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如果我外部用64K flash.64k SRAM.和几个外部芯片.<br />那么我可否这样来连接:<br /><br />FLASH的连接:<br /><br />FLASH TMS320VC5402<br />A0..A15 <==>A0..A15<br />D0..D15 <==>D0..D15<br />/OE <==> NOT (RW) OR PS<br />/WE <==>(RW) OR PS<br />/CE <==>MEMSTRB OR PS<br /><br />SRAM 的连接<br />A0..A15 <==>A0..A15<br />D0..D15 <==>D0..D15<br />/OE <==> NOT (RW) OR DS<br />/WE <==> RW OR DS<br />/CS <==> MEMSTRB OR DS<br /><br />IO:4个外部IC<br />A3,A2,A1,A0<br />1, 1, 1, 0<br />1, 1, 0, 1<br />1, 0, 1, 1<br />0, 1, 1, 1<br /><br />U1WR <==> RW OR IOS;<br />U1RD <==> NOT (RW) OR IOS;<br />CS1=A0(低电平有效)<br />访问地址:0xXXXe<br /><br /><br />U2WR <==> RW OR IOS;<br />U2RD <==> NOT (RW) OR IOS;<br />CS2=A1<br />访问地址:0xXXXd<br /><br />U3WR <==> RW OR IOS;<br />U3RD <==> NOT (RW) OR IOS;<br />CS3=A2<br />访问地址:0xXXXB<br /><br />U4WR <==> RW OR IOS;<br />U4RD <==> NOT (RW) OR IOS;<br />CS4=A3<br />访问地址:0xXXX7<br />上面用到了或门<br /><br />看到很多都用CPLD来做译码..或门速度不够吗?<br />我这样做可行吗????<br /><br /><br /> |
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