DMN-8600 DVD Recorder System Processor
16-1
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
LSI Logic Confidential
Chapter 16
Clock Control and
Power Management
This chapter describes the clock control and power management for the
DMN-8600 and contains the following sections:
•
Section 16.1, “Clock and Power Registers”
•
Section 16.2, “Main PLL Power Down and Wake-Up Sequence”
As shown in
, the DMN-8600 has four clock generation PLLs:
main PLL, Video Out PLL, Audio Out PLL and Audio In PLL. An on-chip
software adjustable 13.5 MHz crystal oscillator or externally generated
13.5 or 27 MHz system clocks are used as the reference frequency for
the PLLs. The 13.5 MHz reference frequency is also used as the clock
for the PTS time stamp counters in the AV I/O and BIO units.
The DMN-8600 has a full power-down mode which shuts down all PLLs
and logic operating from the internally generated clocks. Power down
mode is exited by hardware reset. If SDRAM is in standby-refresh power
down mode, then the contents are preserved; otherwise, the contents are
lost. External wake-up events may be selected to automatically generate
a wake up reset. In addition, 14 submodules may be individually powered
down by gating off their clock tree. The submodules can be powered up
without resetting the entire chip.