MPC8245 datasheet(3/68 Pages) FREESCALE

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MPC8245 Integrated Processor Hardware Specifications, Rev. 10

Freescale Semiconductor

Features

The peripheral logic integrates a PCI bridge, dual universal asynchronous receiver/transmitter (DUART),

memory controller, DMA controller, PIC interrupt controller, a message unit (and I2O interface), and an

I2C controller. The processor core is a full-featured, high-performance processor with floating-point

support, memory management, a 16-Kbyte instruction cache, a 16-Kbyte data cache, and power

management features. The integration reduces the overall packaging requirements and the number of

discrete devices required for an embedded system.

An internal peripheral logic bus interfaces the processor core to the peripheral logic. The core can operate

at a variety of frequencies, allowing the designer to trade off performance for power consumption. The

processor core is clocked from a separate PLL that is referenced to the peripheral logic PLL. This allows

the microprocessor and the peripheral logic block to operate at different frequencies while maintaining a

synchronous bus interface. The interface uses a 64- or 32-bit data bus (depending on memory data bus

width) and a 32-bit address bus along with control signals that enable the interface between the processor

and peripheral logic to be optimized for performance. PCI accesses to the MPC8245 memory space are

passed to the processor bus for snooping when snoop mode is enabled.

The general-purpose processor core and peripheral logic serve a variety of embedded applications. The

MPC8245 can be used as either a PCI host or PCI agent controller.

2Features

Major features of the MPC8245 are as follows:

•

Processor core

— High-performance, superscalar processor core

— Integer unit (IU), floating-point unit (FPU) (software enabled or disabled), load/store unit

(LSU), system register unit (SRU), and branch processing unit (BPU)

— 16-Kbyte instruction cache

— 16-Kbyte data cache

— Lockable L1 caches—Entire cache or on a per-way basis up to three of four ways

— Dynamic power management: 60x nap, doze, and sleep modes

•

Peripheral logic

— Peripheral logic bus

– Various operating frequencies and bus divider ratios

– 32-bit address bus, 64-bit data bus

– Full memory coherency

– Decoupled address and data buses for pipelining of peripheral logic bus accesses

– Store gathering on peripheral logic bus-to-PCI writes

— Memory interface

– Up to 2 Gbytes of SDRAM memory

– High-bandwidth data bus (32- or 64-bit) to SDRAM

– Programmable timing supporting SDRAM

– One to eight banks of 16-, 64-, 128-, 256-, or 512-Mbit memory devices

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