Power, Reset, and Clock Management
8.1.12.2.35 CM_CLKMODE_DPLL_MPU Register (offset = 88h) [reset = 4h]
CM_CLKMODE_DPLL_MPU is shown in
and described in
This register allows controlling the DPLL modes.
Figure 8-118. CM_CLKMODE_DPLL_MPU 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
DPLL_REGM4XEN
DPLL_LPMODE_EN DPLL_RELOCK_RAM DPLL_DRIFTGUARD
PREAD
P_EN
_EN
R/W-0h
R/W-0h
R-0h
R/W-0h
R-0h
R/W-0h
R/W-0h
R/W-0h
7
6
5
4
3
2
1
0
DPLL_RAMP_RATE
DPLL_RAMP_LEVEL
DPLL_EN
R/W-0h
R/W-0h
R/W-4h
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 8-126. CM_CLKMODE_DPLL_MPU 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
DPLL_REGM4XEN
R
0h
Enable the REGM4XEN mode of the DPLL.
Please check the DPLL documentation to check when this mode can
be enabled.
10
DPLL_LPMODE_EN
R/W
0h
Set the DPLL in Low Power mode.
Check the DPLL documentation to see when this can be enabled.
0x0 = DISABLED : Low power mode of the DPLL is disabled
0x1 = ENABLED : Low power mode of the DPLL is enabled
9
DPLL_RELOCK_RAMP_E R/W
0h
If enabled, the clock ramping feature is used applied during the lock
N
process, as well as the relock process.
If disabled, the clock ramping feature is used only during the first
lock.
650
Power, Reset, and Clock Management (PRCM)
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated