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To convert a NAND gate latch to a clocked S/R flip-flop, two NAND gates may be used as above left to enable an input pulse on either the S or R lines to trigger a transition. In order to add clock synchronization to a flip-flop, a ciruit is used to apply the clock pulses to the flip-flop. This gives it the toggle action when J and K are both high. In the case of the J-K flip-flop, the pulse steering circuit is tied to the output lines past the NAND gate latch. HyperPhysics***** Electricity and magnetism Therefore all transitions are synchronized to the clock. Likewise, a clock pulse must have the reset NAND gate high to receive a high RESET pulse. When the signal line S goes high, the other line to the NAND gate from the pulse steering circuit must also be high for it to generate a low output. Clocked Set-reset Flip-flop Clocked Set-Reset Flip-flop Example Output