IBM IC35L036UWDY10 Hard Drive Specifications - Page 199

10.1.4 PARALLEL PROTOCOL REQUEST (01,06,04H) Parallel Protocol Request messages are used to negotiate a synchronous data transfer agreement and a wide data transfer agreement and to set the protocol options between two SCSI devices. Bit Byte 7 6 5 4 3 2 1 0 0 Extended message = 01h 1 Extended message length = 06h 2 Parallel Protocol Request = 04h 3 Transfer period factor 4 Reserved = 00h 5 REQ/ACK Offset 6 Transfer Width Exponent 7 PCOMP_EN RTI RTI RD_STRM WR_FLOW HOLD_MCS QAS_REQ DT_REQ IU_REQ Figure 186. Parallel Protocol Request. PARALLEL PROTOCOL REQUEST messages are used to negotiate a synchronous data transfer agreement and a wide data transfer agreement and to set the protocol options between the initiator and the drive. Transfer Period Factor selects the transfer period and determines the timing values for the transfer rate. When both DT_REQ and IU_REQ are set to one, the following values are used. For the values larger than 9 is received from the initiator when both DT_REQ and IU_REQ are set to one, the drive responds with these bits set to zero. Initiator Request Target Response Target Transfer Period (ns) Transfer Rate 0