307013-003 Datasheet, PDF (759/848 Pages) Intel Corporation – Intel I/O Controller Hub 7

High Precision Event Timer Registers
20 High Precision Event Timer
Registers
20.1
The timer registers are memory-mapped in a non-indexed scheme. This allows the
processor to directly access each register without having to use an index register. The
timer register space is 1024 bytes. The registers are generally aligned on 64-bit
boundaries to simplify implementation with IA64 processors. There are four possible
memory address ranges beginning at 1) FED0_0000h, 2) FED0_1000h, 3)
FED0_2000h., 4) FED0_4000h. The choice of address range will be selected by
configuration bits in the High Precision Timer Configuration Register (Chipset
Configuration Registers:Offset 3404h).
Behavioral Rules:
1. Software must not attempt to read or write across register boundaries. For
example, a 32-bit access should be to offset x0h, x4h, x8h, or xCh. 32-bit accesses
should not be to 01h, 02h, 03h, 05h, 06h, 07h, 09h, 0Ah, 0Bh, 0Dh, 0Eh, or 0Fh.
Any accesses to these offsets will result in an unexpected behavior, and may result
in a master abort. However, these accesses should not result in system hangs. 64-
bit accesses can only be to x0h and must not cross 64-bit boundaries.
2. Software should not write to read-only registers.
3. Software should not expect any particular or consistent value when reading
reserved registers or bits.
Memory Mapped Registers
Table 20-1. Memory-Mapped Registers (Sheet 1 of 2)
Offset
Mnemonic
Register
000–007h GCAP_ID General Capabilities and Identification
008–00Fh
010–017h
018–01Fh
—
GEN_CONF
—
Reserved
General Configuration
Reserved
020–027h GINTR_STA General Interrupt Status
028–0EFh
0F0–0F7h
0F8–0FFh
100–107h
108–10Fh
110–11Fh
120–127h
128–12Fh
130–13Fh
—
Reserved
MAIN_CNT Main Counter Value
—
Reserved
TIM0_CONF Timer 0 Configuration and Capabilities
TIM0_COMP Timer 0 Comparator Value
—
Reserved
TIM1_CONF Timer 1 Configuration and Capabilities
TIM1_COMP Timer 1 Comparator Value
—
Reserved
Default
Type
0429B17F8
086A201h
RO
—
0000h
—
—
R/W
—
00000000 _{R/WC, R/}
00000000h ^W
—
—
N/A
R/W
—
—
N/A
R/W, RO
N/A
R/W
—
—
N/A
R/W, RO
N/A
R/W
—
—
Intel ^® ICH7 Family Datasheet
759