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GS4288C09 Datasheet(PDF) 6 Page - GSI Technology |
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GS4288C09 Datasheet(HTML) 6 Page - GSI Technology |
6 / 62 page GS4288C09/18/36L Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. Rev: 1.03 7/2014 6/62 © 2011, GSI Technology Operations Initialization A specific power-up and initialization sequence must be observed. Other sequences may result in undefined operations or permanent damage to the device. Power-up: 1. Apply power (VEXT, VDD, VDDQ, VREF, VTT) . Start clock after the supply voltages are stable. Apply VDD and VEXT before or at the same time as VDDQ 1. Apply V DDQ before or at the same time as VREF and VTT. The chip starts internal initlization only after both voltages approach their nominal levels. CK/CK must meet VID(DC) prior to being applied 2. Apply only NOP commands to start. Ensuring CK/CK meet V ID (DC) while loading NOP commands guarantees that the LLDRAM II will not receive damaging commands during initialization. 2. Idle with continuing NOP commands for 200 s (MIN). 3. Issue three or more consecutive MRS commands: two or more dummies plus one valid MRS. The consecutive MRS commands will reset internal logic of the LLDRAM II. tMRSC does not need to be met between these consecutive commands. Address pins should be held Low during the dummy MRS commands. QVLD Output Data Valid—The QVLD pin indicates valid output data. QVLD is edge-aligned with QKx and QKx. TDO Output IEEE 1149.1 Test Output—JTAG output. This ball may be left as no connect if the JTAG function is not used. VDD Supply Power Supply—Nominally, 1.8 V. See the DC Electrical Characteristics and Operating Conditions section for range. VDDQ Supply DQ Power Supply—Nominally, 1.5 V or 1.8 V. Isolated on the device for improved noise immunity. See the DC Electrical Characteristics and Operating Conditions section for range. VEXT Supply Power Supply—Nominally, 2.5 V. See the DC Electrical Characteristics and Operating Conditions section for range. VSS Supply Ground VTT — Power Supply—Isolated termination supply. Nominally, VDDQ/2. See the DC Electrical Characteristics and Operating Conditions section for range. A21, A22 — Reserved for Future Use—This signal is not connected and may be connected to ground. DNU — Do Not Use—These balls may be connected to ground. NF — No Function—These balls can be connected to ground. Ball Descriptions (Continued) Symbol Type Description |
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