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21020285 D User’s Guide
Chapter 2 Hardware Essentials
Page 2 - 12 Status Port
Status Port
The Status Port is a read-only port. It contains information regarding the
condition of the board during power-up/reset and during normal board
operation. It is used to report:
• A sequence of self-test codes while a reset is occurring.
• An error code if self-test fails or a catastrophic error occurs during normal
operation.
• Readiness of the board for commands (RDY bit).
• Readiness for a new Single Command (ENT bit).
The Status Port is 16 bits wide. The bit meanings of the port will be different
depending on whether the status is General information or Reset information;
each has separate formats. Both types of format are described in this section.
Status Port:
Reset Format
The RF3880 adapter performs a series of self-tests on reset or power-up. The
Status Port is used by the RF3880 adapter to indicate the progress of the self-
test as it is occurring. At power-up or reset, the Status Port will have this format:
Upon power-up or reset the following sequence will occur:
1. Soon after reset, the Status Port is written with a value of FDH.
2. Next, self-test begins and as it progresses, the Self-test Code fields are
updated with the code of the test currently executing.
3. The RDY bit is zero during self-test to indicate the board cannot accept
any command. All other fields of the Port (except Self-test Code (STC)
fields) also remain zero as long as self-test continues.
4. The RDY bit will change to one if the self-tests complete successfully.
The self-tests takes five seconds. If, after this time, the RDY bit is still
zero, a self-test has failed.
If a self-test fails, the RDY bit will remain zero and the code of the test
that failed will remain in the Self-test Code fields of the Status Port.
5. After the RF3880 self-tests complete successfully, and the RDY bit is
set to one, the Status Port format will change to the General format.
BIT
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 Self-test Code (STC) RDY STC
Table 9: Status Port: Reset