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<title>CMSIS-DAP: DAP_TransferBlock</title>
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 <span id="projectnumber">Version 2.0.0</span>
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<div id="projectbrief">Interface Firmware for CoreSight Debug Access Port</div>
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<div class="title">DAP_TransferBlock<div class="ingroups"><a class="el" href="group__DAP__transfer__gr.html">Transfer Commands</a></div></div> </div>
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<p>Read/Write a block of data from/to a single register.
<a href="#details">More...</a></p>
<p>Read/Write a block of data from/to a single register. </p>
<p>The <b>DAP_TransferBlock Command</b> read or write a data block to the same CoreSight register. A data block are multiple 32-bit values which are read or written from/to the same CoreSight register. The CoreSight register is addressed with DPBANKSEL/APBANKSEL and address lines A2, A3 (A0 = 0 and A1 = 0). The command can execute several read/write operations to a single DP/AP register.</p>
<p>The data transfer is aborted on a communication error:</p>
<ul>
<li>Protocol Error</li>
<li>Target FAULT response</li>
<li>Target WAIT responses exceed configured value</li>
</ul>
<p><b>DAP_TransferBlock Command</b>: </p>
<div class="fragment"><div class="line">| BYTE | BYTE *****| SHORT**********| BYTE *************| WORD *********|</div>
<div class="line">> 0x06 | DAP Index | Transfer Count | Transfer Request | Transfer Data |</div>
<div class="line">|******|***********|****************|*******************|+++++++++++++++|</div>
</div><!-- fragment --><ul>
<li><b>DAP Index</b>: Zero based device index of the selected JTAG device. For SWD mode the value is ignored.</li>
<li><b>Transfer Count</b>: Number of transfers: 1 .. 65535.</li>
<li><b>Transfer Request</b>: Contains information about requested access from host<ul>
<li>Bit 0: APnDP: 0 = DP (Debug Port), 1 = AP (Access Port)</li>
<li>Bit 1: RnW: 0 = Write Register, 1 = Read Register</li>
<li>Bit 2: A2 := Register Address bit 2</li>
<li>Bit 3: A3 := Register Address bit 3</li>
</ul>
</li>
<li><b>Transfer Data</b>: register values<ul>
<li>for Write Register transfer request: the register values written to the CoreSight register.</li>
<li>no data is sent for Read Register operations.</li>
</ul>
</li>
</ul>
<p><b>DAP_TransferBlock Response</b>: </p>
<div class="fragment"><div class="line">| BYTE | SHORT *********| BYTE *************| WORD *********|</div>
<div class="line">< 0x06 | Transfer Count | Transfer Response | Transfer Data |</div>
<div class="line">|******|****************|*******************|+++++++++++++++|</div>
</div><!-- fragment --><ul>
<li><b>DAP Index</b>: Zero based device index of the selected JTAG device. For SWD mode the value is ignored.</li>
<li><b>Transfer Count</b>: Number of transfers (1 .. 65535) that are executed.</li>
<li><b>Transfer Response</b>: Contains information about last response from target<ul>
<li>Bit 2..0: ACK (Acknowledge) value:<ul>
<li>1 = OK (for SWD protocol), OK or FAULT (for JTAG protocol),</li>
<li>2 = WAIT</li>
<li>4 = FAULT</li>
<li>7 = NO_ACK (no response from target)</li>
</ul>
</li>
<li>Bit 3: Protocol Error (SWD)</li>
</ul>
</li>
<li><b>Transfer Data</b>: register values<ul>
<li>no data is receive for Write Register operations.</li>
<li>for Read Register transfer request: the register values read from CoreSight register. </li>
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