The Margin Control subpage (see Table
A MODE SELECT command will return the current settings for the initiator/target pair. Fields that are not implemented will be reported as zero.
Table
Bit | 7 | 6 | 5 | 4 |
| 3 | 2 |
| 1 |
| 0 |
Byte |
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0 |
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| Reserved |
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1 |
| Driver Strength |
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| Reserved |
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2 |
| Drive’s Asymmetry |
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| Driver Precompensation |
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3 |
| Drive’s Slew Rate |
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4 |
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5 |
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| Reserved |
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6 |
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| Reserved |
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7 |
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| Vendor Specific |
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8 |
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9 |
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10 |
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11 |
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12 |
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13 |
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14 |
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15 |
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| Reserved |
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| Table |
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Field | Description |
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Driver | The DRIVER STRENGTH field indicates the relative amount of driver source cur- |
Strength | rently used by the driver. The Driver Strength field affects both the strong and week |
| drivers. A larger value indicates more driver source current. |
Driver Pre- | The DRIVER PRECOMPENSATION field indicates the relative difference between |
compensation | the weak driver and the strong driver amplitudes when precompensation is enabled. |
| A larger value indicates a larger difference between the weak and strong amplitudes. |
Driver | The Driver Asymmetry field indicates the relative difference between the amplitudes |
Asymmetry | of asserted and negated signals launched from the driver. A larger value indicates a |
| relatively stronger asserted signal compared to the negated signal. |
Driver Slew | The DRIVER SLEW RATE field indicates the relative difference between the asser- |
rate | tion and negation magnitudes divided by the rise or fall time. A larger value indicates |
| a faster slew rate. |