OMAP3515 Datasheet, PDF (117/227 Pages) Texas Instruments – Applications Processor

www.ti.com
OMAP3515/03 Applications Processor
SPRS505 – FEBRUARY 2008
• Fed with always-on system clock with independent gating control per DPLL
• Analog part supplied through dedicated power supply (1.8 V) and an embedded LDO to get rid of
1-MHz noise
• Up to five independent output dividers for simultaneous generation of multiple clock frequencies
4.3.1.1 DPLL1 (MPU)
DPLL1 is located in the MPU subsystem and supplies all clocks of the subsystem. All MPU subsystem
clocks are internally generated in the subsystem. When the core domain is on, it can use the DPLL3
(CORE DPLL) output as a high-frequency bypass input clock.
4.3.1.2 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.
4.3.1.3 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.
4.3.1.4 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 OMAP35xx ES2.0 Technical
Reference Manual (TRM) [literature number TBD]. 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