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**82495DX/490DX DX CPU-Cache Chip Set                           <Sep91
***Notes:...
***Info:...
***Configurations:...
***Features:...
**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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**UM82C230     286AT MORTAR Chip Set                               <91
***Info:
The UMC's MORTAR (286AT) Chip Set UM82C230 series provides an economic
alternative for  building a reliable  IBM PC/AT compatible  system.  A
commercial  12MHZ/0   wait  state,  4MByte  main   memory  system  and
math-coprocessor  can  be easily  built  by  using  3 VLSIs,  8  logic
components plus memory and processor.

The  UM82C230 MORTAR  chipset consists  of the  UM82C231 System/Memory
Controller,  the   UM82C232  Data/Address  Buffer   and  the  UM82C206
Integrated Peripherals Controller (IPC).

As shown in the System  Block Diagram, [see datasheet] there are three
data buses: local data bus, AT  data bus and peripheral data (XD) bus.
The local DRAM, EPROM and Numerical Processor are located on the local
data bus. The UM82C206 and 8042 Keyboard Controller sit on the XD bus.
The AT data bus was driven  by the UM82C232 directly which conveys the
data to/from the AT Channel Adaptors.

The address  bus architecture is  also very simple; local  CPU address
bus, local DRAM  address bus (MA), peripheral address  bus (XA) and AT
address bus. The local address bus is shared between CPU, UM82C231 and
UM82C206.  The MA bus  is used  by the  local DRAM  only. Most  of the
system  board devices  are  attached  to the  XA  bus, like  UM82C232,
UM82C206,  ROMs and  8042. Some  AT address  lines are  driven  by the
UM82C231 or UM82C232 directly; the others are buffered.

The  UM82C231 provides  synchronization  and control  signals for  all
buses.  The UM82C231 also distinguishes  if the current cycle is local
memory cycle.   Upon detecting that  it is a  local DRAM cycle,  no AT
control signals are sent out to  the AT channel. The UM82C231 is based
on  the  memory configurations  to  complete  the  current cycle  with
fastest response. If the cycle is AT cycle, the UM82C231 sends out the
control signals  sequentially which are  then used by the  adaptors or
system board devices to receive the  write data or to send the fetched
data. Then, depending on the  status signals sent back by the adaptors
or  system board  devices, the  UM82C231 determines  which kind  of AT
cycles to  perform: 8-bit, 16-bit, bus conversion,  wait state insert,
or wait state cycle.

The UM82C232  Data/Address buffer provides the  buffering and latching
between the  CPU local  data bus, AT  bus and  XD bus. The  parity bit
generation and parity bit checking logic resides in the UM82C232 also.
During DMA cycles, the UM82C232  latches the address from XD, which is
sent by the UM82C206, and transfers to XA bus.  

***Configurations:...
***Features:...
**UM82C210     386SX/286 AT Chip Set                               <91...
**UM82C3xx     Twinstar & UM82C336F/N & UM82C39x [no datasheet]      ?...
**UM82C380     386 HEAT PC/AT Chip Set                             <91...
**UM82C480     386/486 PC Chip Set                                 c91...
**UM82C493/491 ??????????????? [no datasheet]                        ?...
**UM8498/8496  486 VL Chipset  "Super Energy Star Green"[no dsheet]c94...
**UM8881/8886  HB4 PCI Chipset "Super Energy Star Green"[no dsheet]c94...
**UM8890       Pentium chipset [no datasheet]                        ?...
**
**Support Chips:
**UM82152      Cache Controller (AUStek A38152 clone)              <91...
**UM82C852     Multi I/O For XT                                    <91...
**UM82C206     Integrated Peripheral Controller                    <91...
**UM82c45x     Serial/Parallel chips                                 ?...
**Other chips:...
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