- 您现在的位置：买卖IC网 > PDF目录156551 > 37C67X (SMSC Corporation) ENHANCED SUPER I/O CONTROLLER WITH FAST IR PDF资料下载
参数资料
| 型号： | 37C67X |
| 厂商： | SMSC Corporation |
| 英文描述： | ENHANCED SUPER I/O CONTROLLER WITH FAST IR |
| 中文描述： | 增强的超级I / O控制器，快速红外线 |
| 文件页数： | 20/194页 |
| 文件大小： | 546K |
| 代理商： | 37C67X |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页当前第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页第105页第106页第107页第108页第109页第110页第111页第112页第113页第114页第115页第116页第117页第118页第119页第120页第121页第122页第123页第124页第125页第126页第127页第128页第129页第130页第131页第132页第133页第134页第135页第136页第137页第138页第139页第140页第141页第142页第143页第144页第145页第146页第147页第148页第149页第150页第151页第152页第153页第154页第155页第156页第157页第158页第159页第160页第161页第162页第163页第164页第165页第166页第167页第168页第169页第170页第171页第172页第173页第174页第175页第176页第177页第178页第179页第180页第181页第182页第183页第184页第185页第186页第187页第188页第189页第190页第191页第192页第193页第194页
116
IRQSER Cycle Control
There are two modes of operation for the
IRQSER Start Frame.
1) Quiet (Active) Mode : Any device may
initiate a Start Frame by driving the IRQSER low
for one clock, while the IRQSER is Idle. After
driving low for one clock the IRQSER must
immediately be tri-stated without at any time
driving high. A Start Frame may not be initiated
while the IRQSER is Active.
The IRQSER is
Idle between Stop and Start Frames.
The
IRQSER is Active between Start and Stop
Frames. This mode of operation allows the
IRQSER to be Idle when there are no IRQ/Data
transitions which should be most of the time.
Once a Start Frame has been initiated the Host
Controller will take over driving the IRQSER low
in the next clock and will continue driving the
IRQSER low for a programmable period of three
to seven clocks. This makes a total low pulse
width of four to eight clocks. Finally, the Host
Controller will drive the IRQSER back high for
one clock, then tri-state.
Any IRQSER Device (i.e., The FDC37C67x)
which detects any transition on an IRQ/Data line
for which it is responsible must initiate a Start
Frame in order to update the Host Controller
unless the IRQSER is already in an IRQSER
Cycle and the IRQ/Data transition can be
delivered in that IRQSER Cycle.
2) Continuous (Idle) Mode: Only the Host
controller can initiate a Start Frame to update
IRQ/Data line information.
All other IRQSER
agents become passive and may not initiate a
Start Frame. IRQSER will be driven low for four
to eight clocks by Host Controller. This mode
has two functions. It can be used to stop or idle
the IRQSER or the Host Controller can operate
IRQSER in a continuous mode by initiating a
Start Frame at the end of every Stop Frame.
An IRQSER mode transition can only occur
during the Stop Frame. Upon reset, IRQSER
bus
is
defaulted
to
Continuous
mode,
therefore only the Host controller can initiate
the
first
Start
Frame.
Slaves
must
continuously sample the Stop Frames pulse
width to determine the next IRQSER Cycle’s
mode.
IRQSER Data Frame
Once a Start Frame has been initiated, the
FDC37C67x will watch for the rising edge of the
Start Pulse and start counting IRQ/Data Frames
from there.
Each IRQ/Data Frame is three
clocks: Sample phase, Recovery phase, and
Turn-around phase. During the Sample phase
the FDC37C67x must drive the IRQSER (SIRQ
pin) low, if and only if, its last detected IRQ/Data
value was low. If its detected IRQ/Data value is
high, IRQSER must be left tri-stated. During the
Recovery phase the FDC37C67x must drive the
SERIRQ high, if and only if, it had driven the
IRQSER low during the previous Sample Phase.
During the Turn-around Phase the FDC37C67x
must tri-state the SERIRQ. The FDC37C67x will
drive the IRQSER line low at the appropriate
sample point if its associated IRQ/Data line is
low, regardless of which device initiated the
Start Frame.
The Sample Phase for each IRQ/Data follows
the low to high transition of the Start Frame
pulse by a number of clocks equal to the
IRQ/Data Frame times three, minus one. (e.g.
The IRQ5 Sample clock is the sixth IRQ/Data
Frame, (6 x 3) - 1 = 17th clock after the rising
edge of the Start Pulse).
相关PDF资料 |
PDF描述 |
|---|---|
| 37C957FR | ULTRA I/O CONTROLLER FOR PORTABLE APPLICATIONS |
| 37FMA1-ABW31N | SPECIAL SWITCH-PIEZO SWITCH, SPST, MOMENTARY, 0.2A, 24VDC, PANEL MOUNT-THREADED |
| 37FML1-BEW31N | SPECIAL SWITCH-PIEZO SWITCH, SPST, MOMENTARY, 0.2A, 24VDC, PANEL MOUNT-THREADED |
| 37FML2-ACW21N | SPECIAL SWITCH-PIEZO SWITCH, SPST, MOMENTARY, 1A, 24VDC, PANEL MOUNT-THREADED |
| 37FMA1-AAW11N | SPECIAL SWITCH-PIEZO SWITCH, SPST, MOMENTARY, 0.2A, 24VDC, PANEL MOUNT-THREADED |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 37C-6BH-5-5 | 制造商:Birtcher Products 功能描述: |
| 37C72U-185 | 制造商:White-Rodgers 功能描述: |
| 37C73U-170 | 制造商:White-Rodgers 功能描述: |
| 37C73U-171 | 制造商:White-Rodgers 功能描述: |
| 37C922BQFP | 制造商:SMSC 功能描述: |
发布紧急采购，3分钟左右您将得到回复。