Systems and methods for memory operation using local word lines
Systems and method are provided for a memory circuit. In embodiments, the circuit includes a plurality of memory cells corresponding to a word of data and a global write word line. A plurality of local write lines are connected to a subset of the plurality of memory cells of the word of data. Selection logic is configured to activate a particular subset of memory cells for writing via a particular local write line based on a signal on the global write word line and a selection signal associated with the particular subset of memory cells.
1. A method of operating a memory circuit comprising a plurality of memory cells corresponding to a word of data, comprising:
providing a signal on a global write word line indicating data is to be written;
providing a selection signal on one of a plurality of selection lines, each selection line being associated with a subset of the plurality of memory cells;
operating selection logic to generate a signal on a local write line connected to the subset of the plurality of memory cells associated with the selection signal based on the selection signal and the global write word line signal;
writing data present on a plurality of input data pins to the subset of the plurality of memory cells based on the signal on the local write line.
2. The method of claim 1 , further comprising:
providing a signal on a write word line that is provided to all of the memory cells of the word of data.
3. The method of claim 1 , wherein the selection logic generates the signal on the local write line and a signal on a local write line bar.
4. The method of claim 3 , wherein the signals on the local write line and the local write line bar are generated using a signal NAND gate and a single inverter or a single NOR gate and a single inverter.
5. A signal network for operating a memory circuit comprising a plurality of memory cells corresponding to a word of data, comprising:
a global write word line;
a read word line configured for connection to each of the plurality of memory cells;
a plurality of selection signal lines, each selection signal line being associated with a subset of the plurality of memory cells; and
a local write line configured for connection to a subset of the plurality of memory cells, wherein the local write line is configured for connection to selection logic that receives a signal from the global write word line and the selection signal line associated with the subset of the plurality of memory cells.
6. The signal network of claim 5 , wherein a gate of a pull down transistor controlled using signals on the read word line is connected to a storage node of a particular memory cell.
7. The signal network of claim 5 , wherein the global write word line is not directly connected to any of the memory cells.
8. The signal network of claim 5 , wherein a particular memory cell is responsive to a write input and a write bar input, wherein the selection logic is configured to generate signals to the write input and the write bar input.
9. The signal network of claim 5 , wherein a particular memory cell is configured to store data from a data input of the particular memory cell when the particular memory cell is a member of the particular subset of memory cells activated by the selection logic.
10. The signal network of claim 5 , wherein a particular memory cell is responsive to a read input, a write input, a write bar input.
11. The signal network of claim 10 , wherein the selection logic is configured to generate signals for the write input and the write bar input using one NAND gate and one inverter.
12. The signal network of claim 10 , wherein the selection logic is configured to generate signals for the write input and the write bar input using one NOR gate and one inverter.
13. The signal network of claim 5 , wherein the word of data corresponds to M bits and wherein each local write line controls M/N bits.
14. The signal network of claim 13 , wherein M=64; N=8; and M/N=8.
15. The signal network of claim 13 , wherein the memory circuit includes M/N pins for inputting data to write.
16. The signal network of claim 15 , wherein the memory circuit includes M or M/N pins for outputting read data.
17. The signal network of claim 13 , wherein the memory circuit is configured for simultaneous writing of x*M/N bits at a time, where x is an integer between 1 and N.
18. The signal network of claim 5 , wherein the memory cells are 2P8T, 2P10T, or 3P10T memory cells.
19. A method of operating a memory circuit comprising a plurality of memory cells corresponding to a word of data, comprising:
providing a signal on a global write word line indicating data is to be written;
providing a selection signal;
transmitting a signal on a local write line connected to the plurality of memory cells based on the selection signal and the global write word line signal; and
writing data present on a plurality of input data pins to the memory cells based on the signal transmitted on the local write line.
20. The method of claim 19 , further comprising:
providing a signal on a write word line that is provided to all of the memory cells of the word of data.