
Chapter 4
Registers
233
24674
Rev. 3.00
April 2003
AMD-8111 HyperTransport I/O Hub Data Sheet
AMD Preliminary Information
Read write Register
PM4C
All these bits reside on the VDD_COREX power plane.
Default:
0000h.
Attribute:
Read-write.
Timer and Device Monitor Registers
PM[8C:50] Bits[19:0]
Each of these registers provide access to the re-trigger timers. Each timer decrements at a rate
specified by CLKSRC when enabled. Each timer is associated with device monitor events including
address traps, DMA acknowledge cycles and interrupt requests. Each time a device monitor event
associated with a re-trigger timer occurs, the timer is reloaded. So, if the hardware is regularly
accessed, then the timer never reaches zero. If the timer decrements past zero, then it is disabled from
counting further (staying at zero) and the appropriate device monitor status bit is set. Here is a
summary of the device monitor events associated with these registers:
Table 58.
Device Monitor Events
Bits
31:24 Reserved.
23:0
RW.
These bits control no hardware.
Description
Register Function
Address specification; DMA channels;
IRQs
I/O space 3F0h-3F5h, 3F7h, or 370h-375h,
377h
fi
xed; DMA channel 2 in PM50
See PM54; one of DMA[3:0]; see note.
See PM58
See PM5C
See PM60; any or all or DMA[7:5, 3:0]
Memory space 0A0000h-0BFFFFh
fi
xed; I/O
space 3B0h-3DFh, 60h, 64h; IRQ1, IRQ12
PM50
Access to the primary or secondary
fl
oppy disk
controllers.
Access to the parallel ports.
Access to serial port COMA. (modem)
Access to serial port COMB. (IR)
Access to the audio hardware.
User Interface: access to the video adapter; access to
the legacy keyboard and PS/2 mouse ports; PCI bus
utilization
PIO access to any IDE drives.
Access to CARDBUS 0.
Access to CARDBUS 1.
Timer.
Access to programmable I/O range monitor 1.
Access to programmable I/O range monitor 2.
Access to programmable I/O range monitor 3.
Access to programmable I/O range monitor 4.
Access to programmable memory/con
fi
g range
monitor 1.
Access to programmable memory/con
fi
g range
monitor 2.
PM54
1
PM58
PM5C
PM60
PM64
PM68
PM6C
PM70
PM74
PM78
PM7C
PM80
PM84
PM88
I/O address space speci
fi
ed by DevB:1xXX
Address in space DevB:3xB4, DevB:3xB8,
DevB:3xBC, DevB:3xC0
None.
Address in space DevB:3xC4, DevB:3xC8,
DevB:3xCC
Address in space DevB:3xD0, DevB:3xD4,
PM8C
DevB:3xD8
Notes:
1. PM54 can alternately be used as an inactivity timer for PCI bus master activity based on REQ_L[6:0], PREQ_L,
and internal master requests.