The Low Power concept we are going to introduce today is the SRPG Cell, the full name of the State Retention Power Gating Cell. This is a special kind of register. For a normal register, if the power is turned off, the original data cannot be saved. After the power is reconnected, the original data will be lost. Therefore, we can create a device similar to a backup for some registers that must maintain data. The data of the register is saved to the backup device before the power is turned off; after the power is turned on, the data is rewritten into the register from the backup device.
The SRPG cell operates in the VDD voltage domain and is a voltage domain that can be turned off. D, Clk, Ret, and Q are the control and output signals of the registers. When this register is powered off, some of the power supply will always be powered, that is, the Ret circuit operates in the VDD voltage domain and will not be turned off. When the "Save" signal is valid, Ret will save the value of the register; when "Restore" is valid, Ret will write the saved value to the register. It should be noted that an SRPG Cell is generally about 20% larger than the normal register area.
Let's take a look at the SRPG cell in the UPF file:
Set_retention ret_va1 \ srpg cell prefix
-domain VA1 \ specify voltage area
-retention_supply_set ss_va1_base \ Specify the supply set of the srpg cell
-save_condition save_en1 \ Specify the conditions under which the srpg cell "save" signal is valid
-restore_condition restore_en1 specifies the conditions under which the srpg cell "restore" signal is valid
Set_retention ret_va2 \
-domain VA2\
-retention_supply_set ss_top \
-save_condition save_en2 \
-restore_condition restore_en2
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