SST32HF32A1

The SST32HF32A1 ComboMemory devices integrate a CMOS flash memory bank with a CMOS PseudoSRAM (PSRAM) memory bank in a Multi-Chip Package (MCP), manufactured with SST's proprietary, high-performance SuperFlash technology.

Featuring high-performance Word-Program, the flash memory bank provides a maximum Word-Program time of 7 sec. To protect against inadvertent flash write, the SST32HF32A1 devices contain on-chip hardware and software data protection schemes. The SST32HF32A1 devices offer a guaranteed endurance of 10,000 cycles. Data retention is rated at greater than 100 years.

The SST32HF32A1 devices consist of two independent memory banks with respective bank enable signals. The flash and PSRAM memory banks are superimposed in the same memory address space. Both memory banks share common address lines, data lines, WE# and OE#. The memory bank selection is done by memory bank enable signals. The PSRAM bank enable signal, BES# selects the PSRAM bank. The flash memory bank enable signal, BEF# selects the flash memory bank. The WE# signal has to be used with Software Data Protection (SDP) command sequence when controlling the Erase and Program operations in the flash memory bank. The SDP command sequence protects the data stored in the flash memory bank from accidental alteration.

The SST32HF32A1 provide the added functionality of being able to simultaneously read from or write to the PSRAM bank while erasing or programming in the flash memory bank. The PSRAM memory bank can be read or written while the flash memory bank performs SectorErase, Bank-Erase, or Word-Program concurrently. All flash memory Erase and Program operations will automatically latch the input address and data signals and complete  the operation in background without further input stimulus requirement. Once the internally controlled Erase or Program cycle in the flash bank has commenced, the PSRAM bank can be accessed for Read or Write.