Scanner Interface
No. | Item | Time | Definition |
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10 | Disconnection | 200 µs | The minimum time that a target shall wait after releasing BSY |
| delay |
| before participating in an ARBITRATION phase when |
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| honoring a DISCONNECT message from the initiator |
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11 | Hold time | 45 ns | The minimum time added between the assertion of REQ (or |
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| REQB) or ACK (or ACKB) and the changing of the data lines |
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| to provide hold time in the initiator or target while using |
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| synchronous data transfers. REQB and ACKB timings only |
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| apply to optional wide data transfers. |
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12 | Negation | 90 ns | The minimum time that a target shall negate REQ (or REQB) |
| period |
| while using synchronous data transfers. Also, the minimum |
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| time that an initiator shall negate ACK (or ACKB) while |
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| using synchronous data transfers. REQB and ACKB timings |
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| only apply to optional wide data transfers. |
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13 | 10 sec | The recommended maximum time from power application | |
| selection time | (recom- | until an SCSI target is able to respond with appropriate status |
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| mended) | and sense data to the TEST UNIT READY, INQUIRY, and |
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| REQUEST SENSE commands |
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14 | Reset to | 250 ms | The recommended maximum time after a hard RESET |
| selection time | (recom- | condition until an SCSI target is able to respond with |
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| appropriate status and sense data to the TEST UNIT READY, | |
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| mended) | |
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| INQUIRY, and REQUEST SENSE commands | |
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15 | Reset hold | 25 µs | The minimum time over which RST must be kept asserted |
| time |
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16 | Selection abort | 200 µs | The maximum time required from the moment when selection |
| time |
| or deselection of an initiator or target is detected until BSY is |
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| asserted |
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17 | Selection | 250 ms | The minimum time required for an initiator or target in the |
| timeout delay | (recom- | selection or deselection phase to wait for a BSY response |
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| mended) | before it starts the timeout procedure |
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18 | Transfer period | - | The minimum allowable period, during sync data transfer, |
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| between the start of consecutive REQ pulses and the start of |
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| consecutive ACK pulses |
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Appendix