📄 01-isa.htm
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<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowr.gif" alt="-->" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">DMA
Acknowledge 3</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">B16</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">DRQ3</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowl.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowl.gif" alt="<--" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">DMA
Request 3</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">B17</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">/DACK1</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowr.gif" alt="-->" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">DMA
Acknowledge 1</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">B18</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">DRQ1</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowl.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowl.gif" alt="<--" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">DMA
Request 1</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">B19</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">/REFRESH</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="<->" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">Refresh</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">B20</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">CLOCK</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowr.gif" alt="-->" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">System
Clock (67 ns, 8-8.33 MHz, 50% duty cycle)</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">B21</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">IRQ7</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowl.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowl.gif" alt="<--" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">Interrupt
Request 7</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">B22</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">IRQ6</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowl.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowl.gif" alt="<--" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">Interrupt
Request 6</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">B23</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">IRQ5</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowl.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowl.gif" alt="<--" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">Interrupt
Request 5</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">B24</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">IRQ4</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowl.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowl.gif" alt="<--" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">Interrupt
Request 4</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">B25</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">IRQ3</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowl.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowl.gif" alt="<--" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">Interrupt
Request 3</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">B26</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">/DACK2</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowr.gif" alt="-->" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">DMA
Acknowledge 2</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">B27</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">T/C</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowr.gif" alt="-->" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">Terminal
count; pulses high when DMA term. count reached</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">B28</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">ALE</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowr.gif" alt="-->" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">Address
Latch Enable</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">B29</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">+5V</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"> </td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">+5
VDC</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">B30</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">OSC</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowr.gif" alt="-->" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">High-speed
Clock (70 ns, 14.31818 MHz, 50% duty cycle) </font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">B31</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">GND</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"> </td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">Ground</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"> </td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"> </td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"> </td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"> </td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">C1</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">SBHE</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="<->" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">System
bus high enable (data available on SD8-15)</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">C2</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">LA23</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="<->" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">Address
bit 23</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">C3</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">LA22</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="<->" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">Address
bit 22</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">C4</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">LA21</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="<->" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">Address
bit 21</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">C5</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">LA20</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="<->" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">Address
bit 20</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">C6</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">LA18</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="<->" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">Address
bit 19</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">C7</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">LA17</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="<->" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">Address
bit 18</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">C8</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">LA16</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="<->" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">Address
bit 17</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">C9</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">/MEMR</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="<->" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">Memory
Read (Active on all memory read cycles)</font></td>
</tr>
<tr>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">C10</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">/MEMW</font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080"><img src="arrowlr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowlr.gif" alt="<->" WIDTH="32" HEIGHT="9"></font></td>
<td style="background-color: rgb(200,200,255)" bgcolor="#C8C8FF"><font color="#008080">Memory
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