 13ns
	async_14    	equ 00000000Eh	; 14ns
	async_15    	equ 00000000Fh	; 15ns
	
; Read Preamble(dch)
	rp_data    	equ 0FFFFF0FFh	; Read Preamble (4bit)
	rp_20    	equ 000000000h	; 2.0ns
	rp_25    	equ 000000100h	; 2.5ns
	rp_30    	equ 000000200h	; 3.0ns
	rp_35    	equ 000000300h	; 3.5ns
	rp_40    	equ 000000400h	; 4.0ns
	rp_45    	equ 000000500h	; 4.5ns
	rp_50    	equ 000000600h	; 5.0ns
	rp_55    	equ 000000700h	; 5.5ns
	rp_60    	equ 000000800h	; 6.0ns
	rp_65    	equ 000000900h	; 6.5ns
	rp_70    	equ 000000A00h	; 7.0ns
	rp_75    	equ 000000B00h	; 7.5ns
	rp_80    	equ 000000C00h	; 8.0ns
	rp_85    	equ 000000D00h	; 8.5ns
	rp_90    	equ 000000E00h	; 9.0ns
	rp_95    	equ 000000F00h	; 9.5ns
	
; Idle Cycle Limit(dch)
	icl_data	equ 0FFF8FFFFh	; Idle Cycle Limit (3bit)
	icl_0		equ 000000000h	; 0 clock
	icl_4		equ 000010000h	; 4 clock
	icl_8		equ 000020000h	; 8 clock
	icl_16		equ 000030000h	; 16clock
	icl_32		equ 000040000h	; 32clock
	icl_64		equ 000050000h	; 64clock
	icl_128		equ 000060000h	; 128clock
	icl_256		equ 000070000h	; 256clock

; Dynamic idle cycle counter enable(dch)
	dicc_data	equ 0FFF7FFFFh	; Dynamic idle cycle limit (1bit)
	dicc_disable	equ 000000000h	; disabled
	dicc_enable	equ 000080000h	; enabled
	
; Memory Clock Frequency(dch)
	mcf_data	equ 0FF8FFFFFh	; Memory Clock Frequency (3bit)
	mcf_100		equ 000000000h	; 100MHz 
	mcf_133		equ 000200000h	; 133MHz
	mcf_166		equ 000500000h	; 166MHz
	mcf_200		equ 000700000h	; 200MHz (1:1)


;---------------------------------------------------------------------
; DRAM DQS Delay Line Register
;---------------------------------------------------------------------
; DQS Slew Value(ddr)
	dqs_data	equ 0FF00FFFFh	; Delay Line Adjust (8bit)
	dqs_1		equ 000010000h	; 1
	dqs_2		equ 000020000h	; 2
	dqs_3		equ 000030000h	; 3
	dqs_4		equ 000040000h	; 4
	dqs_5		equ 000050000h	; 5
	dqs_6		equ 000060000h	; 6
	dqs_7		equ 000070000h	; 7
	dqs_8		equ 000080000h	; 8
	dqs_9		equ 000090000h	; 9
	dqs_10		equ 0000A0000h	; 10
	dqs_255		equ 000FF0000h	; 255

; DQS Slew Control(ddr)
	dqsc_data	equ 0FCFFFFFFh	; Adjust DQS (1bit) & (1bit)
	dqsc_slow	equ 001000000h	; Slower DQS
	dqsc_fast	equ 002000000h	; Faster DQS
	

;---------------------------------------------------------------------
; Sub Routine
;---------------------------------------------------------------------			
	ORG 100h

SAVE1	PROC	 NEAR			; Save all register that will be affected by our code
	push eax
	push ebx
	push edx
	pushfd
	ret
SAVE1	ENDP

SENDER	PROC	 NEAR			; Active communication with address
	mov dx,address
	out dx,eax
	ret
SENDER	ENDP

RECEIVER	PROC	NEAR		; Comunicate with the address & receive the data
	mov dx,address
	out dx,eax
	mov dx,data
	in eax,dx
	ret
RECEIVER	ENDP

TUNER1	PROC	NEAR			; Sending new data from ebx stack
	xchg eax,ebx
	out dx,eax
	xchg eax,ebx
	ret
TUNER1		ENDP

