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參數(shù)資料
| 型號(hào)： | LPC47B34X |
| 廠商： | STANDARD MICROSYSTEMS CORP |
| 元件分類(lèi)： | 外設(shè)及接口 |
| 英文描述： | 128 Pin Enhanced Super I/O with LPC Interface for Consumer Applications |
| 中文描述： | MULTIFUNCTION PERIPHERAL, PQFP128 |
| 封裝： | QFP-128 |
| 文件頁(yè)數(shù)： | 45/250頁(yè) |
| 文件大?。?/td> | 645K |
| 代理商： | LPC47B34X |
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45
Result Phase
The generation of the interrupt determines the beginning of the result phase. For each of the
commands, a defined set of result bytes has to be read from the FDC before the result phase is
complete. These bytes of data must be read out for another command to start.
RQM and DIO must both equal "1" before the result bytes may be read. After all the result bytes have
been read, the RQM and DIO bits switch to "1" and "0" respectively, and the CB bit is cleared,
indicating that the FDC is ready to accept the next command.
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 16 for explanations of the various symbols used. Table 17 lists the required parameters and the
results associated with each command that the FDC is capable of performing.
Table 15 – Description of Command Symbols
NAME
Cylinder Address
The currently selected address; 0 to 255.
Data Pattern
The pattern to be written in each sector data field during
formatting.
Drive Select 0-1
Designates which drives are perpendicular drives on the
Perpendicular Mode Command. A "1" indicates a perpendicular
drive.
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.
Disk Drive Select
DS1 DS0 DRIVE
0 0 Drive 0
0 1 Drive 1
Special Sector
Size
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.
Enable Count
When this bit is "1" the "DTL" parameter of the Verify command
becomes SC (number of sectors per track).
Enable FIFO
This active low bit when a 0, enables the FIFO. A "1" disables the
FIFO (default).
Enable Implied
Seek
read or write command that requires the C parameter in the
command phase. A "0" disables the implied seek.
End of Track
The final sector number of the current track.
Alters Gap 2 length when using Perpendicular Mode.
SYMBOL
C
D
DESCRIPTION
D0, D1
DIR
DS0, DS1
DTL
By setting N to zero (00), DTL may be used to control the number
EC
EFIFO
EIS
When set, a seek operation will be performed before executing any
EOT
GAP
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