Aladdin Iv (M1531/M1533); M1531 - Acer 390 Series Service Manual

2.2

Aladdin IV (M1531/M1533)

The Aladdin-IV is the succeeding generation chipset of Aladdin-III from Acer Labs. It maintains the
best system architecture (two-chip solution) to achieve the best system performance with the
lowest system cost (TTL-free). The Aladdin-IV consists of two BGA chips to give the 586-class
system a complete solution with most up-to-date features and architecture for multimedia/
multithreading OS and software applications. It utilizes the modern BGA package to improve the
AC characterization, resolves system bottleneck and makes the system manufacturing easier.
2.2.1

M1531

The M1531 includes:
Higher CPU bus frequency (up to 83.3 MHz) interface for the incoming Cyrix M2 and AMD K6,
PBSRAM and Memory Cache L2 controller
Internal MESI tag bits (8K x 2) to reduce cost and enhance performance
High-performance FPM/EDO/SDRAM DRAM controller
PCI 2.1 compliant bus interface
Smart deep buffer design for CPU-to-DRAM, CPU-to-PCI, and PCI-to-DRAM to achieve the
best system performance
Highly efficient PCI fair arbiter
The most flexible 32/64-bit memory bus interface for the best DRAM upgrade ability and
ECC/parity design to enhance the system reliability
With the concurrent bus design, PCI-to-PCI access can run concurrently with CPU-to-L2 and CPU-
to-DRAM access, while PCI-to-DRAM access can run concurrently with CPU-to-L2 access. The
M1531 also supports the snoop ahead feature to achieve the PCI master full-bandwidth access
(133 MB) and provides the enhanced power management features including ACPI support,
suspend DRAM refresh, and internal chip power control to support the Microsoft's On Now
technology OS.
The M1533 offers the best power management system solution. It integrates ACPI support, deep
green function, two-channel dedicated Ultra-33 IDE master controller, two-port USB controller,
SMBus controller, and PS2 keyboard/mouse controller.
The M1543 provides the best desktop system solution. It integrates ACPI support, green function,
two-channel dedicated Ultra-33 IDE Master controller, two-port USB controller, SMBus controller,
PS/2 keyboard/mouse controller and the Super I/O (Floppy Disk Controller, two serial port/one
parallel port) support.
The Aladdin-IV gives a highly-integrated system solution and a most up-to-date architecture to
provide the best cost/performance system solution for desktop and notebook vendors.
2-20 Service Guide