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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):
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**????? (Profusion) c:99...
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**85C206 Integrated Peripheral Controller [no datasheet] ?
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**5595 Pentium PCI System I/O <12/24/97...
**950 LPC I/O <07/16/99...
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*VIA...
**VT82C590 Apollo VP2, VP2/97, Single-Chip Pentium 66MHz <01/10/97
***Info:
The VT82C590 Apollo-VP2 is a high performance, cost-effective and
energy efficient chip set for the implementation of PCI/ISA desktop
and notebook personal computer systems based on the 64-bit
Pentium/AMD5K86/AMD6K86/Cyrix6X86 super-scalar processors.
The Apollo-VP2 chip set consists of the VT82C595 system controller
(328 pin BGA) and the VT82C586B PCI to ISA bridge (208 pin PQFP). The
VT82C595 system controller provides superior performance between the
CPU, optional synchronous cache, DRAM and the PCI bus with pipelined,
burst and concurrent operation. For pipelined burst synchronous SRAMs,
3-1-1-1-1-1-1-1 timing can be achieved for both read and write
transactions at 66 Mhz. Four cache lines (16 quadwords) of CPU/cache
to DRAM write buffers with concurrent write-back capability are
included in the chip to speed up the cache read and write miss cycles.
The VT82C595 supports six banks of DRAMs up to 512KB. The DRAM
controller supports Standard Page Mode DRAM, EDO DRAM and Synchronous
DRAM in a flexible mix / match manner. The Synchronous DRAM interface
allows zero wait state bursting between the DRAM and the data buffers
at 66Mhz. The six banks of DRAM can be composed of an arbitrary
mixture of 1M / 2M / 4M / 8M / 16MxN DRAMs. Each bank may be populated
with either 32bit or 64bit data width. The DRAM controller also
supports optional ECC (single-bit error correction and multi-bit
detection) capability.
The VT82C595 supports 3.3 / 5V 32-bit PCI bus with 64-bit to 32-bit
data conversion. Five levels (doublewords) of post write buffers are
included to allow for concurrent CPU and PCI operation. Consecutive
CPU addresses are converted into burst PCI cycles with byte merging
capability for optimal CPU to PCI throughput. For PCI master
operation, forty-eight levels (doublewords) of post write buffers and
sixteen levels (doublewords) of prefetch buffers are included for
concurrent PCI bus and DRAM/cache accesses. The chipset also supports
enhanced PCI bus commands such as Memory-Read-Line, Memory-Read-
Multiple and Memory-Write-Invalid commands to minimize snoop
overhead. In addition, the chipset supports advanced features such as
snoop ahead, snoop filtering, L1 write-back forward to PCI master and
L1 write-back merged with PCI post write buffers to minimize PCI
master read latency and DRAM utilization. The VT82C586B PCI to ISA
bridge supports four levels (doublewords) of line buffers, type F DMA
transfers and delay transaction to allow efficient PCI bus utilization
and (PCI-2.1 compliant). The VT82C586B also includes an integrated
keyboard controller with PS2 mouse support, integrated DS12885 style
real time clock with extended 256 byte CMOS RAM, integrated master
mode enhanced IDE controller with full scatter and gather capability
and extension to UltraDMA-33 / ATA-33 for 33MB/sec transfer rate,
integrated USB interface with root hub and two function ports with
built-in physical layer transceivers, Distributed DMA support, and
OnNow / ACPI compliant advanced configuration and power management
interface. A complete main board can be implemented with only six
TTLs.
The VT82C590 chipset is ideal for high performance, high quality, high
energy efficient and high integration desktop and notebook PCI/ISA
computer systems.
***Configurations:...
***Features:
o PCI/ISA Green PC Ready
- Supports 3.3V or 5V interface to CPU, system memory, and / or
PCI bus
- Supports CPUs with internal voltages below 3.3V
- PC-97 compatible using VT82C586B South Bridge with ACPI Power
Management
o High Integration
- Single chip implementation for 64-bit Pentium-CPU, 64-bit system
memory, and 32-bit PCI interface
- VT82C590 Apollo VP2 Chipset: VT82C595 system controller and
VT82C586B PCI to ISA bridge
- Chipset includes UltraDMA-33 EIDE, USB, and Keyboard / PS2-Mouse
Interfaces plus RTC / CMOS on chip
- Six TTLs for a complete main board implementation
o Flexible CPU Interface
- Supports 64-bit Pentium, AMD 5k86 , AMD 6k86 and Cyrix 6x86 CPUs
- CPU external bus speed up to 66 Mhz (internal 200Mhz and above)
- Supports CPU internal write-back cache
- System management interrupt, memory remap and STPCLK mechanism
- Cyrix 6X86 linear burst support
- CPU NA# / Address pipeline capability
o Advanced Cache Controller
- Direct map write back or write through secondary cache
- Pipelined burst synchronous SRAM (PBSRAM) cache support (with
global write enable feature)
- Flexible cache size: 0K/256K/512K/1M/2MB
- 32 byte line size to match the primary cache
- Integrated 10-bit tag comparator
- 3-1-1-1 read/write timing for PBSRAM access at 66 Mhz
- 3-1-1-1-1-1-1-1 back to back read timing for PBSRAM access at
66 Mhz
- Sustained 3 cycle write access for PBSRAM access or CPU to DRAM
and PCI bus post write buffers at 66 Mhz
- Data streaming for simultaneous primary and secondary cache
line fill
- System and video BIOS cacheable and write-protect
- Programmable cacheable region and cache timing
o Fast DRAM Controller
- Fast Page Mode/EDO/Synchronous-DRAM support in a mixed
combination
- Mixed 1M/2M/4M/8M/16MxN DRAMs
- 6 banks up to 512MB DRAMs
- Flexible row and column addresses
- 64-bit or 32-bit data width in arbitrary mixed combination
- 3.3v and 5v DRAM without external buffers
- Optional bank-by-bank ECC (single-bit error correction and
multi-bit error detection) for DRAM integrity
- Two-bank interleaving for 16Mbit SDRAM support
- Two-bank and four bank interleaving for 64Mbit SDRAM support
(14 MA lines)
- Four cache lines (16 quadwords) of CPU/cache to DRAM write
buffers
- Concurrent DRAM writeback
- Speculative DRAM access
- Read around write capability for non-stalled CPU read
- Burst read and write operation
- 4-2-2-2 on page, 7-2-2-2 start page and 9-2-2-2 off page timing
for EDO DRAMs at 50/60 MHz
- 5-2-2-2 on page, 8-2-2-2 start page and 11-2-2-2 off page timing
for EDO DRAMs at 66 MHz
- 6-1-1-1 on page, 8-1-1-1 start page and 10-1-1-1 off page for
SDRAMs at 66 MHz
- 5-2-2-2-3-1-2-2 back-to-back access for EDO DRAM at 66 MHz
- 6-1-1-1-3-1-1-1 back-to-back access for SDRAM at 66 MHz
- BIOS shadow at 16KB increment
- Decoupled and burst DRAM refresh with staggered RAS timing
- Programmable refresh rate, CAS-before-RAS refresh and refresh
on populated banks only
o Intelligent PCI Bus Controller
- 32 bit 3.3/5v PCI interface
- Synchronous divide-by-two PCI bus interface
- PCI master snoop ahead and snoop filtering
- PCI master peer concurrency
- Synchronous bus to CPU clock with divide-by-two from the CPU
clock
- Automatic detection of data streaming burst cycles from CPU to
the PCI bus
- Five levels (double-words) of CPU to PCI posted write buffers
- Byte merging in the write buffers to reduce the number of PCI
cycles and to create further PCI bursting possibilities
- Zero wait state PCI master and slave burst transfer rate
- PCI to system memory data streaming up to 132Mbyte/sec
- Forty-eight levels (double-words) of post write buffers from PCI
masters to DRAM
- Sixteen levels (double-words) of prefetch buffers from DRAM for
access by PCI masters
- Enhanced PCI command optimization (MRL, MRM, MWI, etc.)
- Complete steerable PCI interrupts
- Supports L1 write-back forward to PCI master read to minimize
PCI read latency
- Supports L1 write-back merged with PCI master post-write to
minimize DRAM utilization
- Provides transaction timer to fairly arbitrate between PCI
masters
- PCI-2.1 compliant
o Built-in nand-tree pin scan test capability
o 0.6um mixed voltage, high speed / low power CMOS process
o 328 pin Low-Profile BGA Package
**VT82C597/AT Apollo VP3, Single-Chip for Pentium with AGP <10/03/97...
**VT82C598MVP Apollo MVP3,Single-Chip 66/75/83/100MHz & AGP <09/22/97...
**VT8501 Apollo MVP4,Single-Chip 66-100MHz & AGP <11/04/98...
**VT82C680 Apollo P6, Pentium-Pro Chip Set <08/30/96...
**Support chips:
**VT82C505 Pentium/486 VL to PCI Bridge <05/30/94...
**VT82C586/A/B PCI Integrated Peripheral Controller <10/13/96...
**VT82C596/A Mobile PCI Integrated Peripheral Controller <11/05/97...
**VT82C686A/B PCI Super-I/O Integrated Peripheral Ctrl. <02/10/98...
**Later P-Pro/II/III/Celeron...
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