OMAP3525-HIREL Datasheet, PDF (117/239 Pages) Texas Instruments – OMAP3525-HiRel and OMAP3530-HiRel Applications Processors

www.ti.com
OMAP3525-HiRel and OMAP3530-HiRel Applications Processors
SPRS599 – JUNE 2009
4.3.1.3 DPLL3 (CORE)
DPLL3 supplies all interface clocks and also a few module functional clocks. It can be also source of the
emulation trace clock. It is located in the core domain area. All interface clocks and a few module
functional clocks are generated in the CM. When the core domain is on, it can be used as a bypass input
to DPLL1 and DPLL2.
4.3.1.4 DPLL4 (Peripherals)
DPLL4 generates clocks for the peripherals. It supplies five clock sources: 96-MHz functional clocks to
subsystems and peripherals, 54 MHz to TV DAC, display functional clock, camera sensor clock, and
emulation trace clock. It is located in the core domain area. All interface clocks and few module functional
clocks are generated in the CM. Its outputs to the DSS, PER, and EMU domains are propagated with
always-on clock trees.
4.3.1.5 DPLL5 (Second peripherals DPLL)
DPLL5 supplies the 120-MHz functional clock to the CM.
4.3.2 Delay-Locked Loops (DLL)
The SDRC includes analog-controlled delay technology for interfacing high-speed mobile DDR memory
components. For more information, see the SDRC-GPMC chapter of the OMAP35x Technical Reference
Manual (TRM) [literature number SPRUF98]. A DLL is a calibration module used on dynamic track of
voltage and temperature variations, as well as to compensate the silicon process dispersion.
The SDRC DLL has four modes of operation:
1. APPLICATION MODE 0: used to generate 72° delay
2. APPLICATION MODE 1: used to generate 90° delay
3. MODEMAXDELAY: used for low frequency operation where we do not have the requirement of
accurate 72° or 90° phase shift
4. IDLE MODE: a low-power state that allows the DLL to gain lock quickly on exit from this mode
Submit Documentation Feedback
CLOCK SPECIFICATIONS 117