The Anvo-Systems Dresden ANV32AA1WD is a 1Mb serial SRAM with a non-volatile SONOS storage element included with each memory cell, organized as 128k words of 8 bits each. The devices are accessed by a high speed SPI-compatible bus. The ANV32AA1WD is enabled through the Chip Enable pin (E) and accessed via a 3-wire interface consisting of Serial Data Input (SI), Serial Data Output (SO) and Serial Clock (SCK). All programming cycles are self-timed, and no separate ERASE cycle is required before STORE.
The serial SRAM provides the fast access & cycle times, ease of use and unlimited read & write endurance of a standard SRAM. Dedicated safety features supporting high data accuracy.
With Secure WRITE operation the ANV32AA1WD accepts address and data only when the correct 2 Byte CRC, generated from the 17 bit address and 128 Byte data, has been transmitted. Corrupt data cannot overwrite existing memory content and even valid data would not overwrite on a corrupted address. With status register bit 4 the success of the Secure WRITE operation can be monitored. In case of corrupt data bit 4 will be set volatile to high.
With Secure READ operation the ANV32AA1WD calculates the correct 2 Byte CRC parallel to data transfer. The 2 Byte CRC is transmitted after 128 Bytes of data have been read out.
Data transfers automatically to the non-volatile storage cells when power loss is detected or in any brown out situation (the PowerStore operation). On power up, data is automatically restored to the SRAM (the Power Up Recall operation).
The PowerStore operation can be disabled via Status Register settings.
With Read Last Successful Written Address it is possible, after Power Up Recall, to read out the address where data were last written successfully, before a PowerStore.
Both STORE and RECALL operations are also available under instruction control.
BLOCK WRITE Protection is enabled by programming the status register with one of four options to protect blocks.
A 16 Byte non-volatile register supports the option of a 16 Byte user defined serial number. This register is under customer control only.