--- nand.py-
+++ nand.py
@@ -143,6 +143,24 @@
 		self.nand_b.out.conn = self.nand_o.inp_b
 		self.nand_o.out.conn = Pin(self, 'out')
 
+class RSFF(Obj):
+	def __init__(self, parent, name='rsff', latency=10):
+		Obj.__init__(self, parent, name)
+		NAND(self, 'nand_r', latency)
+		NAND(self, 'nand_s', latency)
+		Joint(self, 'jt_r')
+		Joint(self, 'jt_s')
+
+		Pin(self, 'R', 'H').conn = self.nand_r.inp_a
+		self.nand_r.out.conn = self.jt_r.new_pin()
+		self.jt_r.new_pin().conn = Pin(self, 'Q')
+		self.jt_r.new_pin().conn = self.nand_s.inp_a
+
+		Pin(self, 'S', 'L').conn = self.nand_s.inp_b
+		self.nand_s.out.conn = self.jt_s.new_pin()
+		self.jt_s.new_pin().conn = Pin(self, 'nQ')
+		self.jt_s.new_pin().conn = self.nand_r.inp_b
+
 class CLK(Obj):
 	def __init__(self, parent, hz=1.0, name='clk'):
 		Obj.__init__(self, parent, name)