Extended Message support
Name | Code | Support |
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Synchronous Data | 01h | The drive can initiate a Synchronous data transfer negotiation. If the |
Transfer Request |
| message is received after selection and before the command phase, it |
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| will then go to |
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| complete the negotiation. |
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Wide Data Transfer | 03h | The drive can initiate a Wide data transfer negotiation. If the message |
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| is received after selection and before the command phase, it will then |
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| go to |
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| the negotiation. |
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| Note that SDTR negotiated parameters will become asynchronous after |
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| a WDTR. |
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Parallel Protocol | 04h | The drive will never initiate a Parallel Protocol Request transfer |
Request |
| negotiation but will expect the initiator to do so. |
If the message is received after selection and before the command phase, it will then go to
Synchronous Data Transfer Request
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
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0 |
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| Extended Message (01h) |
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1 |
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| Extended Message Length (03h) |
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2 |
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| SDTR (01h) |
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3 |
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| Transfer Period Factor |
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4 |
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| Req/Ack Offset |
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Wide Data Transfer Request
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| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Messages |
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| 0 |
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| Extended Message (01h) |
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| 1 |
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| Extended Message Length (02h) |
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| 2 |
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| WDTR (01h) |
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| 3 |
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| Transfer Width Exponent |
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25