The M29W128FH and M29W128FL are 128 Mbit (16Mb x8 or 8Mb x16) non-volatile memories that can be read, erased and reprogrammed. These operations can be performed using a single low voltage (2.7 to 3.6V) supply. At Power-up the memories default to Read mode. The M29W128FH and M29W128FL are divided into 256 thirty-two KWord (sixty-four KByte) uniform blocks.