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**82498/493 Cache Controller / Cache RAM (for P54 Pentium) <Nov94
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**
**Later chipsets (basic spec):
**440 series:...
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**HT18 80386SX Single Chip c:Sep91
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**HT35 Single-Chip Peripheral Controller [partial info] ?...
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**HT44 Secondary Cache c:Jun92...
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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:...
**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...
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