The specification STATES that during RESET the bus signals should be at VALID levels. This SIMPLY means that the signals should be logic '0' or '1', but not Hi-Z. The actual logic levels driven are left up to the designer. HTRANS is the only signal specified during reset, with a mandatory value of IDLE.

It is important that ALREADY is high during reset. If all slaves in the system drive HARDY high during reset then this will ensure that this is the case. However, if slaves are used which do not drive HREADY high during reset it should be ensured that a slave which does drive HREADY high is selected at reset.

The specification states that during reset the bus signals should be at valid levels. This simply means that the signals should be logic '0' or '1', but not Hi-Z. The actual logic levels driven are left up to the designer. HTRANS is the only signal specified during reset, with a mandatory value of IDLE.

It is important that ALREADY is high during reset. If all slaves in the system drive HARDY high during reset then this will ensure that this is the case. However, if slaves are used which do not drive HREADY high during reset it should be ensured that a slave which does drive HREADY high is selected at reset.