General Hardware Design
3.5.1Signal Interface MII
Table 8. | MII NPE A Signal Recommendations | |||||
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| Input/ | Pull |
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| Name |
| Up | Recommendations | |
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| Output | |||
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| Down |
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| Transmit Clock. |
| ETHA_TXCLK |
| I | Yes | When this interface/signal is enabled and is not being used in a system design, the | |
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| interface/signal should be pulled high with a |
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| ETHA_TXDATA[3:0] | O | No | Transmit Data. | ||
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| ETHA_TXEN |
| O | No | Transmit Enable. | |
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| Receive Clock. |
| ETHA_RXCLK |
| I | Yes | When this interface/signal is enabled and is not being used in a system design, the | |
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| interface/signal should be pulled high with a |
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| Receive Data. |
| ETHA_RXDATA[3:0] | I | Yes | When this interface/signal is enabled and is not being used in a system design, the | ||
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| interface/signal should be pulled high with a |
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| Receive Data Valid. |
| ETHA_RXDV |
| I | Yes | When this interface/signal is enabled and is not being used in a system design, the | |
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| interface/signal should be pulled high with a |
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| Collision Detect. |
| ETHA_COL |
| I | Yes | If operating in a full duplex mode and there is no requirement to use the Collision | |
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| Detect signal, then the pin must be pulled low with a |
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| Carrier Sense. |
| ETHA_CRS |
| I | Yes | When this interface/signal is enabled and is not being used in a system design, the | |
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| interface/signal should be pulled high with a |
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| Notes: |
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| 1. | Features disabled/enabled by Soft Fuse must be done during the | ||||
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| being disabled without asserting a system reset. | ||||
| 2. | Features disabled by a specific part number, do not require | ||||
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| unconnected. |
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| 3. | Features enabled by a specific part number — and required to be Soft | ||||
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Table 9. | MII NPE B Signal Recommendations (Sheet 1 of 2) | ||||
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| Input/ | Pull |
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| Name |
| Up/ | Recommendations | |
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| Output | |||
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| Down |
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| Transmit Clock. |
| ETHB_TXCLK |
| I | Yes | When this interface/signal is enabled and is not being used in a system design, the |
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| interface/signal should be pulled high with a |
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| ETHB_TXDATA[3:0] | O | No | Transmit Data. | |
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| ETHB_TXEN |
| O | No | Transmit Enable. |
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| Receive Clock. |
| ETHB_RXCLK |
| I | Yes | When this interface/signal is enabled and is not being used in a system design, the |
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| interface/signal should be pulled high with a |
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| Receive Data. |
| ETHB_RXDATA[3:0] | I | Yes | When this interface/signal is enabled and is not being used in a system design, the | |
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| interface/signal should be pulled high with a |
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| Receive Data Valid. |
| ETHB_RXDV |
| I | Yes | When this interface/signal is enabled and is not being used in a system design, the |
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| interface/signal should be pulled high with a |
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| Intel® IXP45X and Intel® IXP46X Product Line of Network Processors |
February 2007 | HDD |
Document Number: 305261; Revision: 004 | 31 |