參數(shù)資料
型號: FDC37C665IR
廠商: SMSC Corporation
英文描述: 3/5 Volt Advanced High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controller with Infranred Support
中文描述: 3 / 5伏先進(jìn)的高性能多模并口超級I / O軟盤與Infranred支持磁盤控制器
文件頁數(shù): 60/162頁
文件大?。?/td> 562K
代理商: FDC37C665IR
60
If the FDC detects a pulse on the nINDEX pin
twice without finding the specified sector
(meaning that the diskette's index hole passes
through index detect logic in the drive twice), the
FDC sets the IC code in Status Register 0 to
"01" indicating abnormal termination, sets the
ND bit in Status Register 1 to "1" indicating a
sector not found, and terminates the Read Data
Command.
After reading the ID and Data Fields in each
sector, the FDC checks the CRC bytes. If a
CRC error occurs in the ID or data field, the
FDC sets the IC code in Status Register 0 to
"01" indicating abnormal termination, sets the
DE bit flag in Status Register 1 to "1", sets the
DD bit in Status Register 2 to "1" if CRC is
incorrect in the ID field, and terminates the Read
Data Command. Table 24 describes the effect
of the SK bit on the Read Data command
execution and results. Except where noted in
Table 24, the C or R value of the sector address
is automatically incremented (see Table 26).
Table 23 - Effects of MT and N Bits
MAXIMUM TRANSFER
CAPACITY
256 x 26 = 6,656
256 x 52 = 13,312
512 x 15 = 7,680
512 x 30 = 15,360
1024 x 8 = 8,192
1024 x 16 = 16,384
MT
N
FINAL SECTOR READ
FROM D
ISK
26 at side 0 or 1
26 at side 1
15 at side 0 or 1
15 at side 1
8 at side 0 or 1
16 at side 1
0
1
0
1
0
1
1
1
2
2
3
3
Table 24 - Skip Bit vs Read Data Command
DATA ADDRESS
MARK TYPE
ENCOUNTERED
SECTOR
READ
Normal Data
Yes
SK BIT
VALUE
RESULTS
CM BIT OF
ST2 SET
No
DESCRIPTION
OF RESULTS
Normal
termination.
Address not
incremented.
Next sector not
searched for.
Normal
termination.
Normal
termination.
Sector not read
("skipped").
0
0
1
1
Deleted Data
Normal Data
Deleted Data
Yes
Yes
No
Yes
No
Yes
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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