 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
W83977EF-AW Datasheet(PDF) 38 Page - Winbond |
|
||||||||||||||||||||||||||||||
W83977EF-AW Datasheet(HTML) 38 Page - Winbond |
|
|
38 / 142 page  W83977EF-AW/W83977EG-AW -36- 5.2.3 Digital Output Register (DO Register) (Write base address + 2) The Digital Output Register is a write-only register controlling drive motors, drive selection, DRQ/IRQ enable, and FDC resetting. All the bits in this register are cleared by the MR pin. The bit definitions are as follows: 76 54 3 2 1-0 Drive Select: 00 select drive A 01 select drive B 10 select drive C 11 select drive D Floppy Disk Controller Reset Active low resets FDC DMA and INT Enable Active high enable DRQ/IRQ Motor Enable A. Motor A on when active high Motor Enable B. Motor B on when active high Motor Enable C. Motor C on when active high Motor Enable D. Motor D on when active high 5.2.4 Tape Drive Register (TD Register) (Read base address + 3) This register is used to assign a particular drive number to the tape drive support mode of the data separator. This register also holds the media ID, drive type, and floppy boot drive information of the floppy disk drive. In normal floppy mode, this register includes only bit 0 and 1. The bit definitions are as follows: 1 2 3 4 5 6 7 0 Tape sel 0 Tape sel 1 XX XX X X If three mode FDD function is enabled (EN3MODE = 1 in CR9), the bit definitions are as follows: 1 2 3 4 5 6 7 0 Floppy boot drive 0 Floppy boot drive 1 Drive type ID0 Drive type ID1 Media ID0 Media ID1 Tape Sel 0 Tape Sel 1 Media ID1 Media ID0 (Bit 7, 6): These two bits are read only. These two bits reflect the value of CR8 bit 3, 2. Drive type ID1 Drive type ID0 (Bit 5, 4): These two bits reflect two of the bits of CR7. Which two bits are reflected depends on the last drive selected in the DO REGISTER. |
Similar Part No. - W83977EF-AW |
|
Similar Description - W83977EF-AW |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
