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US 5,347,641 AGranted
Page register with a don't care function
AssigneeWaferScale Integration, Inc.
InventorsYoram Cedar, Arye Ziklik, Alex Shubat
Life of this patent
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Abstract
Page logic, which is coupled to a programmable array decoder, allows for expansion of memory address space depending on the number of bits in a page register. The programmable array decoder has a "don't care" function which allows the user to be independent of the page mode.
Claims15
Structure in a programmable system device for providing a page mode comprising:
- means for programmably selecting devices, said means for programmably selecting having input lines for accepting signals which indentify devices and output lines for carrying signals which enable devices;
- means for selectively latching and transferring data signals to a first plurality of said input lines, said data signals indicating said page mode;
- and
- means for providing address signals to a second plurality of said input lines,
- wherein one of said output lines is coupled to said means for selectively latching and transferring data and wherein said one of said output lines carries a signal which enables reading from and writing to said means for selectively latching and transferring data in response to said address signals indicating an address corresponding to said means for selectively latching and transferring data,
- whereby said means for programmably selecting provides said structure with a "don't care" function which enables reading from and writing to said means for selectively latching and transferring data, regardless of said data signals.
3 more elements
A structure in a programmable system device for expansion of memory access and providing a page mode comprising:
- a programmable array decoder having a plurality of output lines for enabling devices and a first and a second plurality of input lines for accepting signals which identify devices;
- means for selectively latching and transferring data signals to said first plurality input lines, said data signals indicating said page mode;
- and
- means for providing address signals to said second plurality of input lines,
- wherein said programmable arrange decoder is programmed so that both said data signals and said address signals determine whether an enabling signal is provided for a first device and said address signals alone determine whether an enabling signal is provided for a second device,
- whereby said programmable array decoder has a "don't care" function such that said second device is selected independent of said page mode.
3 more elements
Dependencies are inferred from the claim text.