M4A3-384/256-55JNC Просмотр технического описания (PDF) - Lattice Semiconductor
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M4A3-384/256-55JNC Datasheet PDF : 63 Pages
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A reset/preset swapping feature in each macrocell allows for reset and preset to be exchanged, providing
flexibility. In asynchronous mode (Figure 8), a single individual product term is provided for initialization.
It can be selected to control reset or preset.
Power-Up
Reset
Power-Up
Preset
Individual
Reset
Product Term
Individual
Preset
Product Term
AP AR
D/L/T Q
AP AR
D/L/T Q
a. Reset
b. Preset
17466G-014
Figure 8. Asynchronous Mode Initialization Configurations
17466G-015
Note that the reset/preset swapping selection feature effects power-up reset as well. The initialization
functionality of the flip-flops is illustrated in Table 9. The macrocell sends its data to the output switch
matrix and the input switch matrix. The output switch matrix can route this data to an output if so desired.
The input switch matrix can send the signal back to the central switch matrix as feedback.
Table 9. Asynchronous Reset/Preset Operation
AR
AP
CLK/LE1
Q+
0
0
X
See Table 8
0
1
X
1
1
0
X
0
1
1
X
0
Note:
1. Transparent latch is unaffected by AR, AP
ispMACH 4A Family
13
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