IBM13N8644HCC
IBM13N8734HCC
8M x 64/72 One-Bank Unbuffered SDRAM Module
Serial Presence Detect (Part 1 of 2)
Serial PD Data Entry (Hexa-
Byte #
Description
SPD Entry Value
Notes
decimal)
0
1
2
3
4
5
Number of Serial PD Bytes Written during Production
Total Number of Bytes in Serial PD device
Fundamental Memory Type
128
80
256
08
SDRAM
04
Number of Row Addresses on Assembly
Number of Column Addresses on Assembly
Number of DIMM Banks
12
0C
09
9
1
01
8M x 64
8M x 72
x64
4000
4800
01
6 - 7
Data Width of Assembly
x72
8
9
Voltage Interface Level of this Assembly
SDRAM Device Cycle Time at CL=3
LVTTL
10.0ns
A0
60
-260, -360
-10
6.0ns
1
10
11
SDRAM Device Access Time from Clock at CL=3
DIMM Configuration Type
7.0ns
70
8M x 64
8M x 72
Non-Parity
00
ECC
02
12
13
Refresh Rate/Type
SR/1x(15.625us)
80
Primary SDRAM Device Width
x8
08
8M x 64
8M x 72
N/A
00
14
Error Checking SDRAM Device Width
x8
08
15
16
17
18
19
20
21
SDRAM Device Attr: Min Clk Delay, