Ciprico Rimfire 3880 manual D User’s Guide

Chapter 4 Command Operation

Page 4 - 14 Some Example Single Commands

5.The example board is jumpered at address EE00H. The three writes to the Address Buffer Port at address EE00H will be as follows:

1.) 843DH

2.) 0008H

3.) 22F4H

6.Read the Hardware Status Port at address EE10H. Since the ENT bit of the Status Port toggles between 0 and 1 with each Single Command Channel Attention issue, the value returned could be 0202H or 0203H depending on the previous value. We’ll assume this is the first command after a reset; the initial value of the ENT bit is 0. The adapter is ready if the Status Port reads 0202H.

7.To execute the command, write a 0 to the Channel Attention Port.

8.Poll for command completion by reading the Flags Byte of the Status Block and comparing it to zero. When the value is non-zero, the command is complete. The value of the Flags byte in the Status Block will indicate if the command completed with an error. In this example, the command was successful; a value of 80H is returned as shown below. A returned value of C0H would indicate an error had occurred.

Figure 15 Single Command Structure in memory

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