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SC2200 Datasheet(PDF) 222 Page - National Semiconductor (TI) |
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SC2200 Datasheet(HTML) 222 Page - National Semiconductor (TI) |
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222 / 433 page  www.national.com 222 Revision 3.0 Core Logic Module (Continued) Index 9Ch-9Dh Parallel / Serial Idle Timer Count Register (R/W) Reset Value: 0000h 15:0 Parallel/SerialIdle Timer Count. This idle timer 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 in this register 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. This counter uses a 1 second timebase. To enable this timer, set F0 Index 81h[2] = 1. Top level SMI status is reported at F1BAR0+I/O Offset 00h/02h[0]. Second level SMI status is reported at F0 Index 85h/F5h[2]. 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 in this register 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.) This counter uses a 1 second time base. To enable this timer, set F0 Index 81h[3] = 1. Top level SMI status is reported at F1BAR0+I/O Offset 00h/02h[0]. Second level SMI status is reported at F0 Index 85h/F5h[3]. Index A0h-A1h User Defined Device 1 Idle Timer Count Register (R/W) Reset Value: 0000h 15:0 User Defined Device 1 (UDEF1) Idle Timer Count. This idle timer determines when the device configured as User Defined Device 1 (UDEF1) is not in use so that it can be power managed. The 16-bit value programmed in this register represents the period of inactivity for this device after which the system is alerted via an SMI. The timer is automatically reloaded with the count value whenever an access occurs to memory or I/O address space configured in the F0 Index C0h (Base Address register) and F0 Index CCh (Control register). This counter uses a 1 second time base. To enable this timer, set F0 Index 81h[4] = 1. Top level SMI status is reported at F1BAR0+I/O Offset 00h/02h[0]. Second level SMI status is reported at F0 Index 85h/F5h[4]. Index A2h-A3h User Defined Device 2 Idle Timer Count Register (R/W) Reset Value: 0000h 15:0 User Defined Device 2 (UDEF2) Idle Timer Count. This idle timer determines when the device configured as UDEF2 is not in use so that it can be power managed. The 16-bit value programmed in this register represents the period of inactivity for this device after which the system is alerted via an SMI. The timer is automatically reloaded with the count value whenever an access occurs to memory or I/O address space configured in the F0 Index C4h (Base Address register) and F0 Index CDh (Control register). This counter uses a 1 second timebase. To enable this timer, set F0 Index 81h[5] = 1. Top level SMI status is reported at F1BAR0+I/O Offset 00h/02h[0]. Second level SMI status is reported at F0 Index 85h/F5h[5]. Index A4h-A5h User Defined Device 3 Idle Timer Count Register (R/W) Reset Value: 0000h 15:0 User Defined Device 3 (UDEF3) Idle Timer Count. This idle timer determines when the device configured as UDEF3 is not in use so that it can be power managed. The 16-bit value programmed in this register represents the period of inactivity for this device after which the system is alerted via an SMI. The timer is automatically reloaded with the count value whenever an access occurs to memory or I/O address space configured in the UDEF3 Base Address Register (F0 Index C8h) and UDEF3 Control Register (F0 Index CEh). This counter uses a 1 second timebase. To enable this timer, set F0 Index 81h[6] = 1. Top level SMI status is reported at F1BAR0+I/O Offset 00h/02h[0]. Second level SMI status is reported at F0 Index 85h/F5h[6]. Table 5-29. F0: PCI Header and Bridge Configuration Registers for GPIO and LPC Support (Continued) Bit Description |
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