📄 ecp mode.htm
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<TH align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=2>Offset</FONT></TH>
<TH align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=2>Name</FONT></TH>
<TH align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=2>Read/Write</FONT></TH>
<TH><FONT face="Arial, Helvetica, sans-serif" color=#000000
size=2>ECP Mode</FONT></TH>
<TH align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=2>Function</FONT></TH></TR>
<TR>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>000</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>Data</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>R/W</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>000-001</FONT></TD>
<TD><FONT face="Arial, Helvetica, sans-serif" color=#000000
size=1>Data Register</FONT></TD></TR>
<TR>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>000</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>ecpAfifo</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>R/W</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>011</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>ECP Address FIFO</FONT></TD></TR>
<TR>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>001</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>dsr</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>R/W</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>all</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>Status Register</FONT></TD></TR>
<TR>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>002</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>dcr</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>R/W</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>all</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>Control Register</FONT></TD></TR>
<TR>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>400</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>cFifo</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>R/W</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>010</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>Parallel Port Data FIFO</FONT></TD></TR>
<TR>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>400</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>ecpDfifo</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>R/W</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>011</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>ECP Data FIFO</FONT></TD></TR>
<TR>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>400</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>tfifo</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>R/W</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>110</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>Test FIFO</FONT></TD></TR>
<TR>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>400</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>cnfgA</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>R</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>111</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>Configuration Register A</FONT></TD></TR>
<TR>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>401</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>cnfgB</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>R/W</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>111</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>Configuration Register B</FONT></TD></TR>
<TR>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>402</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>ecr</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>R/W</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>all</FONT></TD>
<TD align=middle><FONT face="Arial, Helvetica, sans-serif"
color=#000000 size=1>Extended Control
Register</FONT></TD></TR></TBODY></TABLE><BR></DIV>
<P align=left><FONT face="Arial, Helvetica, sans-serif" color=#000000
size=1>This paper will not attempt to describe all the functions of the
ECP registers. For information regarding the register usage and bit
definitions, please refer to the Microsoft document or the I/O controller
data sheet. </FONT></P>
<P align=left><FONT face="Arial, Helvetica, sans-serif" color=#000000
size=1>It should be noted that if the port is in either standard parallel
port mode or bi- directional mode, then the first 3 registers behave
exactly as a standard parallel port. This way, compatibility with older
devices and device drivers is maintained. </FONT></P>
<P align=left><FONT face="Arial, Helvetica, sans-serif" color=#000000
size=1>Usage of this port is similar to that of the EPP port. An
operational mode is written to the ecr register, and then data transfer is
accomplished by writing or reading from the appropriate I/O port. All of
the handshaking is automatically generated by the interface controller.
The major difference is that the ECP port is meant to be driven by DMA
rather than explicit I/O operations. Again, this is a loosely coupled
interface that is targeted primarily at peripherals that interchange large
blocks of data.</FONT></P>
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