- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄358934 > LPC47M14M-NC (SMSC Corporation) CAT5 MULTI 1X9 VIDEO DISTRIBUTION AMP PDF資料下載
參數(shù)資料
| 型號(hào)： | LPC47M14M-NC |
| 廠商： | SMSC Corporation |
| 英文描述： | CAT5 MULTI 1X9 VIDEO DISTRIBUTION AMP |
| 中文描述： | 128引腳ENGANCED超級(jí)I / O與LPC接口和USB集線器控制器 |
| 文件頁數(shù)： | 56/205頁 |
| 文件大小： | 1219K |
| 代理商： | LPC47M14M-NC |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁當(dāng)前第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁第169頁第170頁第171頁第172頁第173頁第174頁第175頁第176頁第177頁第178頁第179頁第180頁第181頁第182頁第183頁第184頁第185頁第186頁第187頁第188頁第189頁第190頁第191頁第192頁第193頁第194頁第195頁第196頁第197頁第198頁第199頁第200頁第201頁第202頁第203頁第204頁第205頁
SMSC DS – LPC47M14X
Page 56
Rev. 05/02/2000
Seek
The read/write head within the drive is moved from track to track under the control of the Seek command. The FDC
compares the PCN, which is the current head position, with the NCN and performs the following operation if there is a
difference:
PCN < NCN: Direction signal to drive set to "1" (step in) and issues step pulses.
PCN > NCN: Direction signal to drive set to "0" (step out) and issues step pulses.
The rate at which step pulses are issued is controlled by SRT (Stepping Rate Time) in the Specify command. After each
step pulse is issued, NCN is compared against PCN, and when NCN = PCN the SE bit in Status Register 0 is set to "1"
and the command is terminated. During the command phase of the seek or recalibrate operation, the FDC is in the
BUSY state, but during the execution phase it is in the NON-BUSY state. At this time, another Seek or Recalibrate
command may be issued, and in this manner, parallel seek operations may be done on up to four drives at once.
Note that if implied seek is not enabled, the read and write commands should be preceded by:
1) Seek command - Step to the proper track
2) Sense Interrupt Status command - Terminate the Seek command
3) Read ID - Verify head is on proper track
4) Issue Read/Write command.
The Seek command does not have a result phase. Therefore, it is highly recommended that the Sense Interrupt Status
command is issued after the Seek command to terminate it and to provide verification of the head position (PCN). The
H bit (Head Address) in ST0 will always return to a "0". When exiting POWERDOWN mode, the FDC clears the PCN
value and the status information to zero. Prior to issuing the POWERDOWN command, it is highly recommended that
the user service all pending interrupts through the Sense Interrupt Status command.
Sense Interrupt Status
An interrupt signal is generated by the FDC for one of the following reasons:
1) Upon entering the Result Phase of:
a.
Read Data command
b.
Read A Track command
c.
Read ID command
d.
Read Deleted Data command
e.
Write Data command
f.
Format A Track command
g.
Write Deleted Data command
h.
Verify command
2) End of Seek, Relative Seek, or Recalibrate command
The Sense Interrupt Status command resets the interrupt signal and, via the IC code and SE bit of Status Register 0,
identifies the cause of the interrupt.
Table 26 – Interrupt Identification
SE
IC
INTERRUPT DUE TO
0
1
1
11
00
01
Polling
Normal termination of Seek
or Recalibrate command
Abnormal termination of
Seek or Recalibrate
command
The Seek, Relative Seek, and Recalibrate commands have no result phase. The Sense Interrupt Status command must
be issued immediately after these commands to terminate them and to provide verification of the head position (PCN).
The H (Head Address) bit in ST0 will always return a "0". If a Sense Interrupt Status is not issued, the drive will continue
to be BUSY and may affect the operation of the next command.
Sense Drive Status
Sense Drive Status obtains drive status information. It has not execution phase and goes directly to the result phase
from the command phase. Status Register 3 contains the drive status information.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LPC47M14Q-NC | HD VIEW RECEIVER 2 PORT DAISYCHAINABLE |
| LPC47M14V-NC | AT PRINTER SERIAL CBL DB9 FEMALE - DB25 MALE |
| LPC47M14R-NC | 128 PIN ENGANCED SUPER I/O CONTROLLER WITH AN LPC INTERFACE AND USB HUB |
| LPC47M14I-NC | 128 PIN ENGANCED SUPER I/O CONTROLLER WITH AN LPC INTERFACE AND USB HUB |
| LPC47M14K-NC | RESTR 1.50K 1 TOL 1/8W MF |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LPC47M14N-NC | 制造商:SMSC 制造商全稱:SMSC 功能描述:128 PIN ENGANCED SUPER I/O CONTROLLER WITH AN LPC INTERFACE AND USB HUB |
| LPC47M14O-NC | 制造商:SMSC 制造商全稱:SMSC 功能描述:128 PIN ENGANCED SUPER I/O CONTROLLER WITH AN LPC INTERFACE AND USB HUB |
| LPC47M14P-NC | 制造商:SMSC 制造商全稱:SMSC 功能描述:128 PIN ENGANCED SUPER I/O CONTROLLER WITH AN LPC INTERFACE AND USB HUB |
| LPC47M14Q-NC | 制造商:SMSC 制造商全稱:SMSC 功能描述:128 PIN ENGANCED SUPER I/O CONTROLLER WITH AN LPC INTERFACE AND USB HUB |
| LPC47M14R-NC | 制造商:SMSC 制造商全稱:SMSC 功能描述:128 PIN ENGANCED SUPER I/O CONTROLLER WITH AN LPC INTERFACE AND USB HUB |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。