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- ;************** OPTi 486SXWB: 82C495(SLC) , 82C392 *******************
- ; entspricht weitgehend OPTI 493
- ;******************** Datei OPTI495.CFG ***************************
- INDEXPORT=22H ;OPTI-Adressen
- DATENPORT=24H
- ;******************************************************************
-
- INDEX=20H ;Controll-Register 1
- ;******************************************************************
-
- BIT=76 ;Revision of 82C495
-
- BIT=5 ;Burst Waitstate-Control
- 0=\L2 read hit = 3-1-1-1 or 2-1-1-1
- 1=\L2 read hit = 3-2-2-2 or 2-2-2-2
-
- BIT=4 ;0/1 (495SLC) Turbo Mode Enable
-
- ; (495SX) ATCLK Source (refer to index 25h Bits1,0
- 0= CLK (/3,4,5,6)
- 1= CLK2(/3,4,5,6)
-
- ; (493) Cache memory data buffer output
- 0=disable: muß sein für <= 33 MHz
- 1=enable : muß sein für = 33 MHz
-
- BIT=3 ;0/1 Single ALE
-
- BIT=2 ;0/1 493,495SX Extra AT Cycle Waitstate
- ; 495SLC Reserved
-
- Bit=1 ;0/1 Emulation Keyboard Reset Control
-
- Bit=0 ;0/1 (493,495SX) Fast Reset
- ;0/1 (495SLC) Cyrix Mode
-
- Index=21H ;Control Register 2
- ;******************************************************************
-
- BIT=7 ;0/1 (493,495SX) Master Mode Byte Swap Enable
- ; (495) Reserved
-
- Bit=6 ; (493) Emulation Keyboard Reset Delay Control
- 0=Generate Reset Puls 2µs later
- 1=Generate reset pulse immediately
-
- ; (495SX, 495SLC) Cache Write 2 Wait States Control
- 1= 2 wait states bit 1 of index Register 21h will be ignored
- 0= either 0 or 1 wait state, refer to Bit 1 of index 21h
-
- Bit=5 ;1/0 Parity Check
-
- Bit=4 ;Cache Enable
- 0=Cache is disabled + DRAM-Burst enabled
- 1=Cache is enabled + DRAM Burst disabled
-
- Bit=32 ;Cachesize
- 00= 64KB
- 01= 128KB
- 10= 256KB
- 11= 512KB
-
- Bit=1 ;(493) Secondary Cache Read Burst Cycles Control
- 0=\3-1-1-1 Cycle
- 1=\2-1-1-1 Cycle
- ;(495SX,495SLC) Cache Write 0/1 Wait State Control
- ; with bit 6 of index 21h = 0
- 0=1 wait state
- 1=0 wait states
-
- Bit=0 ;(493)Cache Write State Control
- 0= 1 Waitstate
- 1= 0 Waitstate
-
- ;(495SX,495SLC)Cache Read Wait State Control
- 0=3-1-1-1
- 1=2-1-1-1
-
- Index=22H ;Shadow RAM Control Register 1
- ;******************************************************************
-
- Bit=7 ;ROM-Enable
- 1= Read from ROM, Write to DRAM
- 0= R/W on DRAM, DRAM is write protected
-
- Bit=6 ;Shadow RAM at D000h-DFFFh
- 0=Disable RAM
- 1=Enable RAM
-
- Bit=5 ;Shadow RAM at E000h-EFFFh
- 0=Disable RAM, enable ROMCS on XD-Bus
- 1=Enable RAM
-
- Bit=4 ;0/1 Shadow RAM at D000h-DFFFh Write Protection
-
- Bit=3 ;0/1 Shadow RAM at E000h-EFFFh
-
- Bit=2 ;Hidden Refresh
- 1=Disable (muß bei 493 bei 4x1M or 1Mx4 Bit DRAMs)
- 0=Enable
-
- Bit=1 ;unused
-
- Bit=0 ;0/1 (493,495SX) Slow Refresh Enable (1/4 Refresh Takt)
- ; (495SLC) reserverd
-
- Index=23H ;Shadow RAM Control Register II
- ;******************************************************************
-
- Bit=7 ;0/1 Shadow RAM at EC00h-EFFFh
-
- Bit=6 ;0/1 Shadow RAM at E800h-EBFFh
-
- Bit=5 ;0/1 Shadow RAM at E400h-E7FFh
-
- Bit=4 ;0/1 Shadow RAM at E000h-E3FFh
-
- Bit=3 ;0/1 Shadow RAM at DC00h-DFFFh
-
- Bit=2 ;0/1 Shadow RAM at D800h-DBFFh
-
- Bit=1 ;0/1 Shadow RAM at D400h-D7FFh
-
- Bit=0 ;0/1 Shadow RAM at D000h-D3FFh
-
- INDEX=24H ;Index Control Register 1
- ;******************************************************************
-
