X84128

The Port Saver memories need no serial ports or special hardware and connect to the processor memory bus. Replacing bytewide data memory, the Port Saver uses bytewide memory control functions, takes a fraction of the board space and consumes much less power. Replacing serial memories, the Port Saver provides all the serial benefits, such as low cost, low power, low voltage, and small package size while releasing I/Os for more important uses.

The Port Saver memory outputs data within 20ns of an active read signal. This is less than the read access time of most hosts and provides "no-wait-state" operation. This prevents bottlenecks on the bus. With rates to 15MHz, the Port Saver supplies data faster than required by most host read cycle specifications. This eliminates the need for software NOPs.

The Port Saver memories communicate over one line of the data bus using a sequence of standard bus read and write operations. This "bit serial" interface allows the Port Saver to work well in 8-bit, 16 bit, 32-bit, and 64-bit systems.

The X84160/640/128 provide additional data security features through Block Lock and programmable Hardware Write Protection. These Port Saver memory  allow some or all of the array to be write protected by software command or by hardware. System Configuration, Company ID, calibration information, or other critical data can be secured against unexpected or inadvertent program operations, leaving the remainder of the memory available for the system or user access A Write Protect (WP) pin prevents inadvertent writes to the memory.Xicor EEPROMs are designed and tested for applications requiring extended endurance. Inherent data retention is greater than 100 years.