Difference between revisions of "83Plus:Ports:8E"
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(Port 8E: pipe number) |
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[[Category:83Plus:Ports:By Address|8E - USB Pipe Number]] [[Category:83Plus:Ports:By Name|USB Pipe Number]] | [[Category:83Plus:Ports:By Address|8E - USB Pipe Number]] [[Category:83Plus:Ports:By Name|USB Pipe Number]] | ||
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== Synopsis == | == Synopsis == | ||
'''Port Number:''' 8Eh | '''Port Number:''' 8Eh | ||
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This port controls which USB pipe is currently selected for I/O operations. | This port controls which USB pipe is currently selected for I/O operations. | ||
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=== Read Values === | === Read Values === | ||
Revision as of 20:22, 27 October 2011
| This port only exists on the the TI-84 Plus and the TI-84 Plus Silver Edition. On the standard TI-83 Plus, it acts as a shadow of port 06. On the TI-83 Plus Silver Edition, this port has no effect. |
Synopsis
Port Number: 8Eh
Function: USB Pipe Number
This port controls which USB pipe is currently selected for I/O operations.
Read Values
- Always 0.
Write Values
- Pipe number (values 0 to 3 work; I'm not sure about other values.)
Comments
The USB controller supports 4 (or possibly more) separate "pipes", which can be used to perform multiple USB transactions simultaneously. Pipe 0 is always used for control transactions (endpoint zero), and behaves strangely in many ways. The other pipes can be used for bulk, interrupt, and/or isochronous transactions; they are typically mapped to endpoints 1 to 3, but do not necessarily need to be.
This port has no effect on its own; it merely determines which pipe is used by subsequent I/O operations. The following ports are affected by the currently-selected pipe:
