General Description
   The A29L400A is an 4Mbit, 3.0 volt-only Flash memory organized as 524,288 bytes of 8 bits or 262,144 words of 16 bits each. The 8 bits of data appear on I/O0 - I/O7; the 16 bits of data appear on I/O0~I/O15. The A29L400A is offered in 48- ball TFBGA, 44-pin SOP and 48-Pin TSOP packages. This device is designed to be programmed in-system with the standard system 3.0 volt VCC supply. Additional 12.0 volt VPP is not required for in-system write or erase operations. However, the A29L400A can also be programmed in standard EPROM programmers.

   The A29L400A has the first toggle bit, I/O6, which indicates whether an Embedded Program or Erase is in progress, or it is in the Erase Suspend. Besides the I/O6 toggle bit, the A29L400A has a second toggle bit, I/O2, to indicate whether the addressed sector is being selected for erase. The A29L400A also offers the ability to program in the Erase Suspend mode. The standard A29L400A offers access times of 70 and 90ns, allowing high-speed microprocessors to operate without wait states. To eliminate bus contention the device has separate chip enable (CE ), write enable ( WE ) and output enable (OE ) controls.