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參數(shù)資料
型號: W83877TF
廠商: WINBOND ELECTRONICS CORP
元件分類: 外設(shè)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): 38/154頁
文件大小: 821K
代理商: W83877TF
W83877TF
Publication Release Date: March 1998
- 28 -
Version 0.61
2.2 Register Descriptions
There are several status, data, and control registers in W83877TF. These registers are defined below:
ADDRESS
OFFSET
base address + 0
base address + 1
base address + 2
base address + 3
base address + 4
base address + 5
base address + 7
REGISTER
READ
WRITE
SA REGISTER
SB REGISTER
TD REGISTER
MS REGISTER
DT (FIFO) REGISTER
DI REGISTER
DO REGISTER
TD REGISTER
DR REGISTER
DT (FIFO) REGISTER
CC REGISTER
2.2.1 Status Register A (SA Register) (Read base address + 0)
This register is used to monitor several disk interface pins in PS/2 and Model 30 modes. In PS/2
mode, the bit definitions for this register are as follows:
1
2
3
4
5
6
7
0
WP
INDEX
HEAD
TRAK0
STEP
DRV2
INIT PENDING
DIR
INIT PENDING (Bit 7):
This bit indicates the value of the floppy disk interrupt output.
DRV2 (Bit 6):
0
A second drive has been installed
1
A second drive has not been installed
STEP (Bit 5):
This bit indicates the complement of STEP output.
TRAK0 (Bit 4):
This bit indicates the value of TRAK0 input.
HEAD (Bit 3):
This bit indicates the complement of HEAD output.
0
side 0
1
side 1
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