| 摘要 |
<p>An improved latch capable of operation in an edge-triggered, data-handling mode and in an LSSD clocked mode. The latch receives non-overlapping clock pulse trains A, B, C and comprises a first polarity hold latch connected to a second polarity hold latch (L2). The first latch is gated by pulse trains A and C and the second latch by pulse train B. In addition the - C clock input of the improved latch is tied to the + B clock via an OR invert gate. Thus, during the loading of the (L1) latch and data transferred to the (L2) latch, the loading and transfer of false data is eliminated, while the latch otherwise conforms to LSSD rules and can be tested accordingly.</p><p>As shown in the drawing the A clock is applied as one input to driver circuit (33) which receives its other input from AND/invert gate (31). The C clock is applied to OR/invert gate (29) which receives the output of gate (31) as its other input. The output of gate (29) supplies driver circuit (34) which provides gating signals +C, -C. The B clock is applied to the second latch via invert gate (36). The outputs of gate (29) and driver (34) are connected as inputs to an OR/ inverter gate (35). The output of gate (35) is connected to the timing input + B of the latch (2) and prevent loading into the second polarity latch (2) of false data.</p> |
