Freescale Semiconductor MPC8250, Family Reference Manual

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Overview
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
1-2 Freescale Semiconductor
— Floating-point unit (FPU) supports floating-point arithmetic.
— Support for cache locking.
• Low-power consumption
• Separate power supply for internal logic (2.5 V) and for I/O (3.3 V)
• Separate PLLs for G2 core and for the CPM
— G2 core and CPM can run at different frequencies for power/performance optimization
— Internal G2 core/bus clock multiplier that provides 1.5:1, 2:1, 2.5:1, 3:1, 3.5:1, 4:1, 4.5:1, 5:1,
5.5:1, 6:1, 7:1, 8:1 ratios
— Internal CPM/bus clock multiplier that provides 2:1, 2.5:1, 3:1, 3.5:1, 4:1, 5:1, 6:1 ratios
• 64-bit data and 32-bit address 60x bus
— Bus supports multiple master designs
— Supports single transfers and burst transfers
— 64-, 32-, 16-, and 8-bit port sizes controlled by on-chip memory controller
— Supports data parity or ECC and address parity
• 32-bit data and 18-bit address local bus
— Single-master bus, supports external slaves
— Eight-beat burst transfers
— 32-, 16-, and 8-bit port sizes controlled by on-chip memory controller
• 60x-to-PCI bridge (MPC8250, MPC8265, and MPC8266 only)
— Programmable host bridge and agent
— 32-bit data bus, 66 MHz, 3.3 V
— Synchronous and asynchronous 60x and PCI clock modes
— All internal address space available to external PCI host
— DMA for memory block transfers
— PCI-to-60x address remapping
• System interface unit (SIU)
— Clock synthesizer
— Reset controller
— Real-time clock (RTC) register
— Periodic interrupt timer
— Hardware bus monitor and software watchdog timer
— IEEE 1149.1 JTAG test access port
• Twelve-bank memory controller
— Glueless interface to SRAM, page mode SDRAM, DRAM, EPROM, Flash and other
user-definable peripherals
— Byte write enables and selectable parity generation
— 32-bit address decodes with programmable bank size