Fujitsu MJA2500BH Maintenance Manual - Page 79

5.1 Physical Interface 5.1.2.2 Primitives descriptions The following table contains the primitive mnemonics and a brief description of each. Primitive ALIGN CONT EOF PMACK HOLD HOLDA PMNAK PMREQ_P Name Physical layer control Continue repeating previous primitive End of frame Power management acknowledge Hold data transmission Hold acknowledge Power management denial Power management request to partial Description Upon receipt of an ALIGN, the physical layer readjusts internal operations as necessary to perform its functions correctly. The CONT primitive allows long strings of repeated primitives to be eliminated. The CONT primitive implies that the previously received primitive be repeated as long as another primitive is not received. EOF marks the end of a frame. Sent in response to a PMREQ_S or PMREQ_P when a receiving node is prepared to enter a power mode state. HOLD is transmitted in place of payload data within a frame when the transmitter does not have the next payload data ready for transmission. HOLD is also transmitted on the backchannel when a receiver is not ready to receive additional payload data. This primitive is sent by a transmitter as long the HOLD primitive is received by its companion receiver. Sent in response to a PMREQ_S or PMREQ_P when a receiving node is not prepared to enter a power mode state or when power management is not supported. This primitive is sent continuously until PMACK or PMNAK is received. When PMACK is received, current node (host or device) will stop PMREQ_P and enters the Partial power management state. PMREQ_S Power management request to slumber R_ERR Reception error This primitive is sent continuously until PMACK or PMNAK is received. When PMACK is received, current node (host or device) will stop PMREQ_S and enters the Slumber power management state. Current node (host or device) detected error in received payload. C141-E293 5-5