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參數(shù)資料
型號: W83977TF
廠商: WINBOND ELECTRONICS CORP
英文描述: Multi-Function I/O Port Controller(用于個人計算機(jī)的多功能輸入/輸出口控制器)
中文描述: 多功能I / O端口控制器(用于個人計算機(jī)的多功能輸入/輸出口控制器)
文件頁數(shù): 88/160頁
文件大小: 1012K
代理商: W83977TF
W83977TF
PRELIMINARY
Publication Release Date:March 1998
-78 -
Revision 0.62
9.1
SMI to SCI/SCI to SMI and Bus Master
The following figure illustrates the process of generating an interrupt from SMI
to SCI
or from
SCI
to
SMI.
BIOS_RLS
GBL_EN
from SCI to SMI
GBL_RLS
BIOS_EN
BUS Master SCI
BM_CNTPL
BM_RLD
clear
set
BM_STS
To SCI Logic
To SMI Logic
To SCI Logic
from SMI to SCI
clear
set
clear
set
GBL_STS
BIOS_STS
: Status bit
: Enable bit
For the BIOS software to raise an event to the ACPI software, BIOS_RLS, GBL_EN, and GBL_STS
bits are involved. GBL_EN is the enable bit and the GBL_STS is the status bit. Both are controlled
by the ACPI software. If BIOS_RLS is set by the BIOS software and GBL_EN is set by the ACPI
software, an
SCI
interrupt is raised. Writing a 1 to BIOS_RLS sets it to logic 1 and also sets
GBL_STS to logic 1. Writing a 0 to BIOS_RLS has no effect. Wrinting a 1 to GBL_STS clears it to
logic 0 and also clears BIOS_RLS to logic 0. Writing a 0 to GBL_STS has no effect.
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