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MT46V32M16TG-8L Datasheet(PDF) 11 Page - Micron Technology |
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MT46V32M16TG-8L Datasheet(HTML) 11 Page - Micron Technology |
11 / 68 page 11 512Mb: x4, x8, x16 DDR SDRAM Micron Technology, Inc., reserves the right to change products or specifications without notice. 512Mx4x8x16DDR_B.p65 – Rev. B; Pub 4/01 ©2001, Micron Technology, Inc. 512Mb: x4, x8, x16 DDR SDRAM ADVANCE Table 2 CAS Latency (CL) Read Latency The READ latency is the delay, in clock cycles, be- tween the registration of a READ command and the availability of the first bit of output data. The latency can be set to 2, or 2.5 clocks, as shown in Figure 2. If a READ command is registered at clock edge n, and the latency is m clocks, the data will be available nominally coincident with clock edge n + m. Table 2 indicates the operating frequencies at which each CAS latency setting can be used. Reserved states should not be used as unknown operation or incompatibility with future versions may result. Figure 2 CAS Latency Operating Mode The normal operating mode is selected by issuing a MODE REGISTER SET command with bits A7-A12 each set to zero, and bits A0-A6 set to the desired values. A DLL reset is initiated by issuing a MODE REGISTER SET command with bits A7 and A9-A12 each set to zero, bit A8 set to one, and bits A0-A6 set to the desired values. Although not required by the Micron device, JEDEC specifications recommend when a LOAD MODE REGISTER command is issued to reset the DLL, it should always be followed by a LOAD MODE REGIS- TER command to select normal operating mode. All other combinations of values for A7-A12 are re- served for future use and/or test modes. Test modes and reserved states should not be used because un- known operation or incompatibility with future ver- sions may result. CK CK# COMMAND DQ DQS CL = 2 READ NOP NOP NOP READ NOP NOP NOP Burst Length = 4 in the cases shown Shown with nominal tAC and nominal tDSDQ CK CK# COMMAND DQ DQS CL = 2.5 T0 T1 T2 T2n T3 T3n T0 T1 T2 T2n T3 T3n DON’T CARE TRANSITIONING DATA ALLOWABLE OPERATING FREQUENCY (MHz) SPEED CL = 2 CL = 2.5 -75Z 75 ≤ f ≤ 133 75 ≤ f ≤133 -75 75 ≤ f ≤ 100 75 ≤ f ≤133 -8 75 ≤ f ≤ 100 75 ≤ f ≤125 |
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