yosys/techlibs/nanoxplore/rf_rams_u.txt

# Register-File  RAMs for NanoXplore NG-ULTRA

# Dual-port RAMs.
# NX_RFB_U in mode 0 (DPREG)
# NX_RFB_U in mode 2 (NX_XRFB_64x18)
# NX_RFB_U in mode 3 (NX_XRFB_32x36)

ram distributed $__NX_RFB_U_DPREG_ {
	option "MODE" 0 {
        cost 30;
        widthscale 30;
		abits 5;
		widths 18 global;
	}
	option "MODE" 2 {
        cost 50;
        widthscale 30;
		abits 6;
		widths 18 global;
	}
	option "MODE" 3 {
        cost 50;
        widthscale 30;
		abits 5;
		widths 36 global;
	}
    init no_undef;

    port sw "W" {
        clock anyedge;
    }
    port ar "R" {
    }
}

# Single-port RAMs.
# NX_RFB_U in mode 1 (SPREG)

ram distributed $__NX_RFB_U_SPREG_ {
	cost 30;
    widthscale;
    abits 5;
    width 18;
	init no_undef;
	port arsw "RW" {
		clock anyedge;
	}
}

# Single write dual read RAMs.
# NX_RFB_U in mode 4 (NX_XRFB_2R_1W)

ram distributed $__NX_XRFB_2R_1W_ {
	cost 40;
    widthscale 30;
    abits 5;
    width 18;
	init no_undef;
    port sw "W" {
        clock anyedge;
    }
    port ar "A" {
    }
    port ar "B" {
    }
}