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**82496/491 Cache Controller / Cache RAM (for P5 Pentium) 03/22/93
***Notes:
Date source: TimelineDateSort7_05.pdf
Information taken from:
1995_Intel_Pentium_Processors_and_Related_Components.pdf*
8249x Cache controllers.pdf**
>* Datasheet dated Oct'93
>** Datasheet undated, whole document dated '95
The info and features section have been solely sourced from the first
source. The second source provides far more detail. Additional
information in the configurations section has been sourced from the
second.
This chip was used on the Pentium 66MHz CPU complexes of Intel's
Xpress platform. Specifically the BXCPUPENT66 (Single 66MHz, eight
82491s) and BXCPU2XPENT (Dual 66 MHz, eight 82491s). Also found on P5
60/66MHz CPU complexes of IBM 9595/PC Server 300/500 systems.
***Info:...
***Configurations:...
***Features:...
**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...
**800 series...
*Headland/G2...
**HT12/+/A Single 286 AT Chip with EMS support c:Aug90
***Info:...
***Configurations:...
***Features:...
**HT18 80386SX Single Chip c:Sep91...
**HT21 386SX/286 Single Chip (20 MHz) c:Aug91...
**HT22 386SX/286 Single Chip (25 MHz) c:Sep91...
**HT25 3-volt Core Logic for 386SX c:Dec92...
**HT35 Single-Chip Peripheral Controller [partial info] ?...
**HTK320 386DX Chip Set c:Sep91...
**HTK340 "Shasta" 486 Chip Set c:Jun92...
**Support Chips:
**HT44 Secondary Cache c:Jun92...
**Other:...
*HMC (Hulon Microelectronics)...
*Logicstar...
*Motorola...
*OPTi...
*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
*SIS...
**5591/5592/5595 (David) Pentium PCI A.G.P. Chipset <01/09/98
***Info:...
***Configurations:...
***Features:
o Support Intel/AMD/Cyrix Pentium CPU and Other Compatible CPU
Host Bus at 60/66 MHz and 3.3V Bus Interface
− Support the Pipelined Address of Pentium compatible CPU
− Support the Linear Address Mode of Cyrix CPU
o Support the Pipelined Address Mode of Pentium CPU
o Fully Compliant to A.G.P. Revision 1.0 Specification
o Meet PC97 Requirements
o Supports PCI Revision 2.1 Specification
o Integrated Second Level (L2) Cache Controller
- Write Back Cache Mode
- Support L2 Cache Flushing for entire L2 cache or specific
4K page
- 8 bits or 7 bits Tag with Direct Mapped Cache Organization
- Integrated 32K bits Dirty SRAM
- Integrated 32K bits Invalid SRAM
- Support Pipelined Burst SRAM
- Support 256K/512K/1MBytes Cache Sizes
- Cache Hit Read/Write Cycle of 3-1-1-1
- Cache Back-to-Back Read/Write Cycle of 3-1-1-1-1-1-1-1
- Support Single Read Allocation for L2 Cache
- Support Concurrency of CPU to L2 cache and A.G.P. master to
DRAM accesses
o Integrated DRAM Controller
- Support 6 RAS Lines for FPM/EDO/SDRAM DIMMs/SIMMs
- Support 2Mbytes to 768Mbytes of main memory
- Support Cacheable DRAM Sizes up to 256 MBytes.
- Support 256K/512K/1M/2M/4M/8M/16Mx N FPM/EDO/SDRAM DRAM
- Support 64 Mb DRAM Technology
- Support Parity Checker or ECC Function
- Support 3.3V or 5V DRAM
- Supports Symmetrical and Asymmetrical DRAM
- Support Concurrent Write Back
- Support CAS before RAS Refresh, Self Refresh
- Support Relocation of System Management Memory
- Programmable CAS#, RAS#, RAMWE# and MA Driving Current
- Fully Configurable for the Characteristic of Shadow RAM (640
KBytes to 1 MBytes)
- Support FPM DRAM 5/6-3-3-3(-3-3-3-3) Burst Read Cycles
- Support EDO DRAM 5/6-2-2-2(-2-2-2-2) Burst Read Cycles
- Support SDRAM 5/6/7-1-1-1(-2/3-1-1-1) Burst Read Cycles
- Support X-1-1-1/X-2-2-2/X-3-3-3 Burst Write Cycles
- Two Programmable Non-cacheable Regions
- Option to Disable Local Memory in Non-cacheable Regions
- Shadow RAM in Increments of 16 Kbytes
- Pseudo Directory/Page Scheme for Mapping Graphical Texture
Access to Physical Memory Address
- Built-in 8 Way Associative/16 Entries GART cache to Minimize the
Number of Memory Bus Cycles Required for Accessing Graphical
Texture Memory
- Programmable Counters to Ensure Guaranteed Minimum Access Time
for A.G.P., CPU, and PCI accesses
o Provides High Performance PCI Arbiter.
