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**82495XP/490XP Cache Controller / Cache RAM (for i860) 06/05/91
***Notes:...
***Info:...
***Features:...
**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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**SN74LS610/2 IBM AT: SN74LS610, SN74LS612 Memory Mappers <84
***Notes:...
***Info:
Each 'LS610 and 'LS612 memory mapper integrated circuit contains a
4-line to 16-line decoder, a 16-word by 12-bit RAM, 16 channels of
2-line to 1-line multiplexers, and other miscellaneous circuitry on a
monolithic chip. Each 'LS610 also contains 12 latches with an enable
control.
The memory mappers are designed to expand a microprocessor's memory
addressing capability by eight bits. Four bits of the memory address
bus (see System Block Diagram)[see datasheet] can be used to select
one of 16 map registers that contain 12 bits each. these 12 bits are
presented to the system memory address bus through the map output
buffers along with the unused memory address bits from the CPU.
However, addressable memory space without reloading the map registers
is the same as would be available with the memory mapper left out.
The addressable memory space is increased only by periodically
reloading the map registers from the data bus. This configuration
lends itself to memory utilization of 16 pages of 2^(n-4) registers
each without reloading (n - number of address bits available from
CPU).
These devices have four modes of operation: read, write, map, and
pass. Data may be read from or loaded into the map register selected
by the register select inputs (RS0 thru RS3) under control of R/W
whenever chip select (CS) is low. The data I/O takes place on the data
bus DO thru D7. The map operation will output the contents of the map
register selected by the map address inputs (MA0 thru MA3) when CS is
high and MM (map mode control) is low. The 'LS612 output stages are
transparent in this mode, while the 'LS610 outputs may be transparent
or latched. When CS and MM are both high (pass mode), the address bits
on MA0 thru MA3 appear at M08-MO11, respectively (assuming appropriate
latch control) with low levels in the other bit positions on the map
outputs.
***Versions:...
***Features:...
**TACT82000 3-Chip 286 [no datasheet] c89...
**TACT82411 Snake Single-Chip AT Controller c90...
**TACT82S411 Snake+ Single-Chip AT Controller [no datasheet] c91...
**TACT83000 AT 'Tiger' Chip Set (386) c89...
**TACT84500 AT Chip Set (486, EISA) [no datasheet, some info] c91...
**Other:...
*UMC...
*Unresearched:...
*VIA...
**VT82C596/A Mobile PCI Integrated Peripheral Controller <11/05/97
***Info:
The VT82C596 MPIPC (Mobile PCI Integrated Peripheral Controller) is a
high integration, high performance, power-efficient, and high
compatibility device that supports Intel and non-Intel based processor
to PCI bus bridge functionality to make a complete Microsoft
PC97-compliant PCI/ISA system. In addition to complete ISA extension
bus functionality, the VT82C596 includes standard intelligent
peripheral controllers:
a) Master mode enhanced IDE controller with dual channel DMA engine
and interlaced dual channel commands. Dedicated FIFO coupled with
scatter and gather master mode operation allows high performance
transfers between PCI and IDE devices. In addition to standard PIO and
DMA mode operation, the VT82C596 also supports the UltraDMA-33
standard to allow reliable data transfer rates up to 33MB/sec
throughput. The IDE controller is SFF-8038i v1.0 and Microsoft
Windows- 95 compliant.
b) Universal Serial Bus controller that is USB v1.0 and Universal HCI
v1.1 compliant. The VT82C596 includes the root hub with two function
ports with integrated physical layer transceivers. The USB controller
allows hot plug and play and isochronous peripherals to be inserted
into the system with universal driver support. The controller also
implements legacy keyboard and mouse support so that legacy software
can run transparently in a non-USB-aware operating system environment.
c) Keyboard controller with PS2 mouse support.
d) Real Time Clock with 256 byte extended CMOS. In addition to the
standard ISA RTC functionality, the integrated RTC also includes the
date alarm, century field, and other enhancements for compatibility
with the ACPI standard.
e) Notebook-class power management functionality compliant with ACPI
and legacy APM requirements. Multiple sleep states (power-on suspend,
suspend-to-DRAM, and suspend-to-Disk) are supported with hardware
automatic wake-up. Additional functionality includes event
monitoring, CPU clock throttling and stop (Intel processor protocol),
PCI bus clock stop control, modular power, clock and leakage control,
hardware-based and software-based event handling, general purpose I/O,
chip select and external SMI.
f) Full System Management Bus (SMBus) interface.
g) Distributed DMA capability for support of ISA legacy DMA over the
PCI bus. PC/PCI and Serial IRQ mechanisms are also supported for
docking and non-docking applications.
h) Plug and Play controller that allows complete steerability of all
PCI interrupts to any interrupt channel. Three additional steerable
interrupt channels are provided to allow plug and play and
reconfigurability of on-board peripherals for Windows 95 compliance.
i) External IOAPIC interface for Intel-compliant symmetrical multi-
processor systems.
The VT82C596 also enhances the functionality of the standard ISA
peripherals. The integrated interrupt controller supports both edge
and level triggered interrupts channel by channel. The integrated DMA
controller supports type F DMA in addition to standard ISA DMA
modes. Compliant with the PCI-2.1 specification, the VT82C596 supports
delayed transactions so that slower ISA peripherals do not block the
traffic of the PCI bus. Special circuitry is built in to allow
concurrent operation without causing dead lock even in a PCI-to-PCI
bridge environment. The chip also includes eight levels (doublewords)
of line buffers from the PCI bus to the ISA bus to further enhance
overall system performance.
***Versions:...
***Features:...
**VT82C686A/B PCI Super-I/O Integrated Peripheral Ctrl. <02/10/98...
**Later P-Pro/II/III/Celeron...
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