CY82C693UB Cypress Semiconductor Corporation., CY82C693UB Datasheet - Page 117

• Manufacturer Part Number: CY82C693UB
• Description: Hypercache Tm / Stand-alone Pci Peripheral Controller With Usb
• Manufacturer: Cypress Semiconductor Corporation.

Register 17: PCI BIOS Control Register (Read/Write)
Register 18: ISA/DMA Top of Memory Control (Read/Write)
Bit
7
6
5
4
3
2
1
0
Bit
7:4
3
2
1
0
Function
Extended BIOS Control (Addresses FFF80000H–FFFDFFFFH):
0:
1:
Low BIOS Control (Addresses 000E0000H–000EFFFFH and FFFE0000H–FFFEFFFFH):
0:
1:
ROM Write-protect Control:
0:
1:
Block D BIOS Control (Addresses 000D0000H–000DFFFFH):
0:
1:
Block C BIOS Control (Addresses 000C0000H–000CFFFFH):
0:
1:
External Keyboard Controller Status (This bit is Read Only):
0:
1:
External Real-Time-Clock Status (This bit is Read Only):
0:
1:
External XD Buffer Status (This bit is Read Only):
0:
1:
Function
Top of ISA Memory:
0000:
0001:
0010:
0011:
0100:
0101:
0110:
0111:
ISA/DMA Low BIOS Forwarding Control
0:
1:
ISA/DMA 512K-640K BIOS Forwarding Control
0:
1:
ISA/DMA 832K-896K BIOS Forwarding Control
0:
1:
ISA/DMA 768K-832K BIOS Forwarding Control
0:
1:
Disable ROM Address Mapping from FFF80000H to FFFDFFFFH
Generate ROMCS for addresses between FFF80000H–FFFDFFFFH
Disable Low ROM Address Mapping
Generate ROMCS for Low ROM addresses
ROMCS will only become active on ROM reads (ROM is Read Only).
ROMCS will become active on ROM reads and writes.
Disable ROM Address Mapping from 000D0000H–000DFFFFH
Generate ROMCS for addresses between 000D0000H–000DFFFFH
Disable ROM Address Mapping from 000C0000H–000CFFFFH
Generate ROMCS for addresses between 000C0000H–000CFFFFH
Internal Keyboard Controller is in use.
External Keyboard Controller is in use. (Internal Keyboard Controller is disabled.)
Internal RTC is in use.
External RTC is in use. (Internal RTC is disabled.)
CY82C693UB XD Bus is in use.
External buffer is in use to buffer the XD bus.
1 MByte
2 MByte
3 MByte
4 MByte
5 MByte
6 MByte
7 MByte
8 MByte
Disable ISA/DMA Low BIOS Forwarding
Enable ISA/DMA Low BIOS Forwarding
Disable ISA/DMA 512K–640K BIOS Forwarding
Enable ISA/DMA 512K–640K BIOS Forwarding
Disable ISA/DMA 832K–896K BIOS Forwarding
Enable ISA/DMA 832K–896K BIOS Forwarding
Disable ISA/DMA 768K–832K BIOS Forwarding
Enable ISA/DMA 768K–832K BIOS Forwarding
PRELIMINARY
1000:
1001:
1010:
1011:
1100:
1101:
1110:
1111:
9 MByte
10 MByte
11 MByte
12 MByte
13 MByte
14 MByte
15 MByte
16 MByte
Index=47H with an 8-bit access
117
Index=48H with an 8-bit access
CY82C693UB
Default
0
0
0
0
0
0
0
0
Default
0
0
0
0
0