PACKET RETURN STATUS
3
Packet Return Status
When packets are returned to the user, they contain two status words: one with an offset of $02 and the other with an offset of $18, as shown in the tables below, respectively. The first table details the status codes contained in the word at offset $02. Refer to the Interface Rules for the SCSI Firmware section in Chapter 5 for additional information. Also, refer to the command table returned fields.
Status word offset $02
1508 0700
Control Flags
Status Code (Refer to Table
Bits
Bit 13 (RTE FLAG) (of interest only to the programmer)
1 = This return was not preceded by an interrupt and is the first return since command entry. In this case, no RTE is required.
0 = This return was preceded by an interrupt
and is not the first return, therefore, an RTE is required to continue proces- sing from where an interrupt occurred. Register A3 has a pointer to a register save area
Bit 14 (ADDITIONAL STATUS) 1 = External status is valid.
0 = External status is not valid.
