IBM16M32644HGA
IBM16M32734HGA
IBM16M64644HGA
IBM16M64734HGA
32/64Mx64/72 1 or 2 Bank Registered DDR SDRAM Module
Preliminary
Serial Presence Detect (Part 1 of 3)
Serial PD Data Entry
Byte #
Description
SPD Entry Value
Notes
(Hexadecimal)
0
1
2
3
4
Number of Serial PD Bytes Written during Production
Total number of bytes in Serial PD Device
Fundamental Memory Type
128
80
08
07
0D
0A
01
02
256
SDRAM DDR
Number of Row Addresses on Assembly
Number of Column Addresses on Assembly
13
10
1
32Mx64, 72
5
Number of Physical Banks on DIMM
64Mx64, 72
2
32M,
x64
x72
4000
4800
64Mx64
6-7 Data Width of Assembly
32M,
64Mx72
8
9
Voltage Interface Level of this Assembly
SSTL 2.5V
8.0ns
04
80
PC200
PC266B
PC200
SDRAM Device Cycle Time at Maximum CL (CLX
= 2.5)
1
7.5ns
0.8ns
80
SDRAM Device Access Time from Clock at
CL=2.5
10
PC266B
0.75ns
32M,
Non-parity
00
02
64Mx64
11 DIMM Configuration Type
32M,
64Mx72
ECC
7.8µs/SR
12 Refresh Rate/Type
82
08
08
13 Primary SDRAM Device Width
14 Error Checking SDRAM Device Width
x8
x8
SDRAM Device Attributes: Minimum Clock Delay, Random Col-
umn Access
15
1 Clock
01
16 SDRAM Device Attributes: Burst Lengths Supported
17 SDRAM Device Attributes: Number of Device Banks
18 SDRAM Device Attributes: CAS Latency
19 SDRAM Device Attributes: CS Latency
2, 4, 8
0E
04
0C
01
02
4
2, 2.5
0
20 SDRAM Device Attributes: WE Latency
1
Registered with PLL,
Differential clock
21 SDRAM Module Attributes
26
00
VDD ± 0.2V
22 SDRAM Device Attributes: General
PC200
10.0ns
8.0ns
A0
80
23 Minimum Clock Cycle at CLX-0.5 (CL = 2)
1
PC266B
PC200
± 0.8ns
80
Maximum Data Access Time (t ) from Clock at
AC
24
CLX-0.5 (CL = 2)
PC266B
± 0.75ns
75
00
25 Minimum Clock Cycle Time at CLX-1 (CL = 1.5)
N/A
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
Page 10 of 28
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