Method and system for providing a shared write driver

1. A method for providing a shared write driver, comprising:

providing a write driver as part of a sense amplifier for a memory array comprising a plurality of memory columns, each memory column comprising a plurality of memory cells, the memory array comprising an upper memory comprising a first portion of the memory columns and a lower memory comprising a second portion of the memory columns;

coupling the write driver to the plurality of memory columns via a multiplexer;

receiving a write signal and write data at the write driver;

receiving a select signal at the multiplexer;

accessing one of the memory columns in the upper memory when the select signal comprises a select upper signal and one of the memory columns in the lower memory when the select signal comprises a select lower signal; and

writing a value identified by the write data into one of the memory cells in the accessed memory column.

2. The method of claim 1 , each memory column comprising a pair of transmission gates, accessing the memory column comprising accessing the memory column through the multiplexer, and writing the value identified by the write data into the memory cell comprising writing the value identified by the write data into the memory cell through the multiplexer and a transmission gate.

3. A system for providing a shared write driver, comprising:

a memory array comprising a plurality of memory columns, each memory column comprising a plurality of memory cells, the memory array comprising an upper memory comprising a first portion of the memory columns and a lower memory comprising a second portion of the memory columns;

a sense amplifier for the memory array, the sense amplifier comprising a write driver; and

a multiplexer to couple the write driver to the plurality of memory columns, the multiplexer operable to receive a select signal and the write driver operable to receive a write signal and write data, to access one of the memory columns in the upper memory when the select signal comprises a select upper signal and one of the memory columns in the lower memory when the select signal comprises a select lower signal, and to write a value identified by the write data into one of the memory cells in the accessed memory column.

4. The system of claim 3 , each memory column comprising a pair of transmission gates, the write driver operable to access the memory column through the multiplexer, and to write the value identified by the write data into the memory cell though the multiplexer and a transmission gate.

5. The system of claim 3 , wherein the write driver further comprises;

a first and second NAND gate;

a first, second and third inverter; and

a first, second and third transistor, the first inverter coupled to a first input for the first NAND gate, the second inverter coupled to an output for the first NAND gate and to the first transistor, the third inverter coupled to an output of the second NAND gate and to the second transistor, the first and second transistors coupled to the third transistor.

6. The system of claim 5 , a second input for the first NAND gate and a first input for the second NAND gate operable to receive a write signal.

7. The system of claim 6 , the first inverter and a second input for the second NAND gate operable to receive a write data signal.

8. The system of claim 7 , the third transistor coupled to a sense amplifier.