PMAC2A PC104 Hardware Reference Manual
E4: CPU Frequency Select
| E Point and | Location | Description |
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| Physical Layout |
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| E4 | C4 | Remove jumper for 40 MHz operation (E2 |
| No jumper installed | ||
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| OFF also) or for 60 MHz operation (E4 ON). |
| (standard or Option 5EF) | |||
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| Jump pin 1 to 2 for 80 MHz operation (E2 |
| Jumper installed (Option | ||
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| OFF). |
| 5CF) | ||
| E8: Phase Clock Lines Output Enable |
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| E Point and | Location | Description |
| Default | ||
| Physical Layout |
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| B1 | Jump pin 1 to 2 to enable the PHASE clock |
| No Jumper | ||
| E8 |
| line on the J8 connector, allowing |
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| synchronization with another PMAC. |
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| Remove jumper to disable the PHASE clock |
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| line on the J8 connector. |
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| E9: Servo Clock Lines Output Enable |
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| E Point and | Location | Description |
| Default | ||
| Physical Layout |
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| Jump pin 1 to 2 to enable the SERVO clock |
| No Jumper | ||
| E9 |
| line on the J8 connector, allowing |
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| B1 | synchronization with another PMAC. |
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| Remove jumper to disable the SERVO clock |
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| line on the J8 connector. |
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| E10 – E12: |
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| E Point and | Location | Description |
| Default | ||
| Physical Layout |
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| E10 | E5 | Remove jumper E10; |
| No E10 jumper installed; | ||
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| Jump E11; |
| Jump E11 and E12 | ||
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| Jump E12; |
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| To read flash IC on |
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| Other combinations are for factory use only; |
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| the board will not operate in any other |
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| configuration. |
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| E12 |
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42 | Base Board |