Ciprico Rimfire 3880 User Manual download pdf (Page 63)

User’s Guide 21020285 D

Chapter 4 Command Operation

The Base Parameter Block Page 4 - 5

Command Options, Addresses, and Transfer Count

You will use these fields of the Parameter Block to supply an address and

transfer count when a data transfer is required by the command you wish to

issue. There are also some command-modifying options available to you

depending on the command you are issuing.

Target/Adapter ID - The Target/Adapter ID byte is very important to the

command issue process. The value you supply here determines whether the

command described in the Command Descriptor Block is a Pass-through

command or an adapter Board-control command:

• If the ID = FFH, the command is a Board-control command.

• If the ID = 0-FH (0-15), the command is destined for the SCSI target or

initiator with that ID.

Command Descriptor Block

In this part of the Parameter Block you must supply details about the command

to be executed. The Command Descriptor Block will contain a SCSI command,

a Target Mode response, or an adapter Board- control command. The RF3880

Board-control commands are explained in detail in Chapter 7. You can find

more information about issuing Pass-through commands later in this chapter

and in Chapters 5 and 6. For detail about actual SCSI commands, see a SCSI

specification or your vendor-supplied peripheral documentation.

Command Code - This field will always contain a command code for either

a Pass-through or an adapter Board-control command.

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Ciprico Rimfire 3880 User Manual Page 63