Datasheet
DTM65527E
2 GB – 240-Pin DDR2 Low Power FB-DIMM
Document 06028, Revision A, 29-Sep-09, Dataram Corporation © 2010 Page 14
Bit 7 ~ Bit 4. WL Range (clocks) - 4
18 SDRAM Additive Latencies Supported. 0x40
Bit 3 ~ Bit 0. Minimum AL (clocks)- 0
Bit 7 ~ Bit 4. AL Range (clocks) - 4
19 SDRAM Minimum RAS to CAS Delay (tRCD). 15.0ns 0x3C
20 SDRAM Minimum Row Active to Row Active Delay (tRRD). 7.5ns 0x1E
21 SDRAM Minimum Row Precharge Time (tRP). 15.0ns 0x3C
22 SDRAM Upper Nibbles for tRAS and tRC. 0x00
Bit 3 ~ Bit 0. tRAS Most Significant Nibble -
Bit 7 ~ Bit 4. tRC Most Significant Nibble -
23 SDRAM Minimum Active to Precharge Time (tRAS). 45.0ns 0xB4
24 SDRAM Minimum Active to Active/Refresh Time (tRC). 60.0ns 0xF0
25 SDRAM Minimum Refresh Recovery Time Delay (tRFC), (LSB). 127.5ns 0xFE
26 SDRAM Minimum Refresh Recovery Time Delay (tRFC),
(MSB).
127.5ns 0x01
27 SDRAM Minimum Internal Write to Read Command Delay
(tWTR).
7.5ns 0x1E
28 SDRAM Minimum Internal Read to Precharge Command Delay
(tRTP).
7.5ns 0x1E
29 SDRAM Burst Lengths Supported 0x03
Bit 0. BL = 4 - X
Bit 1. BL = 8 - X
Bit 6 ~ Bit 2.TBD
Bit 7. Burst Chop -
30 SDRAM Terminations Supported. 0x07
Bit 0. 150 ohms ODT - X
Bit 1. 75 ohms ODT - X
Bit 2. 50 ohms ODT - X
Bit 6 ~ Bit 3.TBD
31 SDRAM Drivers Supported. 0x01
Bit 0. Weak Driver - X
Bit 7 ~ Bit 1. TBD
32 SDRAM Average Refresh Interval (tREFI) / Double Refresh mode bit / High
Temperature self-refresh rate support indication.
0xC2
Bit 0 ~ Bit 3. Average Refresh Interval (tREFI) uS - 7.8
Bit 5, Bit 4. TBD 0
Bit 6. High Temperature Self-Refresh - 1-Required
Bit 7. Double Refresh Requirement - 1-Supported
33 Tcasemax Delta. 0x53
Bit 3 ~ Bit 0. DT4R4W Delta, Subfield B: 0.4 °C - 1.2
Bit 7 ~ Bit 4. Tcasemax, Subfield A: 2 °C - 10
34 Thermal Resistance of SDRAM Package. °C/W 69 0x8A
35 SDRAM Case Temperature Rise from Ambient due to Activate-Precharge minus
2.8 °C offset temperature (DT0). °C
0x78
Bit 1, Bit 0. Reserved 0
Bit 7 ~ Bit 2. DT0 - 9
36 SDRAM Case Temperature Rise from Ambient due to
Precharge/Quiet
5.9 0x3B