5.1 Physical Interface
5.1.2.2Primitives descriptions
The following table contains the primitive mnemonics and a brief description of each.
Primitive | Name | Description |
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ALIGN | Physical layer control | Upon receipt of an ALIGN, the physical layer |
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| readjusts internal operations as necessary to |
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| perform its functions correctly. |
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CONT | Continue repeating | The CONT primitive allows long strings of |
| previous primitive | repeated primitives to be eliminated. The |
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| CONT primitive implies that the previously |
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| received primitive be repeated as long as |
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| another primitive is not received. |
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EOF | End of frame | EOF marks the end of a frame. |
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PMACK | Power management | Sent in response to a PMREQ_S or |
| acknowledge | PMREQ_P when a receiving node is prepared |
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| to enter a power mode state. |
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HOLD | Hold data transmission | HOLD is transmitted in place of payload data |
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| within a frame when the transmitter does not |
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| have the next payload data ready for |
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| transmission. HOLD is also transmitted on the |
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| backchannel when a receiver is not ready to |
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| receive additional payload data. |
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HOLDA | Hold acknowledge | This primitive is sent by a transmitter as long |
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| the HOLD primitive is received by its |
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| companion receiver. |
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PMNAK | Power management | Sent in response to a PMREQ_S or |
| denial | PMREQ_P when a receiving node is not |
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| prepared to enter a power mode state or when |
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| power management is not supported. |
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|
PMREQ_P | Power management | This primitive is sent continuously until |
| request to partial | PMACK or PMNAK is received. When |
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| PMACK is received, current node (host or |
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| device) will stop PMREQ_P and enters the |
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| Partial power management state. |
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PMREQ_S | Power management | This primitive is sent continuously until |
| request to slumber | PMACK or PMNAK is received. When |
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| PMACK is received, current node (host or |
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| device) will stop PMREQ_S and enters the |
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| Slumber power management state. |
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R_ERR | Reception error | Current node (host or device) detected error in |
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| received payload. |
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