Chapter 4 Command Operation
Page 4 - 12 |
| Some Example Single Commands |
Some Example
Single
Commands
Example 1:
Start
Command List
Board-control
command
The following examples will help you understand how to use the Single Command structure. Two examples are given here. The first is an example of a
The Start Command List
This example shows you how to use the Single Command Structure to initiate the Command List.
1.Select a portion of system memory for the Single Command structure. You will need
Example Memory Address = 822F4H
2.Fill in the Parameter Block information. (Detailed Parameter Block information for each
These are the Parameter Block values for this example:
Address |
|
| Byte Memory Address |
| |||
Offset | Offset + 0 |
| Offset + 1 |
| Offset + 2 |
| Offset + 3 |
|
|
|
|
|
| ||
00H |
| Command Identifier = 000822F4H |
| ||||
04H | Reserved |
|
| Addr Mod = 3DH |
| ID = FFH | |
|
|
|
|
| |||
08H | Command List Memory Address = 00099450H |
| |||||
|
|
|
|
|
| ||
0CH | Reserved |
|
| Interrupt = 0300H | |||
|
|
|
|
|
|
| |
10H | Command = 10H |
|
|
| Reserved |
| |
|
|
|
|
|
|
|
|
14H |
|
|
| Reserved |
| ||
|
|
|
|
|
| ||
18H |
|
|
| Reserved |
| ||
Table 22: Example Start Command List PB
Command Identifier = 822F4H
Even though the Status Block is part of the Single Command structure and easily identified it is good to provide a value here in order to be consistent with Command List structures. The value chosen is the address of the Single Command structure.
Address Modifier = 3DH
This value indicates that Standard Supervisory Data Access will be used for Command List data transfers.
ID = FFH
Indicates to the RF3880 adapter that this is a Board- control command.
Command List Memory Address = 99450H
21020285 D | User’s Guide |
