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Register Descriptions
2-40 Intel® 460GX Chipset Software Developer’s Manual
0 Event 0 Input
This bit is fed an input into Event 0 logic. This bit is OR’ed with any other logic
generating Event 0, guaranteeing that if this bit is set, then Event 0 will be asserted.
2.5.4.4 AGP_PMC_[0,1]: AGP Performance Monitor Configuration Register
Function Number: BFN+1
Address Offset: ECh, F0h Size: 32 bits
Default Value: 000000h Attribute: Read/Write
Sticky: No Locked: No
The AGP_G_PMC Register specifies the configuration of the GXB AGP Performance Monitor.
This includes specifying Event Selection, Unit Mask, Enable & Disable Source and Reload
Control.
Bits
Description
31:24 ’n’ for threshold Monitoring
23:20 reserved(0).
19:18 Events to monitor, when Event Select Code points to events. Data Transfer is one
QW (8 bytes). Used also for code 11 0000
00 - All events
01 - Events with ’n’ Data Transfer Cycles
02 - Events with < ’n’ Data Transfer Cycles
03 - Events with > ’n’ Data Transfer Cycles
17:16 Pipe or Sideband Request Mask
00b reserved.
01b Selects Low Priority.
10b Selects High Priority.
11b Selects Both.
15:14 reserved(0).
13:8 Event Select
Selects the event to be monitored.
00 0000b Monitoring Disabled.
00 0001b AGP Read Request Events.
00 0010b AGP Write Request Events.
00 0011b All AGP Request Events (does not include Flush or Fence requests).
00 0101b Singe Read that splits 4k page boundary.
00 0110b Single Write that splits line boundary.
01 0000b Flushes (events)
01 0001b Fences (events)
01 0010b RBF# active events.
01 0011b Events of write wait states inserted by AGP card
01 0100b Events of LPTT timeout with another request active.
01 0101b Events of MTT timeout with another request active.
01 0111b GART Aperture Misses
10 0000b AGP Clocks.
10 0100b Count AGP clocks that RBF# is stalled
10 0101b Count AGP clocks that low-priority read buffer is physically empty.
10 0110b Count AGP clocks that high-priority read buffer is physically empty.
10 0111b Count AGP clocks that both the low and high priority buffers are empty.
11 0000b Count AGP clocks that there are <=> ’n’ requests queued; using bits 31:24 and
19:18.