CONTROL_MODULE Registers
9.3.76 dpll_pwr_sw_ctrl Register (offset = 1318h) [reset = 0h]
The DPLL_PWR_SW_CTRL register, in conjunction with the DPLL_PWR_SW_STATUS register, can be
used to power off the digital power domain of the 3 DPLLS – DDR, DISP, PER to save leakage power in
deep-sleep power modes. This register gives control over the power switch signals of the individual
DPLLS.
A specific sequence has to be followed while programming the RET, PONIN, PGOODIN, ISO and RESET
signals to put the PLLs in to low power mode and bring it out of low power mode.
In normal operating mode, the PRCM controls the RESET of the DPLLS. The RET, PONIN, PGOODIN
and ISO are tied off. An over-ride bit is provided in this register SW_CTRL_*_RESET, which when set
allows S/W to control the RESET, RET, PONIN, PGOODIN and ISO of the DPLLs to enable entry/exit into
DPLL low power modes.
dpll_pwr_sw_ctrl is shown in
and described in
.
Figure 9-79. dpll_pwr_sw_ctrl Register
31
30
29
28
27
26
25
24
sw_ctrl_ddr_pll
Reserved
isoscan_ddr
ret_ddr
reset_ddr
iso_ddr
pgoodin_ddr
ponin_ddr
R-0h
R-0h
R-0h
R-0h
R-0h
R-0h
R-1h
R-1h
23
22
21
20
19
18
17
16
sw_ctrl_disp_pll
Reserved
isoscan_disp
ret_disp
reset_disp
iso_disp
pgoodin_disp
ponin_disp
R-0h
R-0h
R-0h
R-0h
R-0h
R-0h
R-1h
R-1h
15
14
13
12
11
10
9
8
sw_ctrl_per_dpll
Reserved
isoscan_per
ret_per
reset_per
iso_per
pgoodin_per
ponin_per
R-0h
R-0h
R-0h
R-0h
R-0h
R-0h
R-1h
R-1h
7
6
5
4
3
2
1
0
Reserved
R-0h
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 9-86. dpll_pwr_sw_ctrl Register Field Descriptions
Bit
Field
Type
Reset
Description
31
sw_ctrl_ddr_pll
R/W
0h
Enable software control over DDR DPLL RET, RESET, ISO,
PGOODIN, PONIN for power savings.
0: PRCM controls the DPLL reset, RET = 0, ISO = 0, PGOODIN = 1,
PONIN = 1.
1: Controlled by corresponding bits in this register.
30
Reserved
R
0h
29
isoscan_ddr
R/W
0h
Drives ISOSCAN of DDR PLL.
28
ret_ddr
R/W
0h
Drives RET signal of DDR PLL.
27
reset_ddr
R/W
0h
Drives RESET of DDR DPLL.
26
iso_ddr
R/W
0h
Drives ISO of DDR DPLL.
25
pgoodin_ddr
R/W
1h
Drives PGOODIN of DDR DPLL.
24
ponin_ddr
R/W
1h
Drives PONIN of DDR DPLL.
23
sw_ctrl_disp_pll
R/W
0h
Enable software control over DISP DPLL RET, RESET, ISO,
PGOODIN, PONIN for power savings.
0: PRCM controls the DPLL reset, RET = 0, ISO = 0, PGOODIN = 1,
PONIN = 1.
1: Controlled by corresponding bits in this register.
22
Reserved
R
0h
21
isoscan_disp
R/W
0h
Drives ISOSCAN of DISP PLL.
20
ret_disp
R/W
0h
Drives RET of DISP DPLL.
19
reset_disp
R/W
0h
Drives RESET of DISP DPLL.
840
Control Module
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated