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LPC47M14X 数据表(PDF) 38 Page - SMSC Corporation

部件名 LPC47M14X
功能描述  128 PIN ENGANCED SUPER I/O CONTROLLER WITH AN LPC INTERFACE AND USB HUB
PDF  205 Pages
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制造商  SMSC [SMSC Corporation]
网页  http://www.smsc.com
标志 SMSC - SMSC Corporation

LPC47M14X 数据表(HTML) 38 Page - SMSC Corporation

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SMSC DS – LPC47M14X
Page 38
Rev. 03/19/2001
Table 14 – 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 nINDEX pin twice.
2.
The FDC cannot detect a data address mark or a
deleted data address mark on the specified track.
Table 15 – Status Register 2
BIT NO.
SYMBOL
NAME
DESCRIPTION
7
Unused. This bit is always "0".
6
CM
Control Mark
Any one of the following:
Read Data command - the FDC encountered a deleted
data address mark.
Read Deleted Data command - the FDC encountered a
data address mark.
5
DD
Data Error in
Data Field
The FDC detected a CRC error in the data field.
4
WC
Wrong
Cylinder
The track address from the sector ID field is different
from the track address maintained inside the FDC.
3
Unused. This bit is always "0".
2
Unused. This bit is always "0".
1
BC
Bad Cylinder
The track address from the sector ID field is different
from the track address maintained inside the FDC and is
equal to FF hex, which indicates a bad track with a hard
error according to the IBM soft-sectored format.
0
MD
Missing Data
Address Mark
The FDC cannot detect a data address mark or a
deleted data address mark.



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