Cheetah 10K.6 FC Product Manual, Rev. B | 55 |
9.5.3Electrical description
Fibre Channel drives use the
•DC power
•
•Drive select (device identification)
•Option selection
•Enclosure Services interface
This
9.5.4Pin descriptions
This section provides a
Table 20: |
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Pin |
| Signal name | Signal type |
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1* |
| Low Voltage | |
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| TTL output |
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2* |
| 12 Volts |
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3* |
| 12 Volts |
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4* |
| 12 Volts |
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5* |
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6* |
| Ground[1] |
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7* |
| Active LED out | Open collector out |
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8* |
| Reserved |
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9* |
| Start_1 [2] | TTL input |
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10* |
| Start_2 [2] | TTL input |
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11* |
| Low Voltage | |
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| TTL output |
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12* |
| SEL_6 | TTL input/output |
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13* |
| SEL_5 | TTL input/output |
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14* |
| SEL_4 | TTL input |
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15* |
| SEL_3 | TTL input/output |
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16* |
| Fault LED out | Open collector out |
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17* |
| DEV_CTRL_CODE_2 | TTL input |
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| [2] |
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18* |
| DEV_CTRL_CODE_1 | TTL input |
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| [2] |
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19* |
| 5 Volts |
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20* |
| 5 Volts |
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Pin | Signal name | Signal type |
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21 | 12 Volts charge |
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22 | Ground |
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23 | Ground |
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24* | +Port A_in | Diff. PECL input pair |
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25* |
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26 | Ground |
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27* | +Port B_in | Diff. PECL input pair |
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28* |
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29 | Ground |
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30* | +Port A_out | Diff PECL output pair |
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31* |
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32 | Ground |
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33* | +Port B_out | Diff PECL output pair |
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34* |
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35 | Ground |
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36 | SEL_2 | TTL input/output |
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37 | SEL_1 | TTL input/output |
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38 | SEL_0 | TTL input/output |
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39 | DEV_CTRL_CODE_0 [2] | TTL input |
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40 | 5 Volts charge |
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*Short pins in mating backpanel connector.
[1]This pin may be connected to external logic to detect the presence of the drive. The drive connects this pin to the common ground.
[2]Pins 9, 10, 17, 18, and 39 are option select pins and are tied high by the drive circuitry. The preferred elec- trical connection at the backplane is either open or grounded (open for the ‘1’ setting, grounded for the ‘0’ setting). Alternatively, these pins may be driven by a 3.3V logic device, pulled up to 3.3V through a