Intel PXA250 and PXA210 Applications Processors

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SA-1110/Applications Processor Migration A.3.1 Intel® XScale Microarchitecture The PXA250 applications processor is a system on a chip that includes Intel’s new microprocessor megacell. This includes Intel® Superpipelined Technology and a new optimized cache architecture that allows program execution to continue despite data cache misses. The PXA250 applications processor supports: • ARM* Architecture v5 instructions, including ARM’s Thumb extensions • DSP Extensions but not ARM’s optional Vector Floating Point instructions Appendix A in the Intel 80200 Developers’ manual, Order# 273411-002 [http:// developer.intel.com], is the best guide to the new capabilities available in the Intel® XScale Megacell's Instruction Set. Using a software development toolset that takes specific advantage of Intel® XScale microarchitecture, and Intel® Media Processing Technology could give you substantial performance benefits. The PXA250 applications processor offers increased performance at similar clock rates, and also a wider range of operating clock rates at lower voltages. The overall benefit is more work done for less battery power. A.3.2 Debugging New PXA250 hardware creates new debugging possibilities. You can use the JTAG test port to download programs into a dedicated memory area to act as a debug monitor. Applications can be inspected and performance data, such as cache hit rates, can be measured via a dialog over JTAG. These features offer developers far more visibility inside a PXA250 system improving time to market. A.3.3 Cache Attributes The PXA250 applications processor has twice the instruction cache and four times the data cache of the SA-1110. The Caches can be locked for optimized code or data and for reliability the caches are now covered by parity protection. To take advantage of cache locking software, data must be selected and specifically loaded and locked into cache. To take advantage of new features such as Write-Through mode for external IO buffers, page tables will need to be revisited in boot software. A.3.4 Other features As mentioned before, the PXA250 DMA controller is highly versatile. With 16 channels it can be utilized as: • Several serial ports in parallel • A general-purpose memory move capability • A fast interface for external companion devices A-8 PXA250 and PXA210 Applications Processors Design Guide
SA-1110/Applications Processor Migration Additional software is required to access these benefits. A similar story is true for AC’97, I2C, GPIOs, MMC and others. The benefits are substantial, but new hardware and software will be necessary to effectively use the PXA250 applications processor. A.3.5 Conclusion Although most application software will migrate unchanged between SA-1110 and the PXA250 applications processors, the underlying microarchitectures are radically different. The PXA250 applications processor being considerably more ornate and capable than the SA-1110. The majority of hardware and low-level software from any SA-1110 design will need to be redesigned. with a view to taking full advantage of the new features that the PXA250 applications processor brings to the handheld market. PXA250 and PXA210 Applications Processors Design Guide A-9
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Intel ® PXA250 and PXA210 Applicat
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Contents Contents 1 Introduction...
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Contents A.1 SA-1110 Hardware Migra
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Contents 2-7 SRAM / ROM / Flash / S
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Introduction 1 Table 1-1. Revision
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Introduction • System memory inte
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Introduction Table 1-3. Signal Pin
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Introduction Figure 1-2. PXA250 App
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Introduction Table 1-4. PXA250 Appl
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Introduction Figure 1-3. PXA210 App
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Introduction Table 1-5. PXA210 Appl
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System Memory Interface 2 This sect
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System Memory Interface Table 2-1.
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. System Memory Interface 2.4 SDRAM
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System Memory Interface Figure 2-5.
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System Memory Interface Figure 2-6.
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System Memory Interface 2.7 System
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LCD Display Controller 3 This chapt
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LCD Display Controller Figure 3-1.
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LCD Display Controller Figure 3-5.
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Page 63 and 64: AC97 6 The AC97 controller unit (AC
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BBPXA2xx Development Baseboard Sche
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DCPXA250 Processor Card 32-bit vers
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DCPXA210 Processor Card 4 CONNECTOR
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Intel PXA250 and PXA210 Applications Processors

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