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| 型號(hào)： | 22505 |
| 英文描述： | AMD Test Interface Port Board User＇s Manual? 2.62MB (PDF) |
| 中文描述： | AMD測(cè)試接口端口板用戶手冊(cè)？ 2.62MB（PDF格式） |
| 文件頁(yè)數(shù)： | 45/78頁(yè) |
| 文件大小： | 2691K |
| 代理商： | 22505 |
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Test Interface Port Board User’s Manual
2-21
General-Purpose Inputs and Outputs
The TIP board provides eight discrete inputs and eight discrete outputs through a
standard 20-pin header, and eight discrete inputs through a DIP switch (illustrated
in Figure 2-9). These are TTL/CMOS signals.
Figure 2-9. General-Purpose Input/Output Header
The inputs are general-purpose and allow the software to only read the input buffer.
Therefore, these inputs do not support a read-modify-write style of operation. For
information about reading the input buffer, see “Discrete Inputs Register” on
page 2-22.
The outputs can be directly connected to a logic analyzer by a straight-through
ribbon cable. These outputs support the tracing of software operation,
not
hardware.
For example, to measure the interrupt latency of an interrupt and the interrupt
handler execution time, simply toggle a bit on entry to and exit from the interrupt
service routine (ISR). You can measure this with an in-circuit emulator (ICE), but
it can be difficult to set up.
However, using the TIP board, you can measure the above operation by adding
simple instructions to the ISR and using a logic analyzer. Software can write to
and read from the output buffer thereby supporting a read-modify-write operation.
For information about reading or writing the output buffer, see “Discrete Outputs
Register” on page 2-23.
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