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User’s Guide 21020285 D
Chapter 2 Hardware Essentials
Descriptions of Port Usage Page 2 - 17
Descriptions of
Port Usage
The following describes port usage. Assume that the adapter address jumpers
are set to a base address of EE00H.
Issuing a Reset — Write to Reset Port at address EE18H. The RF3880 will
begin executing self-test. Read the Status Port at address EE10H to find when
self-test completes.
Issuing a Single Command — Write three words to the Address Buffer
Port at address EE00H. These words select system bus width/swapping options
as well as the Address Modifier and memory address of the Single Command.
To begin command execution, issue a Single Command Channel Attention by
writing a 0 to Channel Attention Port at address EE08H. Read Status Port at
EE10H to check for Enter condition before issuing the next command.
Issuing a Command List — Once an active Command List has been
established, write a 1 to the Channel Attention Port (address EE08H) for a
Command List Channel Attention after the new commands are added to the list
Acknowledging Target Mode Selection — Write a 2 to the Channel
Attention port (address EE08H) to indicate that target data has been read by
Host.
Read Board Command Status — Read the Status Port at address EE10H
to find the current status of the adapter.