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參數(shù)資料
型號: W83877TF
廠商: WINBOND ELECTRONICS CORP
元件分類: 外設及接口
英文描述: Multi-Function I/O Port Controller(用于個人計算機的多功能輸入/輸出口控制器)
中文描述: MULTIFUNCTION PERIPHERAL, PQFP100
封裝: QFP-100
文件頁數(shù): 102/154頁
文件大小: 821K
代理商: W83877TF
W83877TF
Publication Release Date: March 1998
- 76 -
Version 0.61
8.2.8 Configuration Register 7 (CR7), default = 00H
When the device is in Extended Function mode and EFIR is 07H, the CR7 register can be accessed
through EFDR. The bit definitions are as follows:
7 6 5 4 3 2 1 0
FDD A type 0
FDD A type 1
FDD B type 0
FDD B type 1
FDD C type 0
FDD C type 1
FDD D type 0
FDD D type 1
FDD D type 1, 0 (Bit 7, 6):
These two bits select the type of FDD D.
00
Selects normal mode. When RWC = 0, the data transfer rate is 250 Kb/s. When
RWC = 1, the data transfer rate is 500 Kb/s.
Three mode FDD select (EN3MODE = 1):
01
RWC = 0, selects 1.2 MB high-density FDD.
10
RWC = 1, selects 1.44 MB high-density FDD.
11
Don't care RWC, selects 720 KB double-density FDD.
FDD C type 1, 0 (Bit 5, 4):
These two bits select the type of FDD C.
00
Selects normal mode. When RWC = 0, the data transfer rate is 250 kb/s. When
RWC = 1, he data transfer rate is 500 kb/s.
Three mode FDD select (EN3MODE = 1):
01
RWC = 0, selects 1.2 MB high-density FDD.
10
RWC = 1, selects 1.44 MB high-density FDD.
11
Don't care RWC, selects 720 KB double-density FDD.
FDD B type 1, 0 (Bit 3, 2):
These two bits select the type of FDD B.
00
Selects normal mode. When
RWC = 0, the data transfer rate is 250 Kb/s. When
RWC = 1, the data transfer rate is 500 Kb/s.
Three mode FDD select (EN3MODE = 1):
01
RWC = 0, selects 1.2 MB high-density FDD.
10
RWC = 1, selects 1.44 MB high-density FDD.
11
Don't care
RWC, selects 720 KB double-density FDD.
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