EBE25UD6ABSA
Byte No. Function described
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 Hex value
Comments
256M bytes
31
Module rank density
0
0
0
0
0
0
1
0
0
0
1
0
0
1
1
1
0
0
0
0
1
1
0
1
0
0
0
1
1
0
0
1
1
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
40H
25H
35H
38H
48H
10H
Address and command setup time
before clock (tIS)
-5C
32
0.25ns*1
0.35ns*1
0.38ns*1
0.48ns*1
0.10ns*1
-4A
Address and command hold time after
clock (tIH)
-5C
33
-4A
Data input setup time before clock
34
35
(tDS)
-5C
-4A
0
0
0
0
0
1
1
0
0
0
1
0
0
1
1
1
15H
23H
0.15ns*1
0.23ns*1
Data input hold time after clock (tDH)
-5C
-4A
0
0
0
0
1
1
0
1
1
1
0
1
0
0
0
0
28H
3CH
0.28ns*1
15ns*1
36
37
Write recovery time (tWR)
Internal write to read command delay
(tWTR)
-5C
0
0
0
1
1
1
1
0
1EH
7.5ns*1
-4A
0
0
0
0
1
0
0
1
1
1
0
1
0
1
0
0
28H
1EH
10ns*1
7.5ns*1
Internal read to precharge command
delay (tRTP)
38
39
40
41
Memory analysis probe characteristics 0
0
0
0
0
0
1
0
0
1
0
0
0
0
0
1
0
0
1
0
0
1
00H
00H
37H
TBD
Extension of Byte 41 and 42
0
0
Undefined
55ns*1
Active command period (tRC)
Auto refresh to active/
42
43
44
0
1
0
0
0
1
0
0
0
0
1
0
0
1
1
0
0
1
0
0
1
0
1
0
1
0
0
1
0
0
0
0
1
1
0
1
0
0
1
0
69H
80H
1EH
23H
28H
105ns*1
8ns*1
Auto refresh command cycle (tRFC)
SDRAM tCK cycle max. (tCK max.)
Dout to DQS skew
-5C
0.30ns*1
0.35ns*1
0.40ns*1
-4A
Data hold skew (tQHS)
-5C
-4A
45
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
1
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
2DH
00H
00H
10H
0.45ns*1
46
PLL relock time
Undefined
47 to 61
62
SPD Revision
Rev. 1.0
Checksum for bytes 0 to 62
-5C
-4A
63
0
1
0
1
1
1
1
1
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
1
7BH
FFH
7FH
Continuation
code
64 to 65
Manufacturer’s JEDEC ID code
66
Manufacturer’s JEDEC ID code
Manufacturer’s JEDEC ID code
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
0
FEH
00H
Elpida Memory
67 to 71
(ASCII-8bit
code)
72
Manufacturing location
×
×
×
×
×
×
×
×
××
Data Sheet E0553E21 (Ver. 2.1)
6
ELPIDA [ ELPIDA MEMORY ]
