--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/venus/src/usb/usb_domain_bctl.v	Sat Nov 20 19:44:59 2021 +0000
@@ -0,0 +1,27 @@
+/*
+ * This module encapsulates the USB domain circuit for boot control.
+ */
+
+module usb_domain_bctl (GND, P_3V3, ChanB_RTS, ChanB_DTR, CTL1_out, CTL2_out);
+
+input GND, P_3V3;
+input ChanB_RTS, ChanB_DTR;
+output CTL1_out, CTL2_out;
+
+/* pull-up resistors on FT2232D outputs */
+
+resistor ChanB_RTS_pullup (ChanB_RTS, P_3V3);
+resistor ChanB_DTR_pullup (ChanB_DTR, P_3V3);
+
+/* open drain buffers */
+
+logic_ic_common od_buf_common ( .Vcc(P_3V3),
+				.GND(GND)
+	);
+
+capacitor od_buf_bypass_cap (P_3V3, GND);
+
+buffer_slot_basic buf_CTL1 (.A(ChanB_RTS), .Y(CTL1_out));
+buffer_slot_basic buf_CTL2 (.A(ChanB_DTR), .Y(CTL2_out));
+
+endmodule