请问SPI与SSI接口的差别

Meon

望各位大侠给点解释

ghfirst

<P><FONT size=2>同步串行接口 <FONT color=#cc0033>SSI</FONT> </FONT></P><P><FONT size=2>串行外围接口 SPI</FONT></P>

pan

<P>SSI 同步串行接口synchronous serial interface</P>
<P>SPI 串行并联接口Serial Parallel Interface</P>

都是串行通讯的同步方式
感觉差不多，但spi有CS而SSI没有

[此贴子已经被作者于2006-4-20 18:08:21编辑过]

[br]<p align=right><font color=red>+3 RD币</font></p>

wayoqi

<P><b>SPI features (Motolora design)</b></P><UL><LI>full duplex, four-wrie synchronous transfers <LI>programmable clock polarity and phase <LI>4-16bits </LI></UL><P><b>Synchronous serial interface features(SSI)(Texas Instrumnets )</b></P><UL><LI>full-duplex, four-wire synchronous transfer <LI>transmit data pin trstateable when not transmitting <LI>4-16bit</LI></UL><P>     For SPI  frame formats, the serial frame (SSPESSOUT) pin is active LOW, and is asserted (plled down) during the entire transmission of the frame.</P><P>    For SSI. SSPESSOUT pin is pulsed for one serial clokc period starting at its rising edge, prior to the transmission of each trame. For this frame format, both the SSP and the off-chip slave drive their ouput data on the rising edge of SSPCLKOUT, and latch data from the other device on the falling edge.</P>[br]<p align=right><font color=red>+3 RD币</font></p>

applewn

<DIV class=quote><B>以下是引用<I>pan</I>在2006-4-20 17:32:00的发言：</B>

<P>SSI 同步串行接口synchronous serial interface</P>
<P>SPI 串行并联接口Serial Parallel Interface[/COLOR]
错了吧，有又串行又并行的IF吗
</P>

都是串行通讯的同步方式
感觉差不多，但spi有CS而SSI没有


<P align=right><FONT color=red>+3 RD币</FONT></P></DIV>