There used to be a DRAM with build-in SRAM cache called EDRAM (Enhanced DRAM, no...

There used to be a DRAM with build-in SRAM cache called EDRAM (Enhanced DRAM, not to be confused with eDRAM Embedded DRAM).

• 2Kbit SRAM Cache Memory for 15ns Random Reads Within a Page

• Fast 4Mbit DRAM Array for 35ns Access to Any New Page

• Write Posting Register for 15ns Random Writes and Burst Writes Within a Page (Hit or Miss)

• 256-byte Wide DRAM to SRAM Bus for 7.3 Gigabytes/Sec Cache Fill

• On-chip Cache Hit/Miss Comparators Maintain Cache Coherency on Writes

Afaik only ever manufactured by a single vendor Ramtron https://bitsavers.computerhistory.org/components/ramtron/_da... and only ever used in two products:

- Mylex DAC960 RAID controller