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83Plus:Ports:93 - Revision history
2024-03-29T07:14:27Z
Revision history for this page on the wiki
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https://wikiti.brandonw.net/index.php?title=83Plus:Ports:93&diff=9814&oldid=prev
Thepenguin77 at 04:25, 28 October 2011
2011-10-28T04:25:06Z
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<td colspan='2' style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 04:25, 28 October 2011</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Category:83Plus:Ports:By Address|93 - USB Read Packet Size]] [[Category:83Plus:Ports:By Name|USB Read Packet Size]]</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Category:83Plus:Ports:By Address|93 - USB Read Packet Size]] [[Category:83Plus:Ports:By Name|USB Read Packet Size]]</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">{{84P-Only Port|03}}</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Synopsis ==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Synopsis ==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''Port Number:''' 93h</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''Port Number:''' 93h</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>This port controls the maximum packet size allowed for data read from a USB pipe.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>This port controls the maximum packet size allowed for data read from a USB pipe.</div></td></tr>
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<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">{{84P-Only Port|11}}</del></div></td><td colspan="2"> </td></tr>
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Thepenguin77
https://wikiti.brandonw.net/index.php?title=83Plus:Ports:93&diff=9282&oldid=prev
FloppusMaximus: Port 93: maximum packet size for reading
2010-11-15T04:02:37Z
<p>Port 93: maximum packet size for reading</p>
<p><b>New page</b></p><div>[[Category:83Plus:Ports:By Address|93 - USB Read Packet Size]] [[Category:83Plus:Ports:By Name|USB Read Packet Size]]<br />
== Synopsis ==<br />
'''Port Number:''' 93h<br />
<br />
'''Function:''' USB Read Packet Size<br />
<br />
This port controls the maximum packet size allowed for data read from a USB pipe.<br />
<br />
{{84P-Only Port|11}}<br />
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=== Read Values ===<br />
* Unknown<br />
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=== Write Values ===<br />
* Bits 0-7: Maximum packet size for the current pipe, divided by 8.<br />
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== Comments ==<br />
This port tells the USB controller the maximum allowed packet size for data read from the current pipe. (The "current" pipe is determined by [[83Plus:Ports:8E|port 8E]].)<br />
<br />
The value written to this port is the maximum packet size, or the wMaxPacketSize field in the endpoint descriptor, ''divided by 8''. For an endpoint with a wMaxPacketSize that isn't a multiple of 8, you should presumably round up.<br />
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In host mode, it's important to know the maximum packet size for incoming endpoints, so that the USB controller can schedule transactions properly. I'm not sure what effect this port has in peripheral mode. In any case, it seems wise to configure this port, along with [[83Plus:Ports:9A|port 9A]] (bEndpointAddress / bmAttributes), and possibly [[83Plus:Ports:9B|port 9B]] (bInterval), before requesting any data from a pipe.</div>
FloppusMaximus