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Using Pericom's PI5C16292 bus switch for memory switching

Posted: 29 Nov 2000     Print Version  Bookmark and Share

Keywords:PI5C16292 

Inhigh-endPCandserverapplications,thePentiumIITM processor runs at bus speeds of 100 MHz and beyond. These applications require bus switches to manage 100 MHz SDRAM modules with densities of 128MBs and higher.

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129 1/11/99 Using Pericom's PI5C16292 Bus Switch for Memory Switching 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Highlights Inhigh-endPCandserverapplications,thePentiumIITM processor runs at bus speeds of 100 MHz and beyond. These applications require bus switches to manage 100 MHz SDRAM modules with densities of 128MBs and higher. Pericom's PI5C16292 and PI5C162292 are 12-bit-to-24-bit Mux/ Demux bus switches designed with near zero delay, low RON (On-Resistance) of five ohms and ultra-low quiescent power. In addition,toreducenoiseresultingfromreflection,thePI5C162292 device has a built-in 25-ohm series resistor that eliminates the external series termination. For reliability, the unused module data pins should be connected toground.Figure1showstheapplicationof Pericom'sPI5C16292/ Application Brief 18 Figure 1. PI5C16292 used in Memory Module Switching By Akesh Bhojak March 27, 1998 PI5C162292 bus switch in a Intel Pentium II system with bus speeds of 100 MHz and 100 MHz SDRAM DIMMs. To prevent overloading, a bus switch is required where more than three SDRAM DIMMs are connected to the bus. The block diagram shows that the first two module's data pins are connected directly whereas the other two are connected through the bus switch and controlled by the core logic. The PI5C16292, as shown in Figure 2, has an internal 500-ohm resistor on the A2 port that is connected to ground. This A2 port connects with the unused module data pins to keep them from floating. Termination of the unused DIMM module ensures its reliability. Bus Switch 24:12 PI5C16292/PI5C162292 Address Line Intel Pentium II Processor Data Line, 72bits Control Signal Data Line, 72bits Data Line, 72bits Control Signals Core Logic (B3) 100MHz SDRAM Module (B2) 100MHz SDRAM Module (B1) 100MHz SDRAM Module (B0) 100MHz SDRAM Module 130 1/11/99 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Application Brief 18 Pericom Semiconductor Corporation 2380 Bering Drive 7 San Jose, CA 95131 7 1-800-435-2336 7 Fax (408) 435-1100 7 http://www.pericom.com The PI5C16292 has an internal 500-ohm resistor connected to ground on the A2 port. Figure 3 shows that you can use the PI5C16212 in the same application but it needs external resistor packstohandlethefloatingpinsoftheunusedmodule.Incompari- son, the PI5C16292 is a more cost-effective solution for memory module switching applications. Figure 2. PI5C16292 Block Diagram Figure 3. PI5C16292 vs. PI5C16212 Pericom has recently introduced several bus switch products for the computer, networking and multi-media markets with configu- ration up to 32 bits. It should be noted that ultra-low quiescent power (0.25A typically) makes these products ideally suited for notebook application. For detail information of the products, refer to the Pericom's web site at www.pericom.com. PI5C16212 PI5C16212 PI5C16212 PI5C16212 PI5C16212 PI5C16212 PI5C16292 PI5C16292 PI5C16292 PI5C16292 PI5C16292 PI5C16292 Using PI5C16292 Using PI5C16212 500 8 Resistor SIPs




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