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What are the specifications for bit 2 in Basic Status Register of SMI?

Latest Updated:09/28/2009

Question:

To check link status, I am reading bit 2 (Link Status) in Basic Status Register (Register #1) of the SMI registers. But the bit appears to not show the correct link status. What are the specifications for this bit?

Answer:

The bit 2 (Link Status) latches that the Link Down happens. So the bit is always "0" after Link Down happens. So if you do not read the bit (Link Status) in the Link-Down state before moving to the Link-Up state, the bit 2 (Link Status) keeps "0". In the case, when the bit 2 is read, the bit 2 go to "1".
Note: In the case that the bit 2 (Link Status) is read in the Link Down status, the bit 2 will be "1" at Link Up.
Suitable Products
SH7619