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US 5,465,229 AGranted
Single in-line memory module
AssigneeSun Microsystems, Inc.
InventorsAndreas Bechtolsheim, Edward Frank, James Testa, Shawn Storm
Life of this patent
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AssigneeSun Microsystems, Inc.
InventorsAndreas Bechtolsheim, Edward Frank, James Testa, Shawn Storm
Estimating the term…
A full width single in-line memory module (SIMM) for dynamic random access memory (DRAM) memory expansions is disclosed. A printed circuit board having a multiplicity of DRAM memory elements mounted thereto is arranged in a data path having a width of 144 bits. The SIMM of the present invention further includes on-board drivers to buffer and drive signals in close proximity to the memory elements. In addition, electrically conductive traces are routed on the circuit board in such a manner to reduce loading and trace capacitance to minimize signal skew to the distributed memory elements. The SIMM further includes a high pin density dual readout connector structure receiving electrical traces from both sides of the circuit board for enhanced functionality. The SIMM is installed in complementary sockets one SIMM, at a time to provide memory expansion in full width increments. Finally, symmetrical power and ground routings to the connector structure insure that the SIMM cannot be inserted incorrectly, wherein physically reversing the SIMM in the connector slot will not reverse power the SIMM.
A single in-line memory module for memory expansion in a computer system having a memory bus with n data lines, said single in-line memory module comprising the elements of:
A single in-line memory module for memory expansion in a computer system having a memory bus with n data lines, said single in-line memory module comprising the elements of:
A single in-line memory module for memory expansion in a computer system having a memory bus with n data lines, said single in-line memory module comprising the elements of:
Dependencies are inferred from the claim text.