Title :
Clocking considerations for a Pentium-based CPU module with 512K byte secondary cache
Author :
Reinschmidt, Robert M. ; Leuthold, Dale H.
Author_Institution :
MicroModule Syst., Cupertino, CA, USA
Abstract :
A method of distributing clock to and on a Pentium-based CPU module was designed and produced. Multiple clock driver outputs are connected in parallel and drive a PC board trace through a series termination resistor to the input of the module. On the module, the clock inputs to 20 dice are connected together and brought to a single PGA pin. The effect of varying termination resistance, PWB foil characteristic impedance, and foil length on the clock waveform characteristics including skew, edge rate, overshoot, and time of flight were determined
Keywords :
buffer storage; clocks; microprocessor chips; multichip modules; printed circuit design; 512 kbyte; CLK signal requirements; MCM; PC board trace; PGA pin; PWB foil characteristic impedance; Pentium-based CPU module; clock input connection; clock waveform characteristics; clocking considerations; edge rate; foil length; microprocessor system; multiple clock driver outputs; overshoot; secondary cache; series termination resistor; skew; time of flight; varying termination resistance; Cache memory; Clocks; Control systems; Delay; Electronics packaging; Frequency; Impedance; Microprocessors; Resistors; SRAM chips;
Conference_Titel :
Multi-Chip Module Conference, 1994. MCMC-94, Proceedings., 1994 IEEE
Conference_Location :
Santa Cruz, CA
Print_ISBN :
0-8186-5560-7
DOI :
10.1109/MCMC.1994.292531
