Dataram DTM65525B Datasheet download pdf (Page 14)

DTM65525B

2 GB, 240-Pin DDR2 FB-DIMM

Bit 3 ~ Bit 0. Minimum WL (clocks) - 2

Bit 7 ~ Bit 4. WL Range (clocks) - 4

18 SDRAM Additive Latencies Supported. 0x50

Bit 3 ~ Bit 0. Minimum AL (clocks)- 0

Bit 7 ~ Bit 4. AL Range (clocks) - 5

19 SDRAM Minimum RAS to CAS Delay (tRCD). 12.5ns 0x32

20 SDRAM Minimum Row Active to Row Active Delay (tRRD). 7.5ns 0x1E

21 SDRAM Minimum Row Precharge Time (tRP). 12.5ns 0x32

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). 57.5ns 0xE6

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. 0x00

Bit 0. Weak Driver -

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. 0x50

Bit 3 ~ Bit 0. DT4R4W Delta, Subfield B: 0.4 °C - 0

Bit 7 ~ Bit 4. Tcasemax, Subfield A: 2 °C - 10

34 Thermal Resistance of SDRAM Package. °C/W 58 0x74

35 SDRAM Case Temperature Rise from Ambient due to Activate-Precharge minus

2.8 °C offset temperature (DT0). °C

0x48

Bit 1, Bit 0. Reserved 0

Bit 7 ~ Bit 2. DT0 - 5.4

36 SDRAM Case Temperature Rise from Ambient due to

Precharge/Quiet

5 0x32

1 2 ... 9 10 11 12 13 14 15 16 17 18

DTM65525B 1

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Dataram DTM65525B Datasheet Page 14

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