TUNER2	PROC	NEAR			; Increase data (OR)
	or eax,ebx
	out dx,eax
	ret
TUNER2		ENDP

TUNER3	PROC	NEAR			; Decrease data (AND)
	and eax,ebx
	out dx,eax
	ret
TUNER3		ENDP

RETURN1	PROC	NEAR			; Restore register contents and return far to system
	popfd
	pop edx
	pop ebx
	pop eax
	retf
RETURN1		ENDP

RETURN2	PROC	NEAR			; Restore register contents and return to SATA bios
	popfd
	pop edx
	pop ebx
	pop eax
	retf
RETURN2		ENDP

;---------------------------------------------------------------------
; Main Routine
;---------------------------------------------------------------------

INIT	PROC	NEAR

; save all register that will be affected by our code
	call SAVE1

; trc = 13
	mov eax,dtl_add
	mov ebx,trc_13
	call RECEIVER
	and eax,trc_data
	call TUNER2

; trfc = 15
	mov eax,dtl_add
	mov ebx,trfc_15
	call RECEIVER
	and eax,trfc_data
	call TUNER2

; END Patch back to system bios or SATA jump (RETURN1 = System ; RETURN2 = SATA jump)
	call RETURN2

INIT	ENDP

	ORG 200h

CSEG	ENDS	
		END		

;---------------------------------------------------------------------
; tictac A64 Bios Tweaker Rev 001 Alpha
;---------------------------------------------------------------------

**blueangelman** · 06-18-2005, 08:30 AM

AN8 Ultra : nForce4 Ultra + Silent OTES Heatpipe + 7.1 Audio (Max Vdimm 3.55V

is that a good solution? it s stable enough that motherboard?

chew* · 06-18-2005, 09:13 AM

Originally Posted by blueangelman

AN8 Ultra : nForce4 Ultra + Silent OTES Heatpipe + 7.1 Audio (Max Vdimm 3.55V

is that a good solution? it s stable enough that motherboard?

that was the board i was going to get however it was unavailable so i got the sli board and currently hold all 3 records for an abit overclock on them . stable enough for you?

chew* · 06-18-2005, 09:22 AM

figured id make a note of this for everyone.

ddrv undervolt by .05 so in order to run tccd at 3.0 volts set vddr to 3.05 and vtt to 1.5v

**situman** · 06-18-2005, 11:08 AM

Originally Posted by chew*

figured id make a note of this for everyone.

ddrv undervolt by .05 so in order to run tccd at 3.0 volts set vddr to 3.05 and vtt to 1.5v

is this kind of undervolting considered severe or acceptable or normal?

chew* · 06-18-2005, 11:30 AM

Originally Posted by situman

is this kind of undervolting considered severe or acceptable or normal?

kinda normal considering if you do a 3.3v rail mod you need 3.4-3.5v for the memory to see 3.3v

chew* · 06-18-2005, 12:32 PM

tccd performance versus bh-5 on an8

tccd @ 300mhz timings 2.5-9-14-4-2-6-3-2-2-3-1t

bh-5 @ 240mhz timings 2-8-12-2-2-5-2-2-1-1-1t

clock speed of cpu is 2400mhz in both tests. I used this as an average overclock of what most people will see as a 100% stable overclock.

tccd

bh-5

as you can see the tccd manages to barely edge out the bh-5 in all tests but the performance difference is minimal. the choice is obvious for those with a weak memory controller and those already having bh-5 i wouldnt suggest going out and buying tccd.

**astaris** · 06-18-2005, 09:35 AM

Originally Posted by tictac

So far i able to build this source code as my A64 memory timing patcher through bios level...

Anybody have Dimm Dram Drive Strenght & Data Drive Stregth as DFI bios please let me know where it is located.. i'm not able to find it

. Please correct me if you find any bug on my source code

I hope abit can add in more memory timing in future bios of this board...

code]

TicTac i think that Data Drive Stregth in DFI bios set the Memory DQ Drive Strength field in DRAM Configuration High Address (bits 13-14).

