
Chapter 4
Registers
205
24674
Rev. 3.00
April 2003
AMD-8111 HyperTransport I/O Hub Data Sheet
AMD Preliminary Information
General Con
fi
guration 2 Register
DevB:3x41
Default:
41h.
Attribute:
See below.
SCI Interrupt Con
fi
guration Register
DevB:3x42
Default:
00h.
Attribute:
Read-write.
3
NTPER. Normal throttling period.
1=Normal throttling cycle period speci
fi
ed to be 244
microseconds (from an asserting edge of STPCLK_L to the next asserting edge). Minimum
LDTSTOP_L assertion during throttling if DevB:3x70[NTLS]=1 is 16us. 0=Normal throttling period
speci
fi
ed to be 30 microseconds. Minimum LDTSTOP_L assertion during throttling if
DevB:3x70[NTLS]=1 is 2us.
TTPER. Thermal throttling period.
1=Thermal throttling cycle period speci
fi
ed to be 244
microseconds (from an asserting edge of STPCLK_L to the next asserting edge). Minimum
LDTSTOP_L assertion during throttling if DevB:3x70[TTLS]=1 is 16us. If 0=Thermal throttling period
speci
fi
ed to be 30 microseconds. Minimum LDTSTOP_L assertion during throttling if
DevB:3x70[TTLS]=1 is 2us.
Reserved.
TH2SD. Throttling 2 second delay.
1=There is a 2.0 to 2.5 second delay after THERM_L is asserted
before thermal throttling is initiated, as speci
fi
ed by DevB:3x4D. 0=Initiate throttling immediately after
THERM_L is asserted.
2
1
0
Bits
7
Description
PMIOEN. System management I/O space enable.
Read-write. 1=PMxx, the I/O space speci
fi
ed by
DevB:3x58, is enabled.
TMRRST. ACPI timer reset.
Read-write. 1=The ACPI timer, PM08, is asynchronously cleared at all
times. 0=The timer is allowed to count.
PCF9EN. Port CF9 enable.
Read-write. 1=Access to PORTCF9 is enabled.
PBIN. Power button in.
Read-only. This bit re
fl
ect the current state of the PWRBTN_L pin (before the
debounce circuit). 0=PWRBTN_L is currently asserted.
TMR32. Timer size selection.
Read-write. 0=The ACPI timer, PM08, is 24 bits. 1=The ACPI timer is
32 bits.
Reserved.
Must be High.
Read-write. This bit is required to be High at all times; setting it Low results in
unde
fi
ned behavior.
6
5
4
3
2:1
0
Bits
7:4
3:0
Description
Reserved.
SCISEL. SCI interrupt selection.
This
fi
eld speci
fi
es the IRQ number routed to the interrupt
controllers used for ACPI-de
fi
ned SCI interrupts. A value of 0h disables SCI interrupts. Values of 2h,
8h, and Dh are reserved. All other values are valid. See Section 3.4.2.1 on page 41 for details about
SCI interrupt routing.
Bits
Description