- Support up to 5 PCI Masters
- Support Rotating Priority Mechanism
- Hidden Arbitration Scheme Minimizes Arbitration Overhead.
- Support Concurrency between CPU to Memory and PCI to PCI
- Support Concurrency between CPU to 33Mhz PCI Access and 33Mhz
PCI to A.G.P. Access
- Support Concurrency between CPU to 66Mhz PCI Access and A.G.P.
to 33Mhz PCI Access
- Programmable Timers Ensure Guaranteed Minimum Access Time for
PCI Bus Masters, and CPU
o Integrated Host-to-PCI Bridge
- Support Asynchronous and Synchronous PCI Clock
- Translates the CPU Cycles into the PCI Bus Cycles
- Zero Wait State Burst Cycles
- Support IDE Posted Write
- Support Pipelined Process in CPU-to-PCI Access
- Support Advance Snooping for PCI Master Bursting
- Maximum PCI Burst Transfer from 256 Bytes to 4 Kbytes
- Support Memory Remapping Function for PCI master accessing
Graphical Window
o Integrated A.G.P. Compliant Target/66Mhz Host-to-PCI Bridge
- Support Asynchronous and Synchronous A.G.P. Clock
- Support 1X, and 2X Mode for A.G.P. 66/133 MHz 3.3V device
- Support Graphic Window Size from 4Mbytes to 256Mbytes
- Different arbitration policy for A.G.P. devices and 66Mhz PCI
devices.
- Translates Sequential CPU-to-A.G.P. Memory Write Cycles into
A.G.P. Bus (PCI66) Burst Cycles
- Zero Wait State Burst Cycles
- Support Pipelined Process in CPU-to-A.G.P. Access
- Support Advance Snooping for A.G.P. Master initiate system
memory access with PCI Cycles
- Support 8 Way, 16 Entries Page Table Cache to enhance A.G.P.
Read/Write Performance
- Support Both 1-Level and 2-Level GART (Graphic Address Re-
Mapping Table)
- Maximum PCI Burst Transfer from 256 Bytes to 4 Kbytes
- Programmable Counters to Ensure Guaranteed Minimum Access Time
for Low Priority Request, CPU to A.G.P./and A.G.P. Master
Transaction
- Support PCI-to-PCI bridge function for memory write from 33Mhz
PCI bus to A.G.P. bus
o Integrated Posted Write Buffers and Read Prefetch Buffers to
Increase System Performance
- CPU-to-Memory Posted Write Buffer (CTMFF) with 8 QW Deep, Always
Sustains 0 Wait Performance on CPU-to-Memory
- CPU-to-Memory Read Buffer with 4 QW Deep
- CPU-to-PCI Posted Write Buffer(CTPFF) with 8 DW Deep
- PCI-to-Memory Posted Write Buffer(PTHFF) with 8 QW Deep, Always
Streams 0 Wait Performance on PCI-to/from-Memory Access
- PCI-to-Memory Read Prefetch Buffer(CTPFF) with 8 QW Deep
- CPU-to-PCI66 Posted Write Buffer(CTAFF) with 8 DW Deep
- PCI66-to-Memory Posted Write Buffer(ATHFF) with 8 QW Deep
- A.G.P. Request Queue With the Depth of 32
- A.G.P. High Priority Write Queue with 64 QW Deep
- A.G.P. Low Priority Write Queue with 64 QW Deep
- A.G.P. High Priority Read Return Queue with 64 QW Deep
- A.G.P. Low Priority Read Return Queue with 64 QW Deep
o Fast PCI IDE Master/Slave Controller
- Bus Master Programming Interface for ATA Windows 95 Compliant
Controller
- Plug and Play Compatible
- Support Scatter and Gather
- Support Dual Mode Operation - Native Mode and Compatibility
Mode
- Support IDE PIO Timing Mode 0, 1, 2 ,3 and 4
- Support Multiword DMA Mode 0, 1, 2
- Support Ultra DMA/33
- Two Separate IDE Bus
- Two 16 DW FIFO for PCI Burst Transfers.
o Support NAND Tree for Ball Connectivity Testing
o 553-Balls BGA Package
o 0.35μm 3.3V CMOS Technology
**5596/5513 (Genesis) Pentium PCI Chipset <03/26/96...
**5597/5598 (Jedi) Pentium PCI/ISA Chipset <04/15/97...
**530/5595 (Sinbad) Host, PCI, 3D Graphics & Mem. Ctrl.<11/10/98...
**540 (Spartan) Super7 2D/3D Ultra-AGP Single C.S.<11/30/99...
**55x SoC (System-on-chip) <03/14/02...
**
**Support chips:
**85C206 Integrated Peripheral Controller [no datasheet] ?...
**5595 Pentium PCI System I/O <12/24/97...
**950 LPC I/O <07/16/99...
**Other:...
**PII/III/Pro...
**Athlon etc...
*Symphony...
*TI (Texas Instruments)...
*UMC...
*Unresearched:...
*VIA...
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*Western Digital...
*Winbond...
*ZyMOS...
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