IBM16M64644HGA
IBM16M64734HGA
IBM16M32644HGA
IBM16M32734HGA
Preliminary
32/64Mx64/72 1 or 2 Bank Registered DDR SDRAM Module
Serial Presence Detect (Part 2 of 3)
Serial PD Data Entry
Byte #
Description
SPD Entry Value
N/A
Notes
(Hexadecimal)
Maximum Data Access Time (t ) from Clock at CLX-1 (CL =
AC
26
00
1.5)
Minimum Row Precharge Time (t
)
27
28
29
20.0ns
15.0ns
50
3C
50
RP
Minimum Row Active to Row Active Delay (t
)
RRD
Minimum RAS to CAS Delay (t
)
20.0ns
50.0ns
RCD
PC200
32
2D
40
C0
A0
C0
A0
60
A0
60
A0
00
00
cc
Minimum Active to Precharge Time (t
)
30
RAS
PC266B
45.0ns
31 Module Bank Density - 32Mx64, x72
256MB
1.2ns
PC200
PC266B
PC200
32 Address and Command Setup Time before Clock
33 Address and Command Hold Time after Clock
34 Data/Data Mask Input Setup Time before Clock
35 Data/Data Mask Input Hold Time after Clock
1.0ns
1.2ns
PC266B
PC200
1.0ns
8
0.6ns
PC266B
PC200
1.0ns
0.6ns
PC266B
1.0ns
36-61 Reserved
Undefined
0
62 SPD Revision
63 Checksum for Bytes 0 - 62
64-71 Manufacturers’ JEDEC ID Code
Checksum Data
IBM
2
A400000000000000
91
53
Toronto, Canada
Vimercate, Italy
72 Module Manufacturing Location
ASCII ‘16M32644HG”R” 31364D33323634344847rr
-10HT 2D313048542020
ASCII ‘16M32734HG”R” 31364D33323733344847rr
-10HT 2D313048542020
ASCII ‘16M64644HG”R” 31364D36343634344847rr
-10HT 2D313048542020
ASCII ‘16M64734HG”R” 31364D36343733344847rr
-10HT 2D313048542020
ASCII ‘16M32644HG”R” 31364D33323634344847rr
-8ET 2D384554202020
ASCII ‘16M32734HG”R” 31364D33323733344847rr
-8ET 2D384554202020
ASCII ‘16M64644HG”R” 31364D36343634344847rr
-8ET 2D384554202020
ASCII ‘16M64734HG”R” 31364D36343733344847rr
32Mx64
32Mx72
64Mx64
64Mx72
32Mx64
32Mx72
64Mx64
64Mx72
PC200
73-90 Module Part Number
3, 4
PC266B
-8ET
2D384554202020
91-92 Module Revision Code
“R” plus ASCII blank
Year/Week Code
rr20
4
93-94 Module Manufacturing Date
yyww
5, 6
1. In a registered DIMM, data is delayed an additional clock cycle due to the on-DIMM pipeline register (that is, Device CL [clock
cycles] + 1 = DIMM CAS latency).
2. cc = Checksum Data byte, 00-FF (Hex).
3. “R” = Alphanumeric revision code, A-Z, 0-9.
4. rr = ASCII coded revision code byte “R”.
5. ww = Binary coded decimal week code, 01-52 (Decimal) ‘ 01-34 (Hex).
6. yy = Binary coded decimal year code, 00-99 (Decimal) ‘ 00-63 (Hex).
7. ss = Serial number data byte, 00-FF (Hex).
8. Setup and hold values assume a 1 Volt/ns slew rate.
©IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
19L7358.H02502
3/00
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