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*_IBM...
*ACC Micro...
**ACC2016 Buffer and MUX Logic c96
***Info:
The ACC Micro 2016 is designed to work together with the system core
logic products to provide the decoding logic for the Real Time Clock
(RTC), address buffer, and data buffer for the 486/386DX and Pentium
applications. At least seven TTLs can be saved when using the 2016.
The 2016 can be used with either the 2268/2178/2168/2056/2057/
2066/2048 system logic or the 2086/2087/2089 super chip. The 2016 is
based on the condition of the /ROMCS signal to determine which system
logic to work with. During power up, if the /ROMCS is pulled high, it
works with the 2268/2178/2168/2056/2057/2066/2048 system logic. If
/ROMCS is pulled low, it works with the 2086/2087/2089 super chip. The
/RTCDS signal (pin 97) requires a pull low through a damping register
for all system logic applications.
***Versions:...
***Features:...
**ACC2020 Power Management Chip c92...
**ACC5500 Multifunction I/O Control Chip for PS2 Model 50/60 c88...
**
**Other chips...
*ALD...
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*AMD . . . . . . . [no datasheets, some info]...
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*Contaq . . . . . [no datasheets, some info]...
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*Forex . . . . . . [List only, no datasheets found]...
*Intel...
**82395SX Smart Cache 12/17/90
***Notes:...
**82396SX Smart Cache 12/17/90...
**82485 Turbo Cache (and 485Turbocache) c90...
**82489DX Advanced Programmable Interrupt Controller 10/12/92...
**82495DX/490DX DX CPU-Cache Chip Set <Sep91...
**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...
**800 series...
*Headland/G2...
**HT44 Secondary Cache c:Jun92
***Info:
The HT44 is a look-aside write-through, 80486SX, 486DX or 486DX2
secondary cache controller. It is packaged in an inexpensive 84-pin
plastic-leaded chip carrier (PLCC).
Architecture
With its look-aside architecture, the HT44 fits beside the CPU-to-
Memory bus and not in the data path. Therefore, once the HT44 has
been designed into a 486 system, it can be populated for secondary
cache systems or left vacant for non-secondary cache systems. The HT44
is direct-mapped to the available address space.
Performance
The HT44 has a number of performance enhancing features. These
include zero-waitstate burst line fills to the 486 on secondary cache
hits, and simultaneous 486 and secondary cache updates on read misses.
Memory Configurations
The HT44 supports cache sizes from 32KBytes to 1MB. Both synchronous
and asynchronous SRAMs are supported. 25ns SRAMs are sufficient for
zero-wait-state operation at 33MHz.
Chip Set Support
The HT44 can, be implemented with minimal glue logic in a 486 system
with the HTK340 (code name Shasta) chip set. The registers in the
HTK340 allow for programming of non-cacheable and write-protected
areas of memory. The HTK340 will support the HT44 with synchronous
SRAMs only. Future Headland chip sets will support both synchronous
and asynchronous SRAM designs.
The HT44 can also be used with some third-party chip sets, however,
additional glue logic may be required.
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