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參數(shù)資料
| 型號： | IQX320-10PP391I |
| 英文描述： | User Programmable Special Function ASIC |
| 中文描述： | 用戶可編程ASIC的特殊功能 |
| 文件頁數(shù)： | 13/65頁 |
| 文件大小： | 620K |
| 代理商： | IQX320-10PP391I |
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IQX Family Data Sheet
June 2000
Revision 5.0
13
Bus Repeater
- In the Bus Repeater mode, the I/O Port behaves as a wire (with a non-zero
propagation delay). This unique feature patented by I-Cube incorporates a self-sensing circuit
to determne signal direction and does not require a direction control signal.
When multiple I/O Ports, configured as “Bus Repeater”, are connected together through the
Switch Matrix to forma single internal node, an (open collector or tristatable) external signal
appearing at any one of the I/O Ports gets repeated (or broadcast) to other I/O Ports.
The Bus Repeater mode requires a pull-up current source (see section on “Programmable
Pull-Up Current”) to operate properly. For more details, refer to the Technical Note: “The Bus
Repeater Mode.”
BR
Array Side Force 0
- In this input mode, the Switch Matrix line is forced low (logic 0),
regardless of the signal on the corresponding I/O Port. In this mode an optional input enable
(IE) can be selected. Either polarity can be selected for IE. The default level is a logic 1.
A0
Array Side Force 1
- In this input mode, the Switch Matrix line is forced high (logic 1),
regardless of the signal on the corresponding I/O Port. In this mode an optional input enable
(IE) can be selected. Either polarity can be selected for IE. The default level is a logic 1.
A1
Pin Side Force 0
- In this output mode, the I/O Port pin is forced low (logic 0), regardless of
the signal on the corresponding Switch Matrix line. In this mode an optional output enable (OE)
can be selected. Either polarity can be selected for OE. The default level is a logic 0.
F0
Pin Side Force 1
- In this output mode, the I/O Port pin is forced high (logic 1), regardless of
the signal on the corresponding Switch Matrix line. In this mode an optional output enable (OE)
can be selected. Either polarity can be selected for OE. The default level is a logic 0.
F1
No Connect
- In this mode, the I/O Port pin is isolated fromthe Switch Matrix. This is done by
tristating both the input and output part of the I/O buffer.
NC
Symbol
I/O Port Function
Mnemonic
Table 1. Summary of Programmable I/O Attributes for IQX Devices (Continued)
Px
Ax
Px
Ax
Px
Ax
Px
Ax
Px
Ax
Px
Ax
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