Overview

STn8810

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1.4

ARM926EJ processor

The STn8810 CPU is an ARM926EJ reduced instruction set computer (RISC) processor.

This 32-bit processor core supports 32-bit ARM® and 16-bit Thumb instruction sets,

enabling the user to trade off between high performance and high code density.

The cached ARM CPU features a memory management unit (MMU) and is clocked at

264 MHz. It has a 32-Kbyte instruction cache and a 16-Kbyte data cache, and supports the

Jazelle™ extensions for Java acceleration.

It also includes an embedded trace module (ETM Medium+) for real-time CPU activity

tracing and debugging. It supports 4-bit and 8-bit normal trace mode and 4-bit demultiplexed

trace mode, with normal or half-rate clock.

1.5

Embedded memory units

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32 Kbytes of public ROM (for boot purposes)

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64 Kbytes of secured ROM (for security purposes)

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40 Kbytes of public RAM

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16 Kbytes of secured RAM (for security code and/or data)

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1 Kbyte backup

1.6

Advanced security

The device contains 64 Kbytes of ROM and 16 Kbytes of RAM that are only accessible

when the system is in a trusted environment. An advanced security framework enables M-

commerce as well as authentication applications drawing on ST smartcard expertize:

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SHA-1/DES/3DES hardware accelerators

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True random number generator (RNG)

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Secured watchdog timer

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Unique die identification

1.7

Flexible static memory controller (FSMC)

The FSMC interfaces to off-chip multiplexed burst NOR Flash memory devices and NAND

Flash memory devices, and to CompactFlash/CF+ cards. The FSMC manages up to 3 chip-

selects of NOR Flash memories, and up to 2 chip-selects of NAND Flash memories or

CompactFlash/CF+ devices. The memory controller features error code correction

accelerated by hardware that reduces host CPU workload to support NAND Flash very fast

read/write transfers.

1.8

SDRAM memory controller (SDMC)

The SDMC is used to interface with single-data rate SDRAM (SDR-SDRAM) at 100 MHz

and double-data rate SDRAM (DDR-SDRAM) at 133 MHz. The SDMC manages up to two

chip-selects of 16-bit wide SDR-SDRAM or DDR-SDRAM. It can address up to 256 Mbytes

of SDRAM.