Shared Pad Semiconductor Memory Reducing Pad Count
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Solution Overview
Problem
The miniaturization of semiconductor memory apparatus is hindered by the increasing number of pads required for communication with external controllers, as the capacity of the semiconductor memory apparatus grows, leading to an expansion in occupied area.
Innovation Solution
Implementing a shared pad configuration that outputs a read operation control signal during read operations and receives a write operation control signal during write operations, along with a read data strobe generation unit and a data mask signal buffering unit to manage signals efficiently, thereby reducing the number of pads needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the capacity of the semiconductor memory apparatus is increased, then the number of pads increases, but the area occupied by the pads increases
Solution Approach 1:
The patent merges the functions of multiple pads into a single shared pad. The shared pad alternates between receiving write operation control signals and outputting read operation control signals based on the operational mode. This combining approach reduces the total number of pads required while maintaining full functionality, directly resolving the contradiction between increasing capacity (which would normally increase pad count) and minimizing occupied area.
Solution Approach 2:
The shared pad is designed with multi-functionality to serve both write operations (receiving control signals) and read operations (outputting control signals). By making the pad universal and adaptable to different operational modes through time-division multiplexing, the patent eliminates the need for separate dedicated pads for each function, thereby reducing the overall pad count and occupied area while supporting increased capacity.
2Area of stationary object
If the number of pads is reduced, then the area occupied by pads decreases, but pad utilization efficiency must be maintained
Solution Approach 1:
The shared pad employs dynamic function assignment based on operational mode. During write operations, the pad dynamically receives control signals, while during read operations, it dynamically outputs control signals. This dynamic adaptability ensures that the reduced pad count does not compromise functionality, as the shared pad efficiently switches between roles to maintain full utilization efficiency despite the reduced total number of pads.
Data Source
AI summary
A semiconductor memory apparatus includes a shared pad which is configured to output a read operation control signal in a read operation and receive a write operation control signal in a write operation.