Semiconductor memory device
First Claim
1. A semiconductor memory device incorporating an externally applied signal in synchronization with an external clock signal having first transitions, each from a first logic level to a second logic level and second transitions, each from the second logic level to the first logic level, comprising:
- an address generation circuit receiving and incorporating two or more time-division multiplexed address signals to generate internal address signals in synchronization with the external clock signal,said address generation circuit including means responsive to an access instruction signal for being activated to latch the respective time-division multiplexed address signals in synchronization with predetermined transitions of said first transitions and said second transitions of said external clock signal for generating said internal address signals.
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Accused Products
Abstract
A semiconductor memory device includes a DRAM, an SRAM and a bi-direction transfer gate circuit provided between SRAM and DRAM. SRAM array includes a plurality of sets of word lines. Each set is provided in each row of SRAM array and each word line in each set is connected to a different group of memory cells of an associated row. An address signal for the SRAM and an address signal for the DRAM are separately applied to an address buffer. The semiconductor memory device further includes an additional function control circuit for realizing a burst mode and a sleep mode. A data transfer path from DRAM to the SRAM and a data transfer path from the SRAM to the DRAM are separately provided in the bi-directional transfer gate circuit. Data writing paths and data reading paths are separately provided in the DRAM array. By the above described structure, operation of the buffer circuit is stopped in the sleep mode, reducing power consumption. Since data writing path and data reading path are separately provided in the DRAM array, addresses to the DRAM array can be applied in non-multiplexed manner, so that data can be transferred at high speed from the DRAM array to the SRAM array, enabling high speed operation even at a cache miss.
31 Citations
8 Claims
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1. A semiconductor memory device incorporating an externally applied signal in synchronization with an external clock signal having first transitions, each from a first logic level to a second logic level and second transitions, each from the second logic level to the first logic level, comprising:
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an address generation circuit receiving and incorporating two or more time-division multiplexed address signals to generate internal address signals in synchronization with the external clock signal, said address generation circuit including means responsive to an access instruction signal for being activated to latch the respective time-division multiplexed address signals in synchronization with predetermined transitions of said first transitions and said second transitions of said external clock signal for generating said internal address signals. - View Dependent Claims (2, 3, 4)
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5. A semiconductor memory device incorporating an externally applied signal in synchronization with an external clock signal having a first transition from a first logic level to a second logic level and a second transition from the second logic level to the first logic level, comprising:
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an address generation circuit receiving and incorporating two or more time-division multiplexed address signals to generate internal address signals in synchronization with the external clock signal, said address generation circuit including means responsive to an access instruction signal for being activated to latch the respective time-division multiplexed address signals in synchronization with both of said first transition and said second transition of said external clock signal for generating said internal address signals. - View Dependent Claims (6, 7, 8)
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Specification