Power, Reset, and Clock Management
8.1.12.2.36 CM_CLKMODE_DPLL_PER Register (offset = 8Ch) [reset = 4h]
CM_CLKMODE_DPLL_PER is shown in
and described in
This register allows controlling the DPLL modes.
Figure 8-119. CM_CLKMODE_DPLL_PER Register
31
30
29
28
27
26
25
24
Reserved
R-0h
23
22
21
20
19
18
17
16
Reserved
R-0h
15
14
13
12
11
10
9
8
DPLL_SSC_TYPE
DPLL_SSC_DOWNS
DPLL_SSC_ACK
DPLL_SSC_EN
Reserved
PREAD
R/W-0h
R/W-0h
R-0h
R/W-0h
R-0h
7
6
5
4
3
2
1
0
Reserved
DPLL_EN
R-0h
R/W-4h
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 8-127. CM_CLKMODE_DPLL_PER Register Field Descriptions
Bit
Field
Type
Reset
Description
31-16
Reserved
R
0h
15
DPLL_SSC_TYPE
R/W
0h
Select Triangular Spread Spectrum clocking.
Always write 0.
0 = Triangular Spread Spectrum Clocking is selected.
1 = Reserved.
14
DPLL_SSC_DOWNSPRE
R/W
0h
Control if only low frequency spread is required
AD
0x0 = FULL_SPREAD : When SSC is enabled, clock frequency is
spread on both sides of the programmed frequency
0x1 = LOW_SPREAD : When SSC is enabled, clock frequency is
spread only on the lower side of the programmed frequency
13
DPLL_SSC_ACK
R
0h
Acknowledgement from the DPLL regarding start and stop of Spread
Spectrum Clocking feature
0x0 = Disabled : SSC has been turned off on PLL o/ps
0x1 = Enabled : SSC has been turned on on PLL o/ps
12
DPLL_SSC_EN
R/W
0h
Enable or disable Spread Spectrum Clocking
0x0 = Disabled : SSC disabled
0x1 = Enabled : SSC enabled
11-3
Reserved
R
0h
2-0
DPLL_EN
R/W
4h
DPLL control.
Upon Warm Reset, the PRCM DPLL control state machine updates
this register to reflect DPLL Low Power Stop mode.
0x0 = Reserved : Reserved
0x1 = DPLL_LP_STP_MODE : Put the DPLL in Low Power Stop
mode
0x2 = Reserved2 : Reserved2
0x3 = Reserved3 : Reserved
0x4 = DPLL_MN_BYP_MODE : Put the DPLL in MN Bypass mode.
The DPLL_MULT register bits are reset to 0 automatically by putting
the DPLL in this mode.
0x5 = DPLL_LP_BYP_MODE : Put the DPLL in Idle Bypass Low
Power mode.
0x6 = Reserved6 : Reserved
0x7 = DPLL_LOCK_MODE : Enables the DPLL in Lock mode
652
Power, Reset, and Clock Management (PRCM)
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated