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PXN20PB Datasheet, PDF (8/23 Pages) Freescale Semiconductor, Inc – 32-bit Power Architecture® Dual Core Microcontrollers for Industrial Networking | |||
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Features
â IEEE® 754 compatible with software wrapper
â Single precision in hardware; double precision with software library
â Conversion instructions between single precision floating point and fixed point
⢠Wait instruction
⢠Extensive system development support through Nexus debug module
2.6.2 I/O Processor High Performance e200z0 Core (IOP)
The IOP supports the following features:
⢠High performance, low cost e200z0 core processor for managing peripherals and interrupts
⢠Single issue 4-stage pipelined in-order execution, 32-bit Power Architecture® CPU
⢠Variable length encoding (VLE), allowing mixed 16-bit and 32-bit instructions
â Results in efficient code size footprint
â Minimizes impact on performance
⢠Branch processing acceleration using lookahead instruction buffer
⢠Load/store unit
â 1-cycle load latency
â Misaligned access support
â No load-to-use pipeline bubbles
⢠Thirty-two 32-bit general purpose registers (GPRs)
⢠Hardware vectored interrupt support
⢠Reservation instructions for implementing read-modify-write constructs
⢠Multi-cycle divide (divw) and load multiple (lmw) store multiple (smw) multiple class
instructions, can be interrupted to prevent increases in interrupt latency
⢠Extensive system development support through Nexus debug port
2.6.3 On-Chip Flash
On-chip flash on the PXN20 devices features the following:
⢠2 MB burst flash memory
â Flash partitioning: 4 ï´ 16 KB; 4 ï´ 16 KB; 2 ï´ 64 KB; 2 ï´ 128 KB; 6 ï´ 256 KB
â 16 KB shadow flash blocks
â Typical flash access time: 0 wait-state for buffer hits, 3 wait-states for page buffer miss at
116 MHz
â 64-bit ECC with single-bit correction, double-bit detection for data integrity
⢠Dual flash ports to minimize access contention between main core and IOP
â Each port supported with separate page buffers
⢠Flash page buffers to improve access time to code and data held in flash
â 4 ï´ 128-bit page buffers with programmable prefetch control for flash access
PXN20 Product Brief, Rev. 1
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Freescale Semiconductor
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