AM386SX Datasheet, PDF (1/30 Pages) Advanced Micro Devices – High-Performance, Low-Power, Embedded Microprocessors

FINAL
Am386^®SX/SXL/SXLV
High-Performance, Low-Power, Embedded Microprocessors
DISTINCTIVE CHARACTERISTICS
s Member of the E86™ CPU series
– 16-bit data bus
– 24-bit address bus
– 16-Mbyte address range
– Long-term stable supply from AMD
s 40-, 33- and 25-MHz operating speeds
s Ideal for embedded applications
– True Static design for low-power applications
– 3–5 V operation (at 25 MHz)
– Ideal for cost-sensitive designs
– True DC (0 MHz) operation
s Industry Standard Architecture
– Supports world’s largest software base for x86
architectures
– Wide range of chipsets and BIOS available
GENERAL DESCRIPTION
The Am386®SX/SXL/SXLV microprocessors are low-
cost, high-performance CPUs for embedded applica-
tions. Embedded customers benefit from using the
Am386 microprocessor in a number of ways.
The Am386SX/SXL/SXLV microprocessors provide
embedded customers access to very inexpensive pro-
cessors and the highest performance of any 386SX
available anywhere. The 16-bit data path allows for in-
expensive memory design. Full static operation, cou-
pled with 3-V supplies, benefit customers who desire
low-power designs. Standby Mode allows the
Am386SXL/SXLV microprocessors to be clocked
down to 0 MHz (DC) and retain full register contents. A
float pin places all outputs in a three-state mode to fa-
cilitate board test and debug.
Additionally, the Am386SXLV microprocessor comes
with System Management Mode (SMM) for system and
power management. SMI (System Management Inter-
rupt) is a non-maskable, higher priority interrupt than
NMI and has its own code space (1 Mbyte in Real
Mode and 16 Mbyte in Protected Mode). SMI can be
– Fully compatible with all 386SX systems and
software
s System Management Mode (SMM) for system
and power management (Am386SXLV only)
– System Management Interrupt (SMI) for power
management independent of processor
operating mode and operating system
– SMI coupled with I/O instruction break feature
provides transparent power off and auto resume
of peripherals which may not be “power aware”
– SMI is non-maskable and has higher priority
than Non-Maskable Interrupt (NMI)
– Automatic save and restore of the
microprocessor state
s 100-lead Plastic Quad Flat Pack (PQFP) package
s Extended temperature version available
coupled with the I/O instruction break feature to imple-
ment transparent power management of peripherals.
SMM can be used by system designers to implement
system and power management code independent of
the operating system or the processor mode.
Since the Am386SX/SXL/SXLV microprocessors are
supported as an embedded product in the E86 family,
customers can rely on long-term supply of product, and
extended temperature products.
In addition, customers have access to the largest se-
lection of inexpensive development tools, compilers,
and chipsets. A large number of PC operating systems
and Real Time Operating Systems (RTOS) support the
Am386SX/SXL/SXLV microprocessors. This means
cheaper development costs, and improved time to mar-
ket.
The Am386SX/SXL/SXLV microprocessor is available
in a small footprint 100-pin Plastic Quad Flat Pack
(PQFP) package.
Publication# 21020 Rev: A Amendment/0
Issue Date: April 1997