Chapter 2 Hardware Essentials
Page 2 - 14 |
| Status Port |
Status Port:
General
Format
Note
This bit does not toggle for Command List Channel Attentions.
After the RF3880
BIT
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
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| Code |
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| 0 |
| ERR | 0 | 0 | RDY | ENT | |
Table 11: Status Port: General
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.
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.
21020285 D | User’s Guide |
