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| 英文描述： | AMD Test Interface Port Board Schematics? 149KB (PDF) |
| 中文描述： | AMD測試接口端口板原理圖？ 149KB（PDF格式） |
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Test Interface Port Board User’s Manual
2-22
Discrete Inputs Register
The following are the 8-bit and 16-bit addresses for the Discrete Inputs register:
Address: 8-bit = 303h, 16-bit = 306h
The Discrete Inputs register returns the state of the eight general-purpose inputs
on the TIP board, as shown in Table 2-10. These inputs appear on the INPUT side
of connector P7. The value of each bit indicates the current state of its associated
input.
When a bit reads 1, the input is currently active (turned on/set to 5 V at the
output).
When a bit reads 0, the input is currently inactive (turned off/set to 0 V at the
output).
Writing to this register has no effect on the state or operation of the TIP board.
Table 2-10. Discrete Inputs Register Bit Definitions
Bit
Pin
Description
0
15
The most significant (left most) output
1
13
The next most significant output
2
11
The next most significant output
3
9
The next most significant output
4
7
The next most significant output
5
5
The next most significant output
6
3
The next most significant output
7
1
The least significant (right most) output
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