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**82489DX Advanced Programmable Interrupt Controller 10/12/92
***Notes:...
***Info:...
***Versions:...
***Features:...
**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...
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**82C556M/7M/8E Viper-N+ Viper Notebook Chipset c:96
***Notes:...
***Info:...
***Configurations:...
***Features:...
**82C566/7/8 Viper-Max Chipset Scalable MultiMedia PC Solution ?...
**82C571/572 486/Pentium c:93...
**82C576/7/8 Viper Xpress [no datasheet] ?...
**82C576/8/9 Viper XPress+ [no datasheet, some info] <01/16/97...
**82C596/597 PTMAWB Pentium Adaptive Write-back (Cobra) c:93...
**82C650/1/2 Discovery (Pentium Pro) [no datasheet] ?...
**82C681/2/6/7 386/486WB EISA c:92...
**82C683 386/486AWB EISA [no datasheet] ?...
**82C693/6/7 Pentium uP Write Back Cache EISA c:93...
**82C700 FireStar c:97...
**82C701 FireStar Plus c:97...
**82C750 Vendetta [no datasheet] ?...
**82c801 SCWB2 DX Single Chip Solution c:92...
**82C802 SCWB2 PC/AT Single Chip [no datasheet] ?
***Notes:...
**82C802G/GP System/Power Management Controller (cached) c:93...
**82C895 System/Power Management Controller (cached) c:Sep94...
**82C898 System/Power Management Controller (non-cache)c:Nov94...
**
**Support Chips:
**82C601/2 Buffer Devices <Nov94...
**82C822 PCIB (VLB-to-PCI bridge) c:94...
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**SL82C490 'Wagner' 486? [no datasheet] ?
***Notes:...
**SL82C550 'Rossini' Pentium [no datasheet] c:95...
**
**Support Chips:
**SL82C365 Cache Controller (for 386DX/SX) c:91...
**SL82C465 Cache Controller (for 486/386DX/SX) c:91
***Info:
The SL82C465 cache controller supports both 1X and 2X clock modes. The
1X clock mode means that the CCLK2 signal is used as the CPU clock;
the 2X clock mode means that the PCLK signal (half the frequency and
the phase indicator of CCLK2) is used as the CPU clock. The SL82C465
and other CPU local bus devices run at the same clock frequency as the
CPU, while the rest of the system runs at the frequency of PCLK. In
other words, the operating frequency of the system logic is either the
same (2X clock mode) or half the speed of the CPU (1X clock mode). For
the 1X clock mode, the timing of the signals between the CPU/Cache and
the system logic interface is converted by the SL82C465 automatically
to satisfy the requirement of individual clocks. Table 1-1 [see
datasheet] lists the operating frequencies of the CPU local bus and
the system logic with the oscillator used.
The 2X clock mode is recommended for a CPU frequency no faster than
33Mhz because the system logic is available at the targeted speed and
the performance is slightly better than if 1X clock mode were
used. For a CPU frequency faster than 33Mhz, the 1X clock mode is
preferred for 486 systems because it becomes increasingly more
difficult to build a reliable system with an oscillator faster than
66Mhz.
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