I suggest you to take into account all possible combinations of the refresh cycle in your tweaker. About Tref i think the bits in the Refresh Rate field of the DRAM Timing High Register are encoded in this way:
Bits 12-11 are the refresh cycle in us:
00 -> 15.6 us
01 -> 7.8 us
10 - > 3.9 us
11 -> 1.95 us
Bits 10-8 are the MemFreq where the refresh cycle selected in Bits 12-11 is given. These Bits are encoded like the DRAM MEMCLK Frequency field in the DRAM Configuration High Register:
000b = 100 MHz
001b = 120 Mhz
010b = 133 MHz
011b = 140 Mhz
100b = 150 Mhz
101b = 166 MHz
110b = 180 Mhz
111b = 200 MHz
However on the Abit Board you can select 216, 233 and 250 Ram Freq (through the bit 30 of the DRAM Configuration High Register i think), so we have:
000b = 100 MHz
001b = 216 Mhz
010b = 133 MHz
011b = 233 Mhz
100b = 250 Mhz
101b = 166 MHz
110b = 180 Mhz
111b = 200 MHz

chew* · 06-18-2005, 09:39 AM

anyone live near rhode island that wants to temporarily donate a venice for me to test to confirm that its a cpu microcode issue as to why 1 t isnt working for them? should have mushkin utt redline results soon waiting to borrow it off a friend.

**Psyche911** · 06-18-2005, 10:29 AM

Originally Posted by chew*

anyone live near rhode island that wants to temporarily donate a venice for me to test to confirm that its a cpu microcode issue as to why 1 t isnt working for them?

What would that mean? That the board will always have issues with 1T & Venice or would an update to the CPUs or BIOS be needed? I really wanted that combo.

**ukveld** · 06-18-2005, 10:33 AM

Some ppl do have issues with 1T & Venice (like me...

) and the latest bios (1.5) doesn´t help at all...

chew* · 06-18-2005, 10:33 AM

Originally Posted by Psyche911

What would that mean? That the board will always have issues with 1T & Venice or would an update to the CPUs or BIOS be needed? I really wanted that combo.

well it appears i am one of the few people that has high fsb/ w 1t command rate without issues. It would also appear that i am one of the few that is using a clawhammer. That would mean that A. everyone has a cruddy venice or sandy which i doubt B. everyone has a bad board and mine is just cherry which i also doubt or C. the cpu microcode in the bios isn't optimized for those cpu's yet.

**ukveld** · 06-18-2005, 10:51 AM

Don´t get me wrong... i love this motherboard, and i know Abit will do it´s jog right, it´s just a matter of time. Chew* what are your temps?

chew* · 06-18-2005, 11:29 AM

Originally Posted by ukveld

Don´t get me wrong... i love this motherboard, and i know Abit will do it´s jog right, it´s just a matter of time. Chew* what are your temps?

inaccurate at best abit eq says 117f on average. Mind you i have a asetek waterchill pro and i run this cpu at 2.4 gig at default volts for 24/7 use. there is no way a asetek 3x120 radiator setup with fans on high is running at those temps.

**dinos22** · 06-18-2005, 02:21 PM

gracie astaris

WE NEED 150 DIVIDER....Tictac pls keep that in mind if you are going to do a modded bios

Originally Posted by astaris

TicTac i think that Data Drive Stregth in DFI bios set the Memory DQ Drive Strength field in DRAM Configuration High Address (bits 13-14).

I suggest you to take into account all possible combinations of the refresh cycle in your tweaker. About Tref i think the bits in the Refresh Rate field of the DRAM Timing High Register are encoded in this way:
Bits 12-11 are the refresh cycle in us:
00 -> 15.6 us
01 -> 7.8 us
10 - > 3.9 us
11 -> 1.95 us
Bits 10-8 are the MemFreq where the refresh cycle selected in Bits 12-11 is given. These Bits are encoded like the DRAM MEMCLK Frequency field in the DRAM Configuration High Register:
000b = 100 MHz
001b = 120 Mhz
010b = 133 MHz
011b = 140 Mhz
100b = 150 Mhz
101b = 166 MHz
110b = 180 Mhz
111b = 200 MHz
However on the Abit Board you can select 216, 233 and 250 Ram Freq (through the bit 30 of the DRAM Configuration High Register i think), so we have:
000b = 100 MHz
001b = 216 Mhz
010b = 133 MHz
011b = 233 Mhz
100b = 250 Mhz
101b = 166 MHz
110b = 180 Mhz
111b = 200 MHz

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