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Alchemy Au1250-700MGD
General Info
Designer	RMI
Model Number	Au1250-700MGD
Part Number	Au1250-700MGD
Market	Embedded
General Specs
Family	Alchemy
Frequency	700 MHz
Microarchitecture
ISA	MIPS32
Microarchitecture	Au1
Technology	CMOS
Word Size	32 bit
Cores	1
Max Memory	512 MiB
Multiprocessing
Max SMP	1-Way (Uniprocessor)
Electrical
VI/O	3.3 V

Au1250-700MGD was a 32-bit ultra low power embedded microprocessor with an Au1 CPU core implementing the MIPS32 ISA. Designed by RMI based on earlier AMD and Alchemy Semiconductor processors this SoC operates at a base frequency of up to 700 MHz.

Cache

Main article: Au1 § Cache

[Edit/Modify Cache Info]

Cache Organization Cache is a hardware component containing a relatively small and extremely fast memory designed to speed up the performance of a CPU by preparing ahead of time the data it needs to read from a relatively slower medium such as main memory. The organization and amount of cache can have a large impact on the performance, power consumption, die size, and consequently cost of the IC. Cache is specified by its size, number of sets, associativity, block size, sub-block size, and fetch and write-back policies. Note: All units are in kibibytes and mebibytes.

L1$ 32 KiB 32,768 B 0.0313 MiB L1I$ 16 KiB 16,384 B 0.0156 MiB 1 × 16 KiB 4-way set associative   L1D$ 16 KiB 16,384 B 0.0156 MiB 1 × 16 KiB 4-way set associative write-back

Memory controller

Au1250 processors integrate two independent memory controllers, a DRAM controller which supports 2.5 V DDR and 1.8 V DDR2 SDRAM devices, and a static bus controller which supports SRAM, ROM, NAND Flash, NOR Flash, PCMCIA/CompactFlash devices, IDE PIO mode, and other I/O peripherals. The CPU core, the memory controllers, and other integrated peripherals are linked by an internal 32-bit System Bus (SBUS). The SDRAM clock is configurable 1/1 or 1/2 of the SBUS frequency, which is configurable 1/2, 1/3, or 1/4 of the core frequency. The integrated LCD and MAE peripherals can access the SDRAM controller through a 64-bit side bus running at the SBUS frequency.

[Edit/Modify Memory Info]

	Integrated Memory Controller
	Max Type DDR-400, DDR2-533 Supports ECC No Max Mem 512 MiB Controllers 1 Channels 1 Width 16 bit, 32 bit Max Bandwidth 1.867 GB/s 1.739 GiB/s 1,780.51 MiB/s 1,867 MB/s 0.0017 TiB/s 0.00187 TB/s

Expansions

• USB 2.0 (EHCI) and 1.1 (OHCI) host controller, USB 2.0 device controller with OTG support
  • One USB host port and one host/device port, each low/fast/high speed capable
• Two Secure Digital/SDHC/SDIO/MMC 1.1 controllers
• Two Programmable Serial Controllers supporting the AC97, I2S, SPI, and SMBus protocols
• Two UARTs
• Up to 48 GPIOs

Graphics

This processor integrates an LCD controller for panels with a resolution up to 2048 × 2048 pixels.

• TFT: 1/2/4/8-bit mono, 12/16/18/24-bit color
• STN: 4/8-bit mono single-scan, 8-bit color single-scan, 16-bit color dual-scan
• Frame buffer formats:
  • 1/2/4/8-bpp pass through/grayscale/palettized
  • 16-bpp 6:5:5, 5:6:5, 5:5:6, 5:5:5:1, 4:4:4:0
  • 24-bpp 8:8:8:0
  • 32-bpp 8:8:8:8 RGBA
• Four overlay windows with double buffering
• Gamma correction, alpha blending, and chroma keying
• 32 × 32 × 2 bpp hardware cursor

Features

• Camera Interface Module (CIM)
  • ITU-R BT.656 compatible 8/9/10-bit bus running at up to 33 MHz
  • Support for UYVY and Bayer RGB to planar format conversion
• Media Acceleration Engine (MAE) to accelerate video decoding in hardware
  • Formats MPEG-1/2/4, DivX-3/4/5, H.263, WMV9, VC-1
  • Accelerates inverse quantization, inverse DCT, motion compensation, WMV9 filters
  • Hardware colorspace conversion and scaling with 4-tap filter, also for CIM
  • Video decode resolution up to D1 720 × 480 NTSC / 720 × 576 PAL
• 16-channel descriptor-based DMA controller
  • Memory to memory, memory to peripheral, peripheral to memory, peripheral to peripheral
  • 36-bit source and destination addresses with no alignment requirement
  • Scatter/gather and stride transfers
  • Compare and branch descriptors
• AES-128 encryption/decryption in hardware with ECB, CBC, CFB, and OFB block cipher modes
• RTC and TOY timer
• Two interrupt controllers
• Power management unit
• MIPS EJTAG interface
• Idle, Sleep, Hibernate Mode

Package

• 372-pin low profile, fine pitch plastic ball grid array (LF-PBGA) package
• 23 × 23 grid, 0.8 mm pitch
• 19 mm × 19 mm × 1.4 mm

Bibliography

• "RMI Alchemy™ Au1210™ Navigation Processor and Au1250™ Media Processor Data Book", RMI Corp., Rev. A, April 2007
• "Ultra Low-Power Embedded Processor Family", netlogicmicro.com, archived December 14, 2010