CS5530A datasheet(65/259 Pages) NSC

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Functional Description (Continued)

Table 3-19. Parallel/Serial Idle Timer and Trap Related Registers

Bit

Description

F0 Index 81h

Power Management Enable Register 2 (R/W)

Reset Value = 00h

Parallel/Serial Idle Timer Enable: Load timer from Parallel/Serial Port Idle Timer Count Register (F0 Index 9Ch) and gen-

erate 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.

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

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

Second level SMI status is reported at F0 Index 85h/F5h[2].

F0 Index 82h

Power Management Enable Register 3 (R/W)

Reset Value = 00h

Parallel/Serial Trap: 0 = Disable; 1 = Enable.

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

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

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

Second level SMI status is reported at F0 Index 86h/F6h[2].

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 9Ch-9Dh

Parallel / Serial Idle Timer Count Register (R/W)

Reset Value = 0000h

15:0

Parallel / Serial Idle Timer Count: The idle timer loaded from this register is used to determine when the parallel and serial

ports are not in use so that the ports can be power managed. 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 the parallel (LPT) or serial (COM) I/O address spaces. If the mouse is enabled on a

serial port, that port is not considered here. The timer uses a 1 second timebase.

To enable this timer set F0 Index 81h[2] = 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[2].

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