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TMS6644148A Datasheet(PDF) 6 Page - Texas Instruments |
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TMS6644148A Datasheet(HTML) 6 Page - Texas Instruments |
6 / 56 page TMS664414, TMS664814, TMS664164 4 194 304 BY 4-BIT/2 097 152 BY 8-BIT/1 048 576 BY 16-BIT BY 4-BANK SYNCHRONOUS DYNAMIC RANDOM-ACCESS MEMORIES SMOS695A – APRIL 1998 – REVISED JULY 1998 6 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 operation (continued) Table 1. Basic Command Truth Table†‡ COMMAND STATE OF BANK(S) CS RAS CAS W A13 A12 A11 A10 A9 – A0 MNEMONIC Mode register set All Banks = deac L L L L X X X X A9 = V, A8 = 0, A7 = 0, A6 – A0 = V MRS Bank deactivate (precharge) X L L H L BS BS X L X DEAC Deactivate all banks X L L H L X X X H X DCAB Bank activate/row-address entry SB = deac L L H H BS BS V V V ACTV Column address entry / write A0 – A7 = V, A8 – A9 = X, for x16 Column-address entry / write operation SB = actv L H L L BS BS X L A0 – A8 = V, A9 = X, for x8 A0 – A9 = V, for x4 WRT Column address entry / write A0 – A7 = V, A8 – A9 = X, for x16 Column-address entry / write operation with auto-deactivate SB = actv L H L L BS BS X H A0 – A8 = V, A9 = X, for x8 A0 – A9 = V, for x4 WRT-P Column address entry/read A0 – A7 = V, A8 – A9 = X, for x16 Column-address entry/read operation SB = actv L H L H BS BS X L A0 – A8 = V, A9 = X, for x8 A0 – A9 = V, for x4 READ Column address entry/read A0 – A7 = V, A8 – A9 = X, for x16 Column-address entry/read operation with auto-deactivate SB = actv L H L H BS BS X H A0 – A8 = V, A9 = X, for x8 A0 – A9 = V, for x4 READ-P No operation X L H H H X X X X X NOOP Control-input inhibit / no operation X H X X X X X X X X DESL Auto refresh§ All banks= deac L L L H X X X X X REFR † For execution of these commands on cycle n, CKE must satisfy requirements for one of the following: — CKE (n – 1) must be high —tCESP from power-down exit (PDE) —tIS and nCLE from clock-suspend (HOLD) exit —tCESP and tRC from self-refresh (SLFR) exit. ‡ DQMx (n) is a don’t care § Auto-refresh or self-refresh entry requires that all banks be deactivated or be in an idle state prior to the command entry. An REFR command turns on four rows (one from each bank; therefore, 4096 REFR commands fully refresh the memory). Legend: n = CLK cycle number actv = Activated L = Logic low deac = Deactivated H = Logic high BS = Logic: (A12 = 0, A13 = 0) select bank 0 (A12 = 1, A13 = 0) select bank 1 (A12 = 0, A13 = 1) select bank 2 (A12 = 1, A13 = 1) select bank 3 X = Don’t care (either logic high or logic low) SB = Select bank by A12 – A13 at cycle n V = Valid |
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