13.07.2015 Views

MEMORY DATABOOK - Al Kossow's Bitsavers

MEMORY DATABOOK - Al Kossow's Bitsavers

MEMORY DATABOOK - Al Kossow's Bitsavers

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

______________ 1. DYNAMIC RAM' MSM37S64ARS/37S64RS •each of the 128 row-addresses (AD - Ae) atleast every two milliseconds. During refresh,either VIL or VIH is permitted for A7. RAS only refreshavoids any output during refresh becausethe output buffer is in the high impedance stateunless CAS is brought low. Strobing each of 128row-addresses with RAS will cause all bits ineach row to be refreshed. Further RAS-only refreshresults in a substantial reduction in powerdissipation.Hidden Refresh:RAS ONLY REFRESH CYCLE may take placewhile maintaining valid output data. This featureis referred to as Hidden Refresh.Hidden Refresh is performed by holding CASas VIL from a previous memory read cycle.233

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!