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LPC47M14B-NC 参数 Datasheet PDF下载

LPC47M14B-NC图片预览
型号: LPC47M14B-NC
PDF下载: 下载PDF文件 查看货源
内容描述: 128 PIN ENGANCED超级I / O与LPC接口和USB集线器控制器 [128 PIN ENGANCED SUPER I/O CONTROLLER WITH AN LPC INTERFACE AND USB HUB]
分类和应用: 控制器PC
文件页数/大小: 205 页 / 1208 K
品牌: SMSC [ SMSC CORPORATION ]
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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 17 for explanations of the various symbols used. Table 18 lists the  
required parameters and the results associated with each command that the FDC is capable of performing.  
Table 17 – Description of Command Symbols  
SYMBOL  
NAME  
DESCRIPTION  
C
D
Cylinder Address The currently selected address; 0 to 255.  
Data Pattern  
The pattern to be written in each sector data field during formatting.  
D0, D1  
Drive Select 0-1 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  
Drive 0  
Drive 1  
0
0
0
1
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  
EFIFO  
EIS  
Enable Count  
Enable FIFO  
When this bit is "1" the "DTL" parameter of the Verify command  
becomes SC (number of sectors per track).  
This active low bit when a 0, enables the FIFO. A "1" disables the  
FIFO (default).  
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.  
Enable Implied  
Seek  
EOT  
GAP  
GPL  
End of Track  
The final sector number of the current track.  
Alters Gap 2 length when using Perpendicular Mode.  
Gap Length  
The Gap 3 size. (Gap 3 is the space between sectors excluding the  
VCO synchronization field).  
H/HDS  
HLT  
Head Address  
Selected head: 0 or 1 (disk side 0 or 1) as encoded in the sector ID  
field.  
Head Load Time The time interval that FDC waits after loading the head and before  
initializing a read or write operation. Refer to the Specify command  
for actual delays.  
HUT  
Head Unload  
The time interval from the end of the execution phase (of a read or  
write command) until the head is unloaded. Refer to the Specify  
command for actual delays.  
Time  
LOCK  
Lock defines whether EFIFO, FIFOTHR, and PRETRK parameters of  
the CONFIGURE COMMAND can be reset to their default values by  
a "software Reset". (A reset caused by writing to the appropriate bits  
of either the DSR or DOR)  
MFM  
MFM/FM Mode  
Selector  
A one selects the double density (MFM) mode. A zero selects single  
density (FM) mode.  
SMSC DS – LPC47M14X  
Page 41  
Rev. 03/19/2001  
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