AMD-766AC AMD [Advanced Micro Devices], AMD-766AC Datasheet - Page 47

• Manufacturer Part Number: AMD-766AC
• Description: Peripheral Bus Controller
• Manufacturer: AMD [Advanced Micro Devices]

23167B – March 2001
OCW1: Operation Command Word 1 Register
Fixed IO space; offset: 21h for master and A1h for slave. Write only.
Bits
OCW2: Operation Command Word 2 Register
Fixed IO space; offset: 20h for master and A0h for slave; data bits[4:3] must be 00b. Write only.
OCW3: Operation Command Word 3 Register
Fixed IO space; offset: 20h for master and A0h for slave; data bits[4:3] must be 01b. Write only.
Bits
Bits
7:0
7:5
4:3
2:0
6:5
4:3
1:0
7
2
Description
MASK[7:0]. Interrupt mask. 1=Interrupt is masked. Masking IRQ2 on the master interrupt controller
masks all slave-controller interrupts.
Description
R (bit 7), SL (bit 6), and EOI (bit 5). These are decoded as:
*
**
Reserved (must be programmed all zeros).
IRLEVEL. Interrupt request level. Specifies the interrupt request level to be acted upon.
Description
Must be programmed low.
ESMM (bit 6) and SMM (bit 5). Special mask mode. These are decoded as:
01b
P: poll command. 1=Poll enabled; next IO read of the interrupt controller treated like an interrupt
acknowledge cycle.
RR (bit 1) and RIS (bit 0). Read register command. These are decoded as:
R, SL, EOI Function
[ESMM, SMM] = 0Xb
[ESMM, SMM] = 10b
[ESMM, SMM] = 11b
[RR,RIS] = 0Xb
[RR,RIS] = 10b
[RR,RIS] = 11b
000b
001b
010b
011b
Not supported.
Uses IRLEVEL field.
* Rotate in auto EOI mode clear.
Non-specific EOI mode.
No operation.
Specific EOI command.
No action.
Reset special mask mode.
Set special mask mode.
No action.
Read in-request (IR) register.
Read IS register.
Preliminary Information
AMD-766
R, SL, EOI Function
100b
101b
110b
111b
TM
Peripheral Bus Controller Data Sheet
* Rotate in auto EOI mode set
Rotate on non-specific EOI command
** Set priority command
** Rotate on specific EOI command
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