If Scatter/Gather was enabled for the associated control block, then this field con-tains the address of the data pointer in the Scatter/Gather list that was most recentlyused to transfer data.If Scatter/Gather was not enabled for the associated control block, then this field con-tains the address specified in the data pointer field of the control block.Additional Status LengthThis 16-bit field specifies the number of additional bytes of status that is available.This field is valid if the Additional Status Available flag (Status Word, bit 8) is set toone. The value of this field will range from 0 to 18 (decimal) bytes. Byte 14 suppliesthe number of bytes transferred during a Request Sense command. Bytes 15 through23 of the status block are reserved for future use. Bytes 24 through 31 supply infor-mation pertaining to a target mode command (either Receive or Send) received by thehost adapter from another SCSI initiator.If this field is zero, then no additional status is available and the the values in bytes14 through 31 are invalid.Sense LengthThis 8-bit field contains the number of sense information bytes actually transferred.This number can be used to determine which bytes in the Sense Information dataarea are valid.This field is valid only when the Sense Information Stored flag (Status Word, bit 9) isset to one.Target Mode CDBThese six bytes are stored by the host adapter following the completion of a TargetSCSI Command control block. They provide to the host the actual SCSI command de-scriptor block received by the host adapter from another initiator device on the SCSIbus.Byte 26 contains the command opcode (08h = Receive, 0Ah = Send). Bytes 28 through30 contain the number of bytes (most significant byte first) the initiator wanted to betransferred.Control Block CommandsControl block commands utilize a fully multitasking delivery interface. The addressof the control block is stored into the Mailbox Out registers, least significant bytefirst. The Attention register is then stored with the following value:EISA-to-Fast SCSI Host Adapter Enhanced Mode Firmware Description6-19
