Car Stereo System - Car Radio Digital Signal Processor User Manual

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7.7.3.9 PLLDIV Ratio Change Status Register
SM320C6455-EP
FIXED-POINT DIGITAL SIGNAL PROCESSOR
SPRS462B – SEPTEMBER 2007 – REVISED JANUARY 2008
Whenever a different ratio is written to the PLLDIV n registers, the PLLCTRL flags the change in the
PLLDIV ratio change status registers (DCHANGE). During the GO operation, the PLL controller will only
change the divide ratio of the SYSCLKs with the bit set in DCHANGE. Note that changed clocks will be
automatically aligned to other clocks. The PLLDIV divider ratio change status register is shown in
Figure 7-19 and described in Table 7-27 .
31 16
Reserved
R-0
15 5 4 3 2 0
Reserved SYS5 SYS4 Reserved
R-0 R-0 R-0 R-0
LEGEND: R/W = Read/Write; R = Read only; - n = value after reset
Figure 7-19. PLLDIV Divider Ratio Change Status Register (DCHANGE) [Hex Address: 029A 0144]
Table 7-27. PLLDIV Divider Ratio Change Status Register (DCHANGE) Field Descriptions
Bit Field Value Description
31:5 Reserved 0 Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.
4 SYS5 Identifies when the SYSCLK5 divide ratio has been modified.
0 SYSCLK5 ratio has not been modified. When GOSET is set, SYSCLK5 will not be affected.
1 SYSCLK5 ratio has been modified. When GOSET is set, SYSCLK5 will change to the new ratio.
3 SYS4 Identifies when the SYSCLK4 divide ratio has been modified.
0 SYSCLK4 ratio has not been modified. When GOSET is set, SYSCLK4 will not be affected.
1 SYSCLK4 ratio has been modified. When GOSET is set, SYSCLK4 will change to the new ratio.
2:0 Reserved 0 Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.
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