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Alchemy Au1550-333MBD
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Alchemy Au1550-333MBD
General Info
Model NumberAu1550-333MBD
Part NumberAu1550-333MBDAA
IntroductionFebruary 24, 2004 (announced)
May 2004 (launched)
Release Price$21.26 (tray)
General Specs
Frequency333 MHz
Core SteppingAA
Word Size32 bit
Max Memory192 MiB
Max SMP1-Way (Uniprocessor)
Vcore1.2 V ± 10%
VI/O3.3 V
TDP1350 mW
TDP (Typical)400 mW
Tcase0 °C – 85 °C
Tstorage-40 °C – 125 °C

Au1550-333MBD was a 32-bit ultra low power embedded microprocessor with an Au1 CPU core implementing the MIPS32 ISA. Designed by AMD based on earlier Alchemy Semiconductor processors this SoC operates at a base frequency of up to 333 MHz with a typical TDP of 400 mW and maximum TDP of 1350 mW. It was also available with an industrial temperature range as Au1550-333MBF and is the Pb-free version of the Au1550-333MBC.


Main article: Au1 § Cache

[Edit/Modify Cache Info]

hierarchy icon.svg
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
0.0313 MiB
32,768 B
3.051758e-5 GiB
L1I$16 KiB
0.0156 MiB
16,384 B
1.525879e-5 GiB
1 × 16 KiB4-way set associative 
L1D$16 KiB
0.0156 MiB
16,384 B
1.525879e-5 GiB
1 × 16 KiB4-way set associativewrite-back

Memory controller[edit]

Au1550 processors integrate two independent memory controllers, an SDRAM controller which supports 3.3 V and 2.5 V SDR devices and 2.5 V DDR devices, and a static bus controller which supports SRAM, ROM, NAND Flash, NOR Flash, PCMCIA/CompactFlash devices, and 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.

[Edit/Modify Memory Info]

ram icons.svg
Integrated Memory Controller
Max TypeSDR-166, DDR-400
Supports ECCNo
Max Mem192 MiB
Width16 bit, 32 bit
Max Bandwidth1.332 GB/s
0.766 GiB/s
783.89 MiB/s
7.476041e-4 TiB/s
8.221655e-4 TB/s


  • PCI 2.2 controller, 32-bit bus, 33 or 66 MHz
  • USB 1.1 (OHCI) host controller, USB 1.1 device controller with OTG support
    • Two USB host ports and one device port (co-opting a host port in OTG mode)
  • Two 10/100 Mbit/s Ethernet MAC controllers
  • Four Programmable Serial Controllers supporting the AC97, I2S, SPI, and SMBus protocols
  • Three UARTs
  • Up to 43 GPIOs


This processor has no integrated graphics processing unit.


  • 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
  • SafeNet Security Engine to accelerate IP packet encryption/decryption in hardware
    • DES, 3DES, AES, ARC4 encryption algorithms
    • MD5, SHA1 hash algorithms
    • Supports header/trailer processing, padding, and initialization vector (IV) processing for IPsec packets
    • Supports a two-pass hash-then-encrypt implementation of the SSL protocol using either MD5 or SHA1 and 3DES or ARC4 ciphers
    • True entropy-based random number generator
  • RTC and TOY timer
  • Two interrupt controllers
  • Power management unit
  • MIPS EJTAG interface
  • Idle, Sleep, Hibernate Mode


  • 483-pin low profile, fine pitch plastic ball grid array (LF-PBGA) package
  • 25 × 25 grid, 0.8 mm pitch
  • 21 mm × 21 mm × 1.7 mm


Facts about "Alchemy Au1550-333MBD"
base frequency333 MHz (0.333 GHz, 333,000 kHz) +
core count1 +
core steppingAA +
core voltage1.2 V (12 dV, 120 cV, 1,200 mV) +
core voltage tolerance10% +
designerAMD +
familyAlchemy +
first announcedFebruary 24, 2004 +
first launchedMay 2004 +
full page namealchemy/au1550-333mbd +
has ecc memory supportfalse +
instance ofmicroprocessor +
io voltage3.3 V (33 dV, 330 cV, 3,300 mV) +
isaMIPS32 +
l1$ size0.0313 MiB (32 KiB, 32,768 B, 3.051758e-5 GiB) +
l1d$ description4-way set associative +
l1d$ size0.0156 MiB (16 KiB, 16,384 B, 1.525879e-5 GiB) +
l1i$ description4-way set associative +
l1i$ size0.0156 MiB (16 KiB, 16,384 B, 1.525879e-5 GiB) +
ldateMay 2004 +
market segmentEmbedded +
max case temperature358.15 K (85 °C, 185 °F, 644.67 °R) +
max cpu count1 +
max memory192 MiB (196,608 KiB, 201,326,592 B, 0.188 GiB, 1.831055e-4 TiB) +
max memory bandwidth0.766 GiB/s (1.332 GB/s, 783.89 MiB/s, 7.476041e-4 TiB/s, 8.221655e-4 TB/s) +
max memory channels1 +
max storage temperature398.15 K (125 °C, 257 °F, 716.67 °R) +
microarchitectureAu1 +
min case temperature273.15 K (0 °C, 32 °F, 491.67 °R) +
min storage temperature233.15 K (-40 °C, -40 °F, 419.67 °R) +
model numberAu1550-333MBD +
nameAlchemy Au1550-333MBD +
part numberAu1550-333MBDAA +
release price$ 21.26 (€ 19.13, £ 17.22, ¥ 2,196.80) +
release price (tray)$ 21.26 (€ 19.13, £ 17.22, ¥ 2,196.80) +
smp max ways1 +
supported memory typeSDR-166 + and DDR-400 +
tdp1.35 W (1,350 mW, 0.00181 hp, 0.00135 kW) +
tdp (typical)0.4 W (400 mW, 5.364e-4 hp, 4.0e-4 kW) +
technologyCMOS +
word size32 bit (4 octets, 8 nibbles) +