6.3 Page Write

The page write operation of the AT28C64B allows one to 64 bytes of data to be written into the device during a single internal programming period. A page write operation is initiated in the same manner as a byte write; the first byte written can then be followed by one to 63 additional bytes. Each successive byte must be written within 150 µs (t_BLC) of the previous byte. If the t_BLC limit is exceeded, the AT28C64B will cease accepting data and commence the internal programming operation. All bytes during a page write operation must reside on the same page as defined by the state of the A6‑A12 inputs. For each WE high‑to‑low transition during the page write operation, A6‑A12 must be the same. The A0 to A5 inputs are used to specify which bytes within the page are to be written. The bytes may be loaded in any order and may be altered within the same load period. Only bytes which are specified for writing will be written; unnecessary cycling of other bytes within the page does not occur.