CS5530 datasheet(61/241 Pages) NSC

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Functional Description (Continued)

Table 3-17. Keyboard/Mouse Idle Timer and Trap Related Registers

Bit

Description

F0 Index 81h

Power Management Enable Register 2 (R/W)

Reset Value = 00h

Keyboard/Mouse Idle Timer Enable: Turn on Keyboard/Mouse Idle Timer Count Register (F0 Index 9Eh) and generate

an SMI when the timer expires: 0 = Disable; 1 = Enable.

If an access occurs in the address ranges (listed below) the timer is reloaded with the programmed count.

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)

Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].

Second level SMI status is reported at F0 Index 85h/F5h[3].

F0 Index 82h

Power Management Enable Register 3 (R/W)

Reset Value = 00h

Keyboard/Mouse Trap: 0 = Disable; 1 = Enable.

If this bit is enabled and an access occurs in the address ranges (listed below) an SMI is generated.

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)

Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].

Second level SMI status is reported at F0 Index 86h/F6h[3].

F0 Index 93h

Miscellaneous Device Control Register (R/W)

Reset Value = 00h

Mouse on Serial Enable: Mouse is present on a Serial Port: 0 = No; 1 = Yes. (Note)

Mouse Port Select: Selects which serial port the mouse is attached to: 0 = COM1; 1 = COM2. (Note)

Note: Bits 1 and 0 - If a mouse is attached to a serial port (bit 1 = 1), that port is removed from the serial device list being used to

monitor serial port access for power management purposes and added to the keyboard/mouse decode. This is done because

a mouse, along with the keyboard, is considered an input device and is used only to determine when to blank the screen.

These bits determine the decode used for the Keyboard/Mouse Idle Timer Count Register (F0 Index 9Eh) as well as the Paral-

lel/Serial Port Idle Timer Count Register (F0 Index 9Ch).

F0 Index 9Eh-9Fh

Keyboard / Mouse Idle Timer Count Register (R/W)

Reset Value = 0000h

15:0

Keyboard / Mouse Idle Timer Count: This idle timer determines when the keyboard and mouse are not in use so that

the LCD screen can be blanked. The 16-bit value programmed here represents the period of inactivity for these ports

after which the system is alerted via an SMI. The timer is automatically reloaded with the count value whenever an

access occurs to either the keyboard or mouse I/O address spaces, including the mouse serial port address space when

a mouse is enabled on a serial port. The counter uses a 1 second timebase.

To enable this timer set F0 Index 81h[3] = 1.

Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].

Second level SMI status is reported at F0 Index 85h/F5h[3].

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