2 digital waveform different phase

Hi.

I need to generate 2 digital waveforms. each waveform is 1 bit.

the 2 waveforms need be shift by 90 degree (like in AB encoder output).

I managed to do it by using signal generation and then converte it to digital waveform.

In order to create in this way two digital waveform shifted i need to use X4 time sampling rate to enable the conversion save the phase.

I would like to generate directly 2 digital waveform 1 bit each with 90 degree phase.

is it possible?

Thanks.