EP80579 Datasheet, PDF (107/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
2.1.3
Frequencies and Gear Ratios
This section discusses frequencies and gear ratios.
The IA core used in the EP80579 is an IA-32 core, and can run at frequencies between
600 and 1200 MHz (actually supported CPU frequencies vary by SKU, see
Chapter 47.0, “SKUs, Power Savings and Pre-Boot Firmware”). Based on divider ratios
in its PLL design, the IA-32 core imposes a 6:1 minimum core/bus frequency ratio. This
limits maximum FSB frequency to 400 or 533 MHz front-side bus (FSB) interface.
The IA-32 core/FSB frequency combinations supported are listed in Table 2-2.
Table 2-2.
IA-32 core / FSB Frequency Ratios (depends on SKU and configuration)
IA-32 core
[MHz]
600
1066
1200
FSB
[MHz]
400
533
533
Ratio
6:1
8:1
9:1
Table 2-3 summarizes the memory controller clock ratios.
Table 2-3.
Memory Controller Frequencies
DDR Clock
[MHz]
200
266
333
400
DDR Technology
DDR2-400
DDR2-533
DDR2-667
DDR2-800
2.2
Signaling Architecture
As defined in Table 2-4, the EP80579 supports communication between the IA, AIOC
devices (ASU, SSU, internal I/O devices) and externally attached bus master (PCI
Express* through different memory types using a variety of operations.
Table 2-4.
Summary of Communication
Operation
Agent
Read, Write
Atomic
IA
ASU
PCI-E DMA, EDMA
GbE
IA
ASU
PCI-E DMA, EDMA
GbE
Targeted Memory Type^a
External DRAM
(Coherent)
X
X
X
X
X
X
-
-
External DRAM
(AIOC Direct)
X^b
X
X^b
X
-
X
-
-
a. “X” cells are supported with normal or MMIO accesses and “-” cells are not supported.
August 2009
Order Number: 320066-003US
Intel^® EP80579 Integrated Processor Product Line Datasheet
107