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TMS626162A Datasheet(PDF) 4 Page - Texas Instruments |
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TMS626162A Datasheet(HTML) 4 Page - Texas Instruments |
4 / 44 page TMS626162A 524288 BY 16-BIT BY 2-BANK SYNCHRONOUS DYNAMIC RANDOM-ACCESS MEMORY SMOS692B – JULY 1997 – REVISED MARCH 1998 4 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 operation (continued) Table 2. Clock Enable (CKE) Command Function Table† COMMAND‡ STATE OF BANK(S) CKE (n – 1) CKE (n) CS (n) RAS (n) CAS (n) W (n) MNEMONIC Self-refresh entry T = deac B = deac H L L L L H SLFR Power-down entry on cycle (n + 1)§ T = no access operation¶ B = no access operation¶ H L X X X X PDE Self refresh exit T = self refresh L H L H H H — Self-refresh exit B = self refresh L H H X X X — Power-down exit# T = power down B = power down L H X X X X — CLK suspend on cycle (n + 1) T = access operation¶ B = access operation¶ H L X X X X HOLD CLK suspend exit on cycle (n + 1) T = access operation¶ B = access operation¶ L H X X X X — † For execution of these commands, A0 – A11 (n) and DQMx (n) are don’t care entries. ‡ All other unlisted commands are considered vendor-reserved commands or illegal commands. § On cycle n, the device executes the respective command (listed in Table 1). On cycle (n + 1), the device enters power-down mode. ¶ A bank is no longer in an access operation one cycle after the last data-out cycle of a read operation, and two cycles after the last data-in cycle of a write operation. Neither the PDE nor the HOLD command is allowed on the cycle immediately following the last data-in cycle of a write operation. # If setup time from CKE high to the next CLK high satisfies tCESP, the device executes the respective command (listed in Table 1). Otherwise, either DESL or NOOP command must be applied before any other command. Legend: n = CLK cycle number L = Logic low H = Logic high X = Don’t care, either logic low or logic high T = Bank T B = Bank B deac = Deactivated |
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