- Bit=7654 ;DRAM Typ Bank 0/1
- 0000=B0:256K B1:-
- 0001=B0:256K B1:256K
- 0010=B0:256K B1:1M
- 0011=B0: - B1: -
- 01xx=B0: - B1: -
- 1000=B0:1M B1: -
- 1001=B0:1M B1:1M
- 1010=B0:1M B1:4M
- 1011=B0:4M B1:1M
- 1100=B0:4M B1: -
- 1101=B0:4M B1:4M
- 111x=B0: - B1: -
-
- Bit=3 ;unused
- Bit=210 ;DRAM Typ Bank 2/3
- 000=B2:1M B3:-
- 001=B2:1M B3:1M
- 010=B2: - B3: -
- 011=B2:4M B3:1M
- 100=B2:4M B3: -
- 101=B2:4M B3:4M
- 11X=B2: - B3: -
-
-
-
- Index=25H ;DRAM Control Register II
- ;******************************************************************
-
- Bit=76 ;Additional Read Cycle Wait States 3+
- 00= Not used
- 01= 0 Waits
- 10= 1 Waits
- 11= 2 Waits
- Bit=54 ;Additional Write Cycle Wait States 2+
- 00= 0 Waits
- 01= 1 Waits
- 10= 2 Waits
- 11= 3 Waits
-
- Bit=3 ;Fast Decode Enable (für 20/25 Systeme ohne L2)
- 0=Disable (muss falls Cache an)
- 1=Enable (Base Waits r:2, w:1)
-
- Bit=2 ;unused
- Bit=10 ;ALCLK-Selection
- 00=CLK/6
- 01=CLK/4
- 10=CLK/3
- 11=CLK/2.5 (493)
- 11=CLK/5 (495SX,495SLC)
-
-
- INDEX=26H ; Shadow RAM Control Register III
- ;****************************************************************
-
- BIT=7 ; (493) unused
- ;0/1 (495SLC) Fast AT-Cycle
-
- BIT=6 ; Shadow RAM Copy enable for address area C0000h-EFFFFh
- 0=Read/write at AT-Bus
- 1=Read from AT-Bus, Write into Shadow RAM
-
- BIT=5 ;Shadow Write protect at address area C0000h-CFFFFh
- 0=Disabled
- 1=Enabled
-
- BIT=4 ;0/1 Shadow RAM at C0000h-CFFFFFh
-
- BIT=3 ;0/1 Shadow RAM at CC000h-CFFFFFh
-
- BIT=2 ;0/1 Shadow RAM at C8000h-CBFFFFh
-
- BIT=1 ;0/1 Shadow RAM at C4000h-C7FFFFh
-
- BIT=0 ;0/1 Shadow RAM at C0000h-C3FFFFh
-
- INDEX=27H ; Control Register 3
- ;****************************************************************
-
- BIT=7 ; Cacheable Function
- 0=DRAM Cacheable controlled by Bit 3-0
- 1=all DRAM are NON-cacheable
-
- BIT=6 ; (493) Unused
- BIT=5 ;1/0 (495SX,495SLC) Back-to-Back-I/O Cycle
-
- BIT=4 ; VIDEO BIOS at C0000h-C8000h area non-cacheable
- 0=Cacheable
- 1=Non-Cacheable
-
- BIT=3210 ; Cacheable Address-Range
- ; 32K-Cache: 8MB, 64K-Cache: 16MB,
- ; 128K-Cache:32MB, 256K-Cache: 64MB
- 0000=0..64MB
- 0001=0.. 4MB
- 0010=0.. 8MB
- 0011=0..12MB
- 0100=0..16MB
- 0101=0..20MB
- 0110=0..24MB
- 0111=0..28MB
- 1000=0..32MB
- 1001=0..36MB
- 1010=0..40MB
- 1011=0..44MB
- 1100=0..48MB
- 1101=0..52MB
- 1110=0..56MB
- 1111=0..60MB
-
- INDEX=28H ; Non-Cacheable Block 1 Register I
- ;****************************************************************
-
- BIT=765 ; Size of Non-cacheable Memory Block 1
- 000=64K
- 001=128K
- 010=256K
- 011=512K
- 1xx=Disabled
- BIT=432 ; Unused
-
- BIT=10 ;Address-Bits of non Cacheable Memory Block 1
- xx=A25..A24
-
- INDEX=29H ; Non-Cacheable Block 1 Register II
- ;****************************************************************
-
- BIT=76543210 ; Address-Bits of non Cacheable Memory Block 1
- xxxxxxxx=A23..A16
-
- INDEX=2AH ; Non-Cacheable Block 2 Register I
- ;****************************************************************
-
- BIT=765 ; Size of Non-cacheable Memory Block 1
- 000=64K
- 001=128K
- 010=256K
- 011=512K
- 1xx=Disabled
- BIT=432 ; Unused
-
- BIT=10 ;A25..A24 Address-Bits of non Cacheable Memory Block 1
-
- INDEX=2BH ; Non-Cacheable Block 2 Register II
- ;****************************************************************
-
- BIT=76543210 ; A23..A16 of non Cacheable Memory Block 1
-