Fast transfer feature of the EZ-USB AN2135SC - FRD#, FWR# lines not toggling
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Dec 19, 2008
12:00 AM
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Dec 19, 2008
12:00 AM
Question: The FRD# and FWR# lines are not toggling on the AN2135SC if the absolute address is 0xF000 or 0x8051 (outside the on-chip RAM space). The PORTACFG bits, FRD# and FWR# line signals, and data lines D0-D7 are correctly set.Is this a documentation problem or does the FRD# and FWR# lines not work on devices without the external address bus?
Answer:
The fast transfer mechanism provides access to on-chip memory space only.
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