SRAM output flickering
The fact that you have tied the \$\overline G\$ and \$\overline E\$ pins hard to ground is probably your issue.

Both those pins are edge triggered to perform control of the outputs. 

WORSE: With them both tied that way, when you try to write to the device you will need to overdrive the outputs of the device. This will probably damage the internal line drivers.

You should read the specification carefully, and apply appropriate timing to ensure you are supplying edges and levels at the correct times and never back driving the device.