參數(shù)資料
型號(hào)： 37C669
廠商： 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： 電腦98/99順從超級(jí)I / O軟盤控制器與紅外線支持
文件頁數(shù)： 101/164頁
文件大?。?/td> 621K
代理商： 37C669
41
COMMAND SET/DESCRIPTIONS
Commands can be written whenever the FDC is
in the command phase. Each command has a
unique set of needed parameters and status
results.
The FDC checks to see that the first
byte is a valid command and, if valid, proceeds
with the command. If it is invalid, an interrupt
is issued.
The user sends a Sense Interrupt
Status command which returns an invalid
command
error.
Refer
to
Table
18
or
explanations of the various symbols used.
Table 19 lists the required parameters and the
results associated with each command that the
FDC is capable of performing.
Table 18 - Description of Command Symbols
SYMBOL
NAME
DESCRIPTION
C
Cylinder Address
The currently selected address; 0 to 255.
D
Data Pattern
The pattern to be written in each sector data field during
formatting.
D0, D1, D2,
D3
Drive Select 0-3
Designates
which
drives
are
perpendicular
drives
on
the
Perpendicular Mode Command. A "1" indicates a perpendicular
drive.
DIR
Direction Control
If this bit is 0, then the head will step out from the spindle during a
relative seek. If set to a 1, the head will step in toward the spindle.
DS0, DS1
Disk Drive Select
DS1
DS0
DRIVE
0
drive 0
0
1
drive 1
1
0
drive 2
1
drive 3
DTL
Special Sector
Size
By setting N to zero (00), DTL may be used to control the number
of bytes transferred in disk read/write commands. The sector size
(N = 0) is set to 128. If the actual sector (on the diskette) is larger
than DTL, the remainder of the actual sector is read but is not
passed to the host during read commands; during write
commands, the remainder of the actual sector is written with all
zero bytes.
The CRC check code is calculated with the actual
sector. When N is not zero, DTL has no meaning and should be
set to FF HEX.
EC
Enable Count
When this bit is "1" the "DTL" parameter of the Verify command
becomes SC (number of sectors per track).
EFIFO
Enable FIFO
This active low bit when a 0, enables the FIFO. A "1" disables the
FIFO (default).
EIS
Enable Implied
Seek
When set, a seek operation will be performed before executing any
read or write command that requires the C parameter in the
command phase. A "0" disables the implied seek.
EOT
End of Track
The final sector number of the current track.
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