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ACT-D1M96S Datasheet(PDF) 4 Page - Aeroflex Circuit Technology |
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ACT-D1M96S Datasheet(HTML) 4 Page - Aeroflex Circuit Technology |
4 / 14 page Aeroflex Circuit Technology SCD3369-1 REV C 5/31/00 Plainview NY (516) 694-6700 4 Auto Refresh (REFR) Before performing a REFR, both banks of all 6 chips must be deactivated (placed in precharge). To enter a REFR command, RAS and CAS must be low and WE must be high upon the rising edge of CLK (see Table 1). The refresh address is generated internally such that, after 4096 REFR commands, both banks of all 6 chips of the ACT-D1M96S have been refreshed. The external address and bank select (A11) are ignored. The execution of a REFR command automatically deactivates both banks upon completion of the internal auto-refresh cycle, allowing consecutive REFR-only commands to be executed, if desired, without any intervening DEAC commands. The REFR commands do not necessarily have to be consecutive, but all 4096 must be completed before tREF expires. Power Up Initialization Device initialization should be performed after a power up to the full VCC level. After power is established, a 200µs interval is required (with no inputs other than CLK). After this interval, both banks of the device must be deactivated. Eight REFR commands must be performed, and the mode register must be set to complete the device initialization. General Information for AC Timing Measurements All specifications referring to READ commands are also valid for READ-P commands unless otherwise noted. All specifications referring to WRT commands are also valid for WRT-P commands unless otherwise noted. All specifications referring to consecutive commands are specified as consecutive commands for the same bank unless otherwise noted. Note: For all pin references in the General Description, both sections apply. For example, A11 signals also apply for BA11 signals. For additional Detail Information regarding the operation of the individual chip (MT48LC1M16A1) see Micron’s 524,288-WORD BY 16-BIT BY 2-BANK SYNCHRONOUS DYNAMIC RANDOM-ACCESS MEMORY Datasheet Revision 8/99 or contact the Aeroflex Sales Department. |
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