![](http://datasheet.mmic.net.cn/280000/HB54A5129F1U-B75B_datasheet_16063134/HB54A5129F1U-B75B_6.png)
HB54A5129F1U-A75B/B75B/10B
Data Sheet E0191H30 (Ver. 3.0)
6
Byte No.
Function described
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 Hex value
Comments
28
Minimum row active to row active
delay (tRRD)
Minimum /RAS to /CAS delay (tRCD) 0
Minimum active to precharge time
(tRAS)
-A75B/B75B
-10B
0
0
1
1
1
1
0
0
3C
15ns
29
1
0
1
0
0
0
0
50
20ns
30
0
0
1
0
1
1
0
1
2D
45ns
0
0
1
1
0
0
1
0
32
50ns
1 bank
512MB
31
Module bank density
1
0
0
0
0
0
0
0
80
32
Address and command setup time
before clock (tIS)
-A75B/B75B
-10B
Address and command hold time after
clock (tIH)
-A75B/B75B
-10B
Data input setup time before clock
(tDS)
-A75B/B75B
-10B
Data input hold time after clock (tDH)
-A75B/B75B
-10B
1
0
0
1
0
0
0
0
90
0.9ns*
5
1
0
1
1
0
0
0
0
B0
1.1ns*
5
33
1
0
0
1
0
0
0
0
90
0.9ns*
5
1
0
1
1
0
0
0
0
B0
1.1ns*
5
34
0
1
0
1
0
0
0
0
50
0.5ns*
5
0
1
1
0
0
0
0
0
60
0.6ns*
5
35
0
1
0
1
0
0
0
0
50
0.5ns*
5
0
1
1
0
0
0
0
0
60
0.6ns*
5
36 to 40
Superset information
Active command period (tRC)
-A75B/B75B
-10B
Auto refresh to active/
Auto refresh command cycle (tRFC)
-A75B/B75B
-10B
0
0
0
0
0
0
0
0
00
Future use
41
0
1
0
0
0
0
0
1
41
65ns*
5
0
1
0
0
0
1
1
0
46
70ns*
5
42
0
1
0
0
1
0
1
1
4B
75ns*
5
0
1
0
1
0
0
0
0
50
80ns*
5
43
SDRAM tCK cycle max. (tCK max.)
Dout to DQS skew
-A75B/B75B
-10B
Data hold skew (tQHS)
-A75B/B75B
-10B
0
0
1
1
0
0
0
0
30
12ns*
5
44
0
0
1
1
0
0
1
0
32
500ps*
5
0
0
1
1
1
1
0
0
3C
600ps*
5
45
0
1
1
1
0
1
0
1
75
750ps*
5
1
0
1
0
0
0
0
0
A0
1000ps*
5
46 to 61
Superset information
0
0
0
0
0
0
0
0
00
Future use
62
SPD revision
Checksum for bytes 0 to 62
-A75B
-B75B
0
0
0
0
0
0
0
0
00
Initial
63
0
0
0
0
0
0
1
1
03
3
0
0
1
1
0
0
1
1
33
51
-10B
1
1
1
1
1
0
0
0
F8
248
64
Manufacturer’s JEDEC ID code
0
0
0
0
0
1
1
1
07
HITACHI
65 to 71
Manufacturer’s JEDEC ID code
0
0
0
0
0
0
0
0
00
*
2
(ASCII-8bit
code)
H
72
Manufacturing location
×
×
×
×
×
×
×
×
××
73
Module part number
0
1
0
0
1
0
0
0
48
74
Module part number
0
1
0
0
0
0
1
0
42
B
75
Module part number
0
0
1
1
0
1
0
1
35
5