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EDJ2104BASE Datasheet(PDF) 49 Page - Elpida Memory |
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EDJ2104BASE Datasheet(HTML) 49 Page - Elpida Memory |
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49 / 148 page  EDJ2104BASE, EDJ2108BASE Preliminary Data Sheet E1505E20 (Ver. 2.0) 49 [DDR3-1066 Speed Bins] Speed Bin DDR3-1066F CL-tRCD-tRP 7-7-7 Symbol /CAS write latency min. max. Unit Notes tAA 13.125 20 ns tRCD 13.125 ns tRP 13.125 ns tRC 50.625 ns tRAS 37.5 9 × tREFI ns 9 tCK (avg)@CL=5 CWL = 5 Reserved Reserved ns 1, 2, 3, 4, 6 CWL = 6 Reserved Reserved ns 4 tCK (avg)@CL=6 CWL = 5 2.5 3.3 ns 1, 2, 3, 6 CWL = 6 Reserved Reserved ns 1, 2, 3, 4 tCK (avg)@CL=7 CWL = 5 Reserved Reserved ns 4 CWL = 6 1.875 < 2.5 ns 1, 2, 3, 4 tCK (avg)@CL=8 CWL = 5 Reserved Reserved ns 4 CWL = 6 1.875 < 2.5 ns 1, 2, 3 Supported CL settings 6, 7, 8 nCK Supported CWL settings 5, 6 nCK [DDR3-800 Speed Bins] Speed Bin DDR3-800E CL-tRCD-tRP 6-6-6 Symbol /CAS write latency min. max. Unit Notes tAA 15 20 ns tRCD 15 ns tRP 15 ns tRC 52.5 ns tRAS 37.5 9 × tREFI ns 9 tCK (avg)@CL=5 CWL = 5 Reserved Reserved ns 1, 2, 3, 4 tCK (avg)@CL=6 CWL = 5 2.5 3.3 ns 1, 2, 3 Supported CL settings 6 nCK Supported CWL settings 5 nCK Notes: 1 The CL setting and CWL setting result in tCK (avg) (min.) and tCK (avg) (max.) requirements. When making a selection of tCK (avg), both need to be fulfilled: Requirements from CL setting as well as requirements from CWL setting. 2. tCK (avg) (min.) limits: Since /CAS latency is not purely analog - data and strobe output are synchronized by the DLL - all possible intermediate frequencies may not be guaranteed. An application should use the next smaller JEDEC standard tCK (avg) value (2.5, 1.875, 1.5, or 1.25ns) when calculating CL (nCK) = tAA (ns) / tCK (avg)(ns), rounding up to the next ‘Supported CL’. 3. tCK (avg) (max.) limits: Calculate tCK (avg) + tAA (max.)/CL selected and round the resulting tCK (avg) down to the next valid speed bin (i.e. 3.3ns or 2.5ns or 1.875ns or 1.25ns). This result is tCK (avg) (max.) corresponding to CL selected. 4. Reserved’ settings are not allowed. User must program a different value. 5. 'Optional' settings allow certain devices in the industry to support this setting, however, it is not a mandatory feature. |
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