5.11.1LOG SENSE Command Descriptor Block
The Command Descriptor Block for the LOG SENSE command is shown in Table
Table
Bit | 7 |
| 6 | 5 |
| 4 |
| 3 |
| 2 | 1 | 0 | |
Byte |
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| 0 |
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| Operation Code (4Dh) |
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| 1 |
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| Reserved |
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| PPC | SP | |
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| 2 |
| PC |
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| Page Code |
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3 | – 4 |
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5 | – 6 |
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| Parameter Pointer |
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7 | – 8 |
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| Allocation Length |
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| 9 |
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| Control |
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Table
Field | Description | |
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PPC | The Parameter Pointer Control bit controls the type of parameters that can be requested | |
from the drive. This bit must be 0, indicating that all log parameters for the specified page | ||
| (subject to the allocation length specified) are returned to the initiator. | |
SP | The Save Pages bit specifies whether the parameters are to be saved. This bit must be 0, | |
indicating that no parameters are to be saved and are reset at | ||
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| RESET. | |
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PC | The Page Control field defines the type of parameter values to be selected. The field must | |
be 01b indicating that the current values are to be returned. Mode 11b (return default val- | ||
| ues) is not supported because all counters have a default value of 0. | |
Page Code | The value specified as the Page Code determines the page to be returned. Table | |
tains a list of supported log pages and their page codes. | ||
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Parameter Pointer | This field is related to the PPC field. This bit must be 0. | |
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Allocation Length | This specifies the number of bytes of data that the drive is allowed to pass during the | |
DATA IN phase. The requested page is truncated if its length exceeds the number of bytes | ||
| specified in this field. |
Maxtor Atlas 10K V |