STMicroelectronics SPC572L series Reference Manual page 1855

RM0400
The selection of 16 inputs for each state logic is done at two level of muxing both of which
are shown in
•
Level 1 Muxing—At this level, there are 209 inputs. Out of these possible inputs, 63
inputs are selected. This selection is done using an 8:1 Mux. Therefore, sixty-four 8 × 1
muxes are required. The set of 63 watchpoints are passed to the second level of
muxing. The selection mechanism is shown in
•
Level 2 Muxing—At this level, 16 inputs are selected out of the 63 possible inputs for
each SLU. These 63 inputs consist of multiple set of 8 watchpoints from different
clients, processor exception signals, interrupt from clients, and event IN/OUT signals.
In addition, certain events from counters are used as feedback in the present state
logic of each state.
At level two there are 16 banks of 64:1 muxes for the selection of 16 inputs for one
state logic. The inputs to these Muxes are expected to be somewhat unique. In
general, care should be take to choose signal assignments that allow for key use cases
to be achieved without encountering concurrency restrictions. Since there are eight
such states, 16 × 8 banks of 64:1 mux are required. The selection mechanism is shown
in Figure
Figure 1097.
1097.
DocID027809 Rev 4
Sequence Processing Unit (SPU)
Figure 1097.
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