參數(shù)資料
型號： 37B77X
廠商： SMSC Corporation
英文描述： ENHANCED SUPER I/O CONTROLLER WITH WAKE UP FEATURES
中文描述： 增強型超I / O與向上特征喚醒控制器
文件頁數(shù)： 195/196頁
文件大?。?/td> 573K
代理商： 37B77X
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頁當前第195頁第196頁
98
OPERATION
Mode Switching/Software Control
Software will execute P1284 negotiation and all
operation prior to a data transfer phase under
programmed I/O control (mode 000 or 001).
Hardware provides an automatic control line
handshake, moving data between the FIFO and
the ECP port only in the data transfer phase
(modes 011 or 010).
Setting the mode to 011 or 010 will cause the
hardware to initiate data transfer.
If the port is in mode 000 or 001 it may switch to
any other mode. If the port is not in mode 000
or 001 it can only be switched into mode 000 or
001.
The direction can only be changed in
mode 001.
Once in an extended forward mode the software
should wait for the FIFO to be empty before
switching back to mode 000 or 001. In this case
all control signals will be deasserted before the
mode switch. In an ecp reverse mode the
software waits for all the data to be read from
the FIFO before changing back to mode 000 or
001.
Since the automatic hardware
ecp
reverse handshake only cares about the state of
the FIFO it may have acquired extra data which
will be discarded. It may in fact be in the middle
of a transfer when the mode is changed back to
000 or 001. In this case the port will deassert
nAutoFd independent of the state of the transfer.
The design shall not cause glitches on the
handshake signals if the software meets the
constraints above.
ECP Operation
Prior to ECP operation the Host must negotiate
on the parallel port to determine if the peripheral
supports
the
ECP protocol. This is a
somewhat
complex
negotiation
carried
out
under program control in mode 000.
After negotiation, it is necessary to initialize
some of the port bits. The following are required:
Set Direction = 0, enabling the drivers.
Set strobe = 0, causing the nStrobe signal
to default to the deasserted state.
Set
autoFd
= 0, causing the nAutoFd
signal to default to the deasserted state.
Set mode = 011 (ECP Mode)
ECP address/RLE bytes or data bytes may be
sent automatically by writing the ecpAFifo or
ecpDFifo respectively.
Note that all FIFO data transfers are byte wide
and byte aligned.
Address/RLE transfers are
byte-wide and only allowed in the forward
direction.
The host may switch directions by first switching
to mode = 001, negotiating for the forward or
reverse channel, setting direction to 1 or 0, then
setting mode = 011. When direction is 1 the
hardware shall handshake for each ECP read
data byte and attempt to fill the FIFO.
Bytes
may then be read from the ecpDFifo as long as
it is not empty.
ECP transfers may also be accomplished (albeit
slowly) by handshaking individual bytes under
program control in mode = 001, or 000.
Termination from ECP Mode
Termination from ECP Mode is similar to the
termination from Nibble/Byte Modes. The host is
permitted to terminate from ECP Mode only in
specific well-defined states. The termination can
only be executed while the bus is in the forward
direction. To terminate while the channel is in
the reverse direction, it must first be transitioned
into the forward direction.
相關(guān)PDF資料
PDF描述
37C669 DIODE SCHOTTKY SINGLE 25V 200mW 0.5V-vf 200mA-IFM 30mA-IF 2uA-IR SOD-323 3K/REEL
37C672 ENHANCED SUPER I/O CONTROLLER WITH FAST IR
37C67X ENHANCED SUPER I/O CONTROLLER WITH FAST IR
37C957FR ULTRA I/O CONTROLLER FOR PORTABLE APPLICATIONS
37FMA1-ABW31N SPECIAL SWITCH-PIEZO SWITCH, SPST, MOMENTARY, 0.2A, 24VDC, PANEL MOUNT-THREADED
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
37B999 制造商:TE Connectivity 功能描述:
37BCB34-4 制造商: 功能描述: 制造商:undefined 功能描述:
37BK 功能描述:烙鐵 Weller Modular Heatr Thread-on Tips 50W RoHS:否 制造商:Weller 產(chǎn)品:Soldering Stations 類型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大溫度:+ 850 F 電纜類型:US Cord Included
37BMA-SMA-50-1 制造商:HUBER+SUHNER 功能描述:BETWEEN SERIES ADAPTER
37BNC-50-0-1/3E 制造商:HUBER+SUHNER 功能描述:BETWEEN SERIES ADAPTER
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*