The statement in the Gowin documentation that in the reading mode
"READ_MODE=0" the output register is not used and the OCE signal is
ignored is not confirmed by practice - if the OCE was left unconnected
or connected to the constant network, then a change in output data was
observed even with CE=0, as well as the absence of such at CE=1.
Synchronizing CE and OCE helps and the memory works properly in complex
systems such as RISC-V emulation and i8080 emulation (with 32K RAM and
16K BSRAM based ROM), but there is no theoretical basis for this fix, so
it is a hack.
Signed-off-by: YRabbit <rabbit@yrabbit.cyou>
eb099a9244