SC2200 NSC [National Semiconductor], SC2200 Datasheet - Page 91

• Manufacturer Part Number: SC2200
• Description: Thin Client On a Chip
• Manufacturer: NSC [National Semiconductor]

Revision 3.0
General Configuration Block
3.4
The SC2200 provides an accurate time value that can be
used as a time stamp by system software. This time is
called the High-Resolution Timer. The length of the timer
value can be extended via software. It is normally enabled
while the system is in the C0 and C1 states. Optionally,
software can be programmed to enable use of the High-
Resolution Timer during C3 state and/or S1 state as well.
In all other power states the High-Resolution Timer is dis-
abled.
3.4.1
The High-Resolution Timer is a 32-bit free-running count-
up timer that uses the oscillator clock or the oscillator clock
divided by 27. Bit TMCLKSEL of the TMCNFG register
(Offset 0Dh[1]) can be set via software to determine which
clock should be used for the High-Resolution Timer.
When the most significant bit (bit 31) of the timer changes
from 1 to 0, bit TMSTS of the TMSTS register (Offset
0Ch[0]) is set to 1. When both bit TMSTS and bit TMEN
(Offset 0Dh[0]) are 1, an interrupt is asserted. Otherwise,
the interrupt is deasserted. This interrupt enables software
emulation of a larger timer.
The High-Resolution Timer interrupt is routed to an IRQ
signal. The IRQ signal is programmable via the INTSEL
register (Offset 38h). For more information about this regis-
ter, see section Section 3.2 "Multiplexing, Interrupt Selec-
tion, and Base Address Registers" on page 81.
System software uses the read-only TMVALUE register
(Offset 08h[31:0]) to read the current value of the timer.
The TMVALUE register has no default value.
HIGH-RESOLUTION TIMER
Functional Description
(Continued)
91
The input clock (derived from the 27 MHz crystal oscillator)
is enabled when:
• The GX1 module’s internal SUSPA# signal is 1.
or
• The GX1 module’s internal SUSPA# signal is 0 and bit
The input clock is disabled, when the GX1 module’s inter-
nal SUSPA# signal is 0 and the TM27MPD bit is 1.
For more information about signal SUSPA# see Section
3.4.2.1 "Usage Hints" on page 91 and the GX1 Processor
Series Datasheet .
The High-Resolution Timer function resides on the internal
Fast-PCI bus and its registers are in General Configuration
Block address space. Only one complete register should
be accessed at-a-time (e.g., DWORD access should be
used for DWORD wide registers and byte access should be
used for byte-wide registers).
3.4.2
Table 3-4 on page 92 describes the registers for the High-
Resolution Timer (TIMER).
3.4.2.1
• SMM code should set bit 2 of the TMCNFG register to 1
• SMM code should set bit 2 of the TMCNFG register to 1
TM27MPD (Offset 0Dh[2]) is 0.
when entering ACPI C3 state if the High-Resolution
Timer should be disabled. If this is not done, the High-
Resolution Timer is functional during C3 state.
when entering ACPI S1 state if the High-Resolution
Timer should be disabled. If this is not done, the High-
Resolution Timer is functional during S1 state.
High-Resolution Timer Registers
Usage Hints
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