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21020285 D User’s Guide
Chapter 2 Hardware Essentials
Page 2 - 14 Status Port
Status Port:
General
Format
After the RF3880 self-tests have completed successfully and the RDY bit is set
to one, the Status port is used to return general board information. The Status
Port will have the following format:
The meanings of the Status Port fields are as follows during normal operation:
ENT Entered - This bit is used to signal when a new Single Command may
be issued to the adapter via a Channel Attention. The board is ready for another
Single Command write to the Channel Attention Port each time this bit value
toggles. It does not indicate that a command has completed, only that a new
Single Command may be initiated.
Note
This bit does not toggle
for Command List
Channel Attentions.
Initially this bit ⇒ 0
After 1st Single Command Channel
Attention ⇒ 1;
After 2nd Single Command Channel
Attention ⇒ 0; etc.
RDY Ready - This bit indicates when the adapter is ready to accept commands
after a reset has completed. During normal operation it should always be set to
one.
0 ⇒ No command can be accepted.
1 ⇒ Ready to accept a command.
ERR Error - This bit is used to signal that a catastrophic error occurred that
could not be reported through the command interface. (Example: Using an
invalid Parameter Block address which resulted in a VMEbus error. Typically
the AMBER LED will also light if this bit is set.)
0 ⇒ Normal operation.
1 ⇒ Error condition.
BIT
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Code 0 ERR 0 0 RDY ENT
Table 11: Status Port: General