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AT91SAM 系列微控制器的NAND Flash支持代码 描述怎样将NAND Flash和AT91SAM 系列微控制器连接起来。

<a name="PDC"></a><null><table border=1 cellpadding=0 cellspacing=0 width="100%"><null><th bgcolor="#FFFFCC"><font size="-1"><b>Offset</b></font></th><th bgcolor="#FFFFCC"><font size="-1"><b>Field</b></font></th><th bgcolor="#FFFFCC"><font size="-1"><b>Description</b></font></th>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x0</b></font></td><td><font size="-1"><a href="AT91SAM9260_PDC.html#PDC_RPR">PDC_RPR</a></font></td><td><font size="-1">Receive Pointer Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x4</b></font></td><td><font size="-1"><a href="AT91SAM9260_PDC.html#PDC_RCR">PDC_RCR</a></font></td><td><font size="-1">Receive Counter Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x8</b></font></td><td><font size="-1"><a href="AT91SAM9260_PDC.html#PDC_TPR">PDC_TPR</a></font></td><td><font size="-1">Transmit Pointer Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0xC</b></font></td><td><font size="-1"><a href="AT91SAM9260_PDC.html#PDC_TCR">PDC_TCR</a></font></td><td><font size="-1">Transmit Counter Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x10</b></font></td><td><font size="-1"><a href="AT91SAM9260_PDC.html#PDC_RNPR">PDC_RNPR</a></font></td><td><font size="-1">Receive Next Pointer Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x14</b></font></td><td><font size="-1"><a href="AT91SAM9260_PDC.html#PDC_RNCR">PDC_RNCR</a></font></td><td><font size="-1">Receive Next Counter Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x18</b></font></td><td><font size="-1"><a href="AT91SAM9260_PDC.html#PDC_TNPR">PDC_TNPR</a></font></td><td><font size="-1">Transmit Next Pointer Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x1C</b></font></td><td><font size="-1"><a href="AT91SAM9260_PDC.html#PDC_TNCR">PDC_TNCR</a></font></td><td><font size="-1">Transmit Next Counter Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x20</b></font></td><td><font size="-1"><a href="AT91SAM9260_PDC.html#PDC_PTCR">PDC_PTCR</a></font></td><td><font size="-1">PDC Transfer Control Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x24</b></font></td><td><font size="-1"><a href="AT91SAM9260_PDC.html#PDC_PTSR">PDC_PTSR</a></font></td><td><font size="-1">PDC Transfer Status Register</font></td></tr>
</null></table><br><table border=1 cellpadding=0 cellspacing=0 width="100%"><null><th bgcolor="#FFFFCC"><font size="-1"><b>Function</b></font></th><th bgcolor="#FFFFCC"><font size="-1"><b>Description</b></font></th><tr><td bgcolor="#FFFFCC"><font size="-1"><b><a href="lib_AT91SAM9260_h.html#AT91F_PDC_SetRx">AT91F_PDC_SetRx</a></b></font></td><td><font size="-1">Set the receive transfer descriptor</font></td></tr>
<tr><td bgcolor="#FFFFCC"><font size="-1"><b><a href="lib_AT91SAM9260_h.html#AT91F_PDC_EnableRx">AT91F_PDC_EnableRx</a></b></font></td><td><font size="-1">Enable receive</font></td></tr>
<tr><td bgcolor="#FFFFCC"><font size="-1"><b><a href="lib_AT91SAM9260_h.html#AT91F_PDC_ReceiveFrame">AT91F_PDC_ReceiveFrame</a></b></font></td><td><font size="-1">Close PDC: disable TX and RX reset transfer descriptors</font></td></tr>
<tr><td bgcolor="#FFFFCC"><font size="-1"><b><a href="lib_AT91SAM9260_h.html#AT91F_PDC_SetTx">AT91F_PDC_SetTx</a></b></font></td><td><font size="-1">Set the transmit transfer descriptor</font></td></tr>
<tr><td bgcolor="#FFFFCC"><font size="-1"><b><a href="lib_AT91SAM9260_h.html#AT91F_PDC_DisableRx">AT91F_PDC_DisableRx</a></b></font></td><td><font size="-1">Disable receive</font></td></tr>
<tr><td bgcolor="#FFFFCC"><font size="-1"><b><a href="lib_AT91SAM9260_h.html#AT91F_PDC_EnableTx">AT91F_PDC_EnableTx</a></b></font></td><td><font size="-1">Enable transmit</font></td></tr>
<tr><td bgcolor="#FFFFCC"><font size="-1"><b><a href="lib_AT91SAM9260_h.html#AT91F_PDC_IsNextRxEmpty">AT91F_PDC_IsNextRxEmpty</a></b></font></td><td><font size="-1">Test if the next transfer descriptor has been moved to the current td</font></td></tr>
<tr><td bgcolor="#FFFFCC"><font size="-1"><b><a href="lib_AT91SAM9260_h.html#AT91F_PDC_DisableTx">AT91F_PDC_DisableTx</a></b></font></td><td><font size="-1">Disable transmit</font></td></tr>