Revision 1.23 - January 28, 2009
PPC405EX – PowerPC 405EX Embedded Processor
Data Sheet
OPB
The OPB provides 32-bit address and data interfaces, and operates up to 100MHz. There are bridges between the
OPB and the PLB.
Features include:
• Pipelined read support
• Dynamic bus sizing
• Single-cycle data transfer between masters and slaves
DCR Bus
The daisy-chained DCR bus provides a path for passing status and control information between the processor core
and the other on-chip cores. All DCRs are 32 bits in width with 10-bit addressing.
External Bus Controller
The external bus controller (EBC and EBM) transfers data between the PLB and external memory or peripheral
devices attached to the external peripheral bus. The EBC provides direct attachment of memory devices such as
ROM and SRAM, DMA device paced memory devices, and DMA peripheral devices.
Features include:
• From 33MHz to 100 MHz speed
• Data bus is 8, 16, or 32 bits with a 27-bit address bus
• Up to four chip selects
• Arbitration and multi-master supported
• Flash ROM interface
• Boot from 8- or 16-bit NOR Flash support
• Direct support for 8-,16-, or 32-bit SRAM and external peripherals
• External bus master support
NAND Flash Controller
The NAND Flash controller (NDFC) provides a simple interface between the External Bus Controller (EBC) and a
variety of NAND Flash-based storage devices.
Features include:
• Attachment as internal EBC slave device
• Eight- and 16-bit NAND Flash interface
• Up to four banks of NAND Flash supported
• Device sizes:
– 4MB and larger supported for read/write access
– 4MB to 256MB supported for boot-from-NAND flash (size supported depends on addressing mode)
• 512B + 16B or 2kB + 64B device page sizes supported
• ECC generation - hamming code, single-bit correction, double-bit detection (SEC/DED)
• Eight-bit command write, address write, and data read/write
• Interrupt on device ready (after long page write or block erase operations)
• Boot from NAND
– Executes up to 4KB of boot code out of first block
– Automatic page read accesses performed based on device configuration and read address
DMA Controller
The Direct Memory Access (DMA) controller is a Processor Local Bus (PLB) master that enables faster data
transfer between memory and peripherals than is possible under program control. The 4-channel DMA controller
handles data transfers between memory and peripherals and from memory-to-memory. Each channel has an
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AMCC Proprietary
AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
