Техническая Спецификация для Intel D2500 DF8064101055400
Модели
DF8064101055400
Datasheet - Volume 1 of 2
49
4.3
Processor Clocking
BCLKP, BCLKN, HPL_CLKINP, HPL_CLKINN, EXP_CLKINP, EXP_CLKINN,
DPL_REFCLKINP, DPL_REFCLKINN
The processor utilizes differential clocks to generate the processor core(s) and uncore
operating frequencies, memory controller frequency, and other internal clocks. The
processor core frequency is determined by multiplying the processor core ratio by
100 or 133 MHz. Clock multiplying within the processor is provided by an internal phase
locked loop (PLL), which requires a constant frequency input, with exceptions for
Spread Spectrum Clocking (SSC).
HPLL, DMIPLL and MPLL expecting the reference source clock will be generated by the
same PLL and SS logic in the external clock generation
4.3.1
PLL Power Supply
An on-die PLL filter solution is implemented on the processor. Refer to
DC specifications and to the Platform Design Guide for decoupling and routing
guidelines.
Table 4-28.PLL Reference Clock
PLL Reference
Pins/Balls
Frequency
Description
Host PLL (HPLL)
HPLL_REFCLK_P,
HPLL_REFCLK_N
HPLL_REFCLK_N
100 MHz
Drives all MCH core clocks,
Gfx, Video, Display and
provides reference for CPU
PLLs.
DDRIO PLL
(MPLL)
DDR3_REFCLKP,
DDR3_REFCLKN
DDR3_REFCLKN
100 MHz
DDRIO PLL must be
matched to clock DDR at
the same transfer rate as
fused for HPLL.
DMIIO PLL
(DMIPLL)
DMI_IREFCLKP,
DMI_IREFCLKN
DMI_IREFCLKN
100 MHz
For the DMI interface to
the ICH which operates at
Gen1 speeds.
Display I/O Fixed
Ref Clock
(DPLL0)
DPL_REFCLKP,
DPL_REFCLKN
DPL_REFCLKN
27 XTAL, 96, 100 Fixed
Frequency.
27 MHz XTAL required to
reduce error to <1000
ppm. DPLL0 is non SSC
clock
Display I/O SSC
Ref Clock
(DPLL1)
DPL_REFSSCCLKP,
DPL_REFSSCCLKN
DPL_REFSSCCLKN
100 SSC.
If SSC is used for display,
it must be connected at
this pins. SSC enables
better emissions testing
performance (EMI) at the
system level. Internally
DPLL0 and DPLL1 can use
each others’ reference
clock.
CPU Core PLLs
(CPLL)
NONE
N/A
Derived from HPLL.