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The SSE-200 subsystem defines a control matrix that allows the power mode (ON state) of one domain to affect another power domain.
The following table shows how this matrix is structured.
Table 2-13 PDCM structure
The left column of the table lists the power dependency inputs while the heading row lists the power domains that are being controlled. The power dependency inputs are either:
If a power domain is sensitive to a dependency input, after the controlled power domain is ON, the power domain remains ON while any of the dependency inputs is HIGH. Therefore the PDCM is used primarily to define when a power domain must not enter a lower power state. It is not designed to support powering up of any power domain.
The power control matrix interactions have the following features:
For the PD_SYS power domain:
It can be requested to turn ON either by any GPR, by any EWC or by its associated Power Q-Channel Interface. PD_SYS remains ON when any of the other power domains in the system not related to debug, are ON.
For any PD_SRAM<n>:
Each can be woken by sending access to the SRAM.
The PDCM and sensitivity inputs for each power domain allows for the power control of the system to be primarily performed using only dynamic power transitions. This reduces the number of software interactions that are required for system management and therefore improves its responsiveness and contributes to further power reduction.