DMP Electronics eBOX-3350MX-AP Manual de usuario descargar pdf (Pagina 31)

386SX Single Chip PC Jan Yin Chan Electronics Co.,LTD.

DM&P M6117D : System on a chip

Page 30

Jan Yin Chan Electronics Co,. LTD. M6117D 386SX Single Chip PC

8F-1,No.22,Wuchyuan 2RD.,Hsin Chuang city Taipei Hsien, Taiwan, R.O.C. Tel: 886-(02) 2298-0770 Fax: (02) 2299-1883

4.5 Power Management

In M6117D internal circuit, it has an internal signal SMIJ which is used to inform system to enter Power Management (Hyper

State Mode; HSM) space if an event happens. However, there are other extra choices to achieve power management. They

are NMI, IRQ3, IRQ4, IRQ5, IRQ6, IRQ7, IRQ9, IRQ10, IRQ11, IRQ12, IRQ14, and IRQ15. Chip only switches the SMI

signal to internal NMI or IRQs if it is selected when an event happens. Index 55h : D[1-0] and Index 38h : D[3-0] determine

which one is selected.

Please refer to Appendix A and B for CPU information in this section.

Index 55h

Index 55h : D[1-0] Index 38h : D[3-0] timing selection

00 xxxx SMI timing support

01 xxxx NMI timing support

10 xxxx IRQ15 timing support

11 0011 IRQ3 timing support

11 0100 IRQ4 timing support

11 0101 IRQ5 timing support

11 0110 IRQ6 timing support

11 0111 IRQ7 timing support

11 1001 IRQ9 timing support

11 1010 IRQ10 timing support

11 1011 IRQ11 timing support

11 1100 IRQ12 timing support

11 1110 IRQ14 timing support

11 others reserved

Notice that the system is not going to enter HSM space if you choose NMI or other IRQs timing support. All power

management using NMI and other IRQs timing are handled by software.

4.5.1 SMI Structure

Like other green CPUs, M6117 needs a special memory space to place Hyper State Mode (HSM) routine if you would like to

use M6117 deep green features. We can enter HSM space by hardware SMIJ (System Management Interrupt) or instruction

BRKPM, OP code : 0F1h, and return by instruction RETPM, OP code: 0D6h, 0E6h. How to use power management

functions efficiently to minimize the system power consumption is a challenge.

RESET

Nor mal

Me mo ry

Space

BIOS

application

HSM (Hyper State Mode)

Memory Space

Control Program

(Power Manager)

SMIJ

BRKPM (0F1h)

RETPM(0D6h,0E6h)

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 111 112

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