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H5MS1222EFP-Q3M Datasheet(PDF) 58 Page - Hynix Semiconductor |
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H5MS1222EFP-Q3M Datasheet(HTML) 58 Page - Hynix Semiconductor |
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58 / 62 page  Rev 1.0 / Jun. 2008 58 Mobile DDR SDRAM 128Mbit (4M x 32bit) H5MS1222EFP Series Clock Stop Mode Clock stop mode is a feature supported by Mobile DDR SDRAM devices. It reduces clock-related power consumption during idle periods of the device. Conditions: the Mobile DDR SDRAM supports clock stop in case: ● The last access command (ACTIVE, READ, WRITE, PRECHARGE, AUTO REFRESH or MODE REGISTER SET) has executed to completion, including any data-out during read bursts; the number of required clock pulses per access command depends on the device's AC timing parameters and the clock frequency; ● The related timing condition (tRCD, tWR, tRP, tRFC, tMRD) has been met; ● CKE is held HIGH. When all conditions have been met, the device is either in ''idle'' or ''row active'' state, and clock stop mode may be entered with CK held LOW and CK held HIGH. Clock stop mode is exited when the clock is restarted. NOPs command have to be issued for at least one clock cycle before the next access command may be applied. Additional clock pulses might be required depending on the system characteristics. Figure1 illustrates the clock stop mode: ● Initially the device is in clock stop mode; ● The clock is restarted with the rising edge of T0 and a NOP on the command inputs; ● With T 1 a valid access command is latched; this command is followed by NOP commands in order to allow for clock stop as soon as this access command has completed; ● T n is the last clock pulse required by the access command latched with T1. ● The timing condition of this access command is met with the completion of T n; therefore Tn is the last clock pulse required by this command and the clock is then stopped. Clock Stop Mode CK ADD CMD NOP NOP NOP NOP Valid Clock Stopped Exit Clock Stop Mode Valid Command Enter Clock Stop Mode Don't Care (High-Z) CK CMD T 0 T 1 T 2 T n CKE DQ, DQS Timing Condition |
Similar Part No. - H5MS1222EFP-Q3M |
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Similar Description - H5MS1222EFP-Q3M |
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