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| 型號(hào)： | 37C67X |
| 廠商： | SMSC Corporation |
| 英文描述： | ENHANCED SUPER I/O CONTROLLER WITH FAST IR |
| 中文描述： | 增強(qiáng)的超級(jí)I / O控制器，快速紅外線 |
| 文件頁(yè)數(shù)： | 126/194頁(yè) |
| 文件大小： | 546K |
| 代理商： | 37C67X |
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37
DS1
DS0
DRIVE
0
1
0
1
0
1
drive 0
drive 1
drive 2
drive 3
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 19 for
explanations of the various symbols used. Table
20 lists the required parameters and the results
associated with each command that the FDC is
capable of performing.
Table 19 - 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
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).
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