SPEAR1310 datasheet(13/57 Pages) STMICROELECTRONICS

13 / 57 page

SPEAr1310

Clock and reset system

Doc ID 17528 Rev 4

13/57

Clock and reset system

This centralized structure provides system synchronization and includes the following

features:

●

Six PLLs. Four of them are fully programmable and offer an EMI reduction mode

(spread spectrum clock generation through dithering) that can replace all traditional

EMI reduction techniques.

–

PLL1 programmable dithered pll, dedicated for Core1 & 2 & AXI/AHB bus &

peripherals. Both core need to run at the same speed

–

PLL2 programmable dithered PLL, dedicated for the 125 MHz clock of the Gigabit

Ethernet MACs

–

PLL3 programmable dithered PLL, for specific embedded IP functions

–

PLL4 programmable dithered PLL, dedicated for the DDR memory controller

(Asynchronous access memory mode)

–

PLL5 low jitter, dedicated for the USB

–

PLL6 for the PCIe controllers

●

Several synthesizers provide different frequencies for different IPs

●

Fully programmable control of clock and reset signals for all slave blocks allowing

sophisticated power management.

SPEAR1310 Datasheet(PDF) 13 Page - STMicroelectronics