参数资料
型号: 37C669
厂商: SMSC Corporation
英文描述: DIODE SCHOTTKY SINGLE 25V 200mW 0.5V-vf 200mA-IFM 30mA-IF 2uA-IR SOD-323 3K/REEL
中文描述: 电脑98/99顺从超级I / O软盘控制器与红外线支持
文件页数: 94/164页
文件大小: 621K
代理商: 37C669
35
Table 15 - Status Register 1
BIT NO.
SYMBOL
NAME
DESCRIPTION
7
EN
End of
Cylinder
The FDC tried to access a sector beyond the final
sector of the track (255D).
Will be set if TC is not
issued after Read or Write Data command.
6
Unused. This bit is always "0".
5
DE
Data Error
The FDC detected a CRC error in either the ID field or
the data field of a sector.
4
OR
Overrun/
Underrun
Becomes set if the FDC does not receive CPU or DMA
service within the required time interval, resulting in
data overrun or underrun.
3
Unused. This bit is always "0".
2
ND
No Data
Any one of the following:
1. Read Data, Read Deleted Data command - the
FDC did not find the specified sector.
2. Read ID command - the FDC cannot read the ID
field without an error.
3. Read A Track command - the FDC cannot find the
proper sector sequence.
1
NW
Not Writeable WP pin became a "1" while the FDC is executing a
Write Data, Write Deleted Data, or Format A Track
command.
0
MA
Missing
Address Mark
Any one of the following:
1. The FDC did not detect an ID address mark at the
specified track after encountering the index pulse
from the IDX pin twice.
2. The FDC cannot detect a data address mark or a
deleted data address mark on the specified track.
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