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**M1531/33/43    Aladdin IV & IV+  50-83.3MHz                <05/28/97
***Info:
****M1531 CPU-to-PCI bridge, Memory, Cache and Buffer Controller:...
****M1533 PCI-to-ISA Bus Bridge:
The M1533 is a bridge between  PCI and ISA bus, providing full PCI and
ISA compatible functions. The  M1533 has Integrated System Peripherals
(ISP) (2 x  82C59 and Serial interrupt, 1  x 82C54), advanced features
(Type F  and Distributed DMA) in  the DMA controller (2  X 82C37), PS2
Keyboard/Mouse controller,  2-channel dedicated IDE  Master Controller
with  Ultra-33  specification,  System  Management Bus  (SMB),  and  2
OpenHCI  1.0a USB ports.  The ACPI  (Advanced Configuration  and Power
Interface)  and  PCI  2.1  (Delayed  Transaction  &  Passive  Release)
specification  have  also been  implemented.   Furthermore, this  chip
supports  the   Advanced  Programmable  Interrupt   Controller  (APIC)
interface for Multiple-Processors system. M1533 also supports the deep
flexible green  function and provides  the best solution for  the best
green  system.  It  can  connect  to  the  ALi  Pentium  North  Bridge
(M1521/M1531/M1541) and also the  ALi Pentium Pro North Bridge (M1615)
to provide the best system solution.

One  eight-byte bi-directional  line  buffer is  provided for  ISA/DMA
Master  memory read/writes.  One 32-bit  wide posted  write  buffer is
provided for  PCI memory write &  I/O write (for Audio)  cycles to the
ISA bus.  Provides a PCI to ISA  IRQ routing table, and  level to edge
trigger transfer.

The chip provides 2 extra IRQ lines and 1 programmable chip select for
motherboard Plug-and-Play functions. The interrupt lines can be routed
to any of the available ISA interrupts.

The on-chip IDE controller supports two separate IDE connectors for up
to 4  IDE devices  providing an  interface for IDE  hard disks  and CD
ROMs. The  Ultra 33  specification (which supports  the 33M  bytes per
second transfer rate) has been implemented at this IDE controller. The
ATA  bus pins  & the  Buffer  (Read Ahead  and Posted  Write) are  all
dedicated  for separate  channel  to improve  the  performance of  IDE
Master.

The M1533 supports Super Green function for Intel and Intel compatible
CPUs. It implements  SMI or SCI (System Controller  Interrupt) to meet
the ACPI specification. It also meets the requirement for OnNow Design
Initiative.  The M1533  supports powerful  power management  for power
saving  including  On,  Standby,  Sleeping,  SoftOff,  Mechanical  Off
State. To  control the  CPU power consumption,  it provides  CPU clock
control (STPCLKJ). The STPCLKJ can  be active (low) or inactive (high)
in turn  by throttling control. Also,  the M1533 can  support the most
flexible system  clock design:  it can be  programmed to stop  the CPU
Clock,  PCI   Clock,  the   Clock  cell,  or   to  reduce   the  Clock
frequency.  The  PBSRAM  (Pipelined  Burst  SRAM) doze  mode  is  also
supported.

The M1533 is a highly integrated chip that includes PS2 Keyboard/Mouse
controller,  SMBus,  2 OpenHCI  1.0a  USB  ports,  and dedicated  GPIO
(General  Purpose  Input/Output) pins.  The  Notebook  or the  Desktop
system  designer can use  this chip  to implement  the best  green and
cost/performance system.

***Configurations:...
***Features:...
**M1541/42/33/43 Aladdin V & V+    50-100MHz                         ?...
**M1561/43/35D   Aladdin 7 ArtX    [no datasheet, some info]  11/08/99...
**M6117          386SX Single Chip PC                              <97...
**
**Support Chips:
**M1535/D        South Bridge                                        ?...
**
**May not exist:...
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*AMD . . . . . . . [no datasheets, some info]...
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**82395SX     Smart Cache                                     12/17/90
***Notes:...
**82396SX     Smart Cache                                     12/17/90
***Notes:...
***Info:...
***Versions:...
***Features:...
**82485       Turbo Cache (and 485Turbocache)                      c90...
**82489DX       Advanced Programmable Interrupt Controller    10/12/92...
**82495DX/490DX DX CPU-Cache Chip Set                           <Sep91...
**82495XP/490XP Cache Controller / Cache RAM (for i860)       06/05/91...
**82496/491     Cache Controller / Cache RAM (for P5 Pentium) 03/22/93...
**82497/492   Cache Controller / Cache RAM (for P54 Pentium)    <Nov94...
**82498/493   Cache Controller / Cache RAM (for P54 Pentium)    <Nov94...
**
**Later chipsets (basic spec):
**440 series:...
**450NX  (?)            06/29/98:...
**?????  (Profusion)    c:99...
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