2.3.4 RS Latch
The RS latch has basically the same functions as an SR latch, except in the
Forbidden state where both S and R equal ‘1
’. In this state, an SR
latch output will become ‘1
’, but on the RS the output will be
‘0
’.
The S-input is driven by the even LUT output (LUT0), and the R-input is driven by the odd LUT output (LUT1).
S | R | OUT |
---|---|---|
0 | 0 | Hold state (no change) |
0 | 1 | Clear |
1 | 0 | Set |
1 | 1 | Forbidden |