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CS5530 Datasheet

  • CS5530

  • National Semiconductor [Geode⑩ CS5530 I/O Companion Multi-...

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  • NSC

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Geode鈩?CS5530
Functional Description
(Continued)
3.4.3.2 General Purpose Timers
The CS5530 contains two general purpose idle timers,
General Purpose Timer 1 (F0 Index 88h) and General
Purpose Timer 2 (F0 Index 8Ah). These two timers are
similar to the Device Idle Timers in that they count down
to zero unless re-triggered, and generate an SMI when
they reach zero. However, these are 8-bit timers instead
of 16 bits, they have a programmable timebase, and the
events which reload these timers are configurable. These
timers are typically used for an indication of system inac-
tivity for Suspend determination.
General Purpose Timer 1 can be re-triggered by activity to
any of the configured user defined devices, keyboard and
mouse, parallel and serial, floppy disk, or hard disk.
General Purpose Timer 2 can be re-triggered by a transi-
tion on the GPIO7 pin (if GPIO7 is properly configured).
Configuration of the GPIO7 is explained in Section 3.4.3.4
鈥淕eneral Purpose I/O Pins鈥?on page 73.
When a General Purpose Timer is enabled or when an
event reloads the timer, the timer is loaded with the config-
ured count value. Upon expiration of the timer an SMI is
generated and a status flag is set. Once expired, this
counter must be re-initialized by disabling and enabling it.
The timebase for both General Purpose Timers can be
configured as either 1 second (default) or 1 millisecond.
The registers at F0 Index 89h and 8Bh are the control reg-
isters for the General Purpose Timers. Table 3-27 show
the bit formats for these registers.
Table 3-27. General Purpose Timers and Control Registers
Bit
Description
General Purpose Timer 1 Count Register (R/W)
Reset Value = 00h
F0 Index 88h
7:0
General Purpose Timer 1 Count:
This field represents the load value for GP Timer 1. This value can represent either an
8-bit or 16-bit counter (selected in F0 Index 8Bh[4]). It is loaded into the counter when the timer is enabled (F0 Index
83h[0] =1). Once enabled, an enabled event (configured in F0 Index 89h[6:0]) reloads the timer.
The counter is decremented with each clock of the configured timebase. Upon expiration of the counter, an SMI is gener-
ated and the top level SMI status is reported at F1BAR+Memory Offset 00h/02h[9]. The second level SMI status is
reported at F1BAR+Memory Offset 04h/06h[0]).
Once expired, this counter must be re-initialized by either disabling and enabling it, or writing a new count value here.
This counter鈥檚 timebase can be configured as 1 msec or 1 sec at F0 Index 89h[7].
F0 Index 89h
7
6
General Purpose Timer 1 Control Register (R/W)
Reset Value = 00h
Timebase for General Purpose Timer 1:
Selects timebase for GP Timer 1 (F0 Index 88h): 0 = 1 sec; 1 = 1 msec.
Re-trigger General Purpose Timer 1 on User Defined Device 3 (UDEF3) Activity:
0 = Disable; 1 = Enable.
Any access to the configured (memory or I/O) address range for UDEF3 reloads GP Timer 1. UDEF3 address
programming is at F0 Index C8h (base address register) and CEh (control register).
5
Re-trigger General Purpose Timer 1 on User Defined Device 2 (UDEF2) Activity:
0 = Disable; 1 = Enable.
Any access to the configured (memory or I/O) address range for UDEF2 reloads GP Timer 1. UDEF2 address
programming is at F0 Index C4h (base address register) and CDh (control register).
4
Re-trigger General Purpose Timer 1 on User Defined Device 1 (UDEF1) Activity:
0 = Disable; 1 = Enable.
Any access to the configured (memory or I/O) address range for UDEF1 reloads GP Timer 1. UDEF1 address
programming is at F0 Index C0h (base address register) and CCh (control register)
3
Re-trigger General Purpose Timer 1 on Keyboard or Mouse Activity:
0 = Disable; 1 = Enable
Any access to the keyboard or mouse I/O address range (listed below) reloads GP Timer 1.
Keyboard Controller: I/O Ports 060h/064h
COM1: I/O Port 3F8h-3FFh (if F0 Index 93h[1:0] = 10 this range is included)
COM2: I/O Port 2F8h-2FFh (if F0 Index 93h[1:0] = 11 this range is included)
2
Re-trigger General Purpose Timer 1 on Parallel/Serial Port Activity:
0 = Disable; 1 = Enable.
Any access to the parallel or serial port I/O address range (listed below) reloads the GP Timer 1.
LPT1: I/O Port 378h-37Fh, 778h-77Ah
LPT2: I/O Port 278h-27Fh, 678h-67Ah
COM1: I/O Port 3F8h-3FFh (if F0 Index 93h[1:0] = 10 this range is excluded)
COM2: I/O Port 2F8h-2FFh (if F0 Index 93h[1:0] = 11 this range is excluded)
COM3: I/O Port 3E8h-3EFh
COM4: I/O Port 2E8h-2EFh
1
Re-trigger General Purpose Timer 1 on Floppy Disk Activity:
0 = Disable; 1 = Enable.
Any access to the floppy disk drive address ranges (listed below) reloads GP Timer 1.
Primary floppy disk: I/O Port 3F2h-3F5h, 3F7h
Secondary floppy disk: I/O Port 372h-375h, 377h
The active floppy drive is configured via F0 Index 93h[7].
0
Re-trigger General Purpose Timer 1 on Primary Hard Disk Activity:
0 = Disable; 1 = Enable.
Any access to the primary hard disk drive address range selected in F0 Index 93h[5] reloads GP Timer 1.
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