CY82C693UB Cypress Semiconductor Corporation., CY82C693UB Datasheet - Page 70

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

Special I/O Port Registers
The following ports are used for special functions. They are
accessed by performing I/O transactions to the address spec-
ified.
Port 61: System Control Port B, NMI (Read/Write) - I/O Address=061H
Port 70: RTC/Configuration RAM Address Port, NMI (Write) - I/O Address=070H
Port 92: PS/2 Reset Control (Read/Write) - I/O Address=092H
Bit
7
6
5
4
3
2
1
0
Bit
7
6:0
Bit
7:2
1
0
Function
Read Only. PCI System Error (SERR) check:
0:
1:
Read Only. I/O channel check:
0:
1:
Read Only. Timer 2 output:
0:
1:
Read Only. Refresh detection:
0:
1:
Read/Write port. I/O channel check:
0:
1:
When enabled an I/O channel error will generate an NMI to the CPU.
Read/Write port. PCI System Error (SERR) check:
0:
1:
When enabled a PCI system error will generate an NMI to the CPU.
Read/Write port. Speaker data.
Read/Write. Timer 2 speaker gate:
0:
1:
Function
NMI reporting:
0:
1:
Sources of NMI can be either from ISA I/O channel error or PCI SERR depending on bits 3
and 2 of register port 61.
Extended CMOS RAM
See CY82C693UB Real-Time Clock Register section.
Function
Reserved
GTA20 Control:
0:
1:
Fast Reset Control:
0:
1:
No error
PCI SERR detected
No error
I/O channel error detected (ISA IOCHK signal asserted)
Timer 2 (speaker) output is low
Timer 2 output is high
Refresh request not detected
Refresh request detected
Enable I/O channel check
Disable I/O channel check
Enable PCI SERR check
Disable PCI SERR check
Timer 2 speaker gate disabled
Timer 2 speaker gate enabled
Enable NMI reporting
Disable NMI reporting
Activate GTA20.
Deactivate GTA20.
INIT deactivated. Will occur automatically after reset timer expires.
Assert INIT.
PRELIMINARY
70
CY82C693UB
Default
0
0
0
0
0
0
0
0
Default
0
0000000
Default
00000000
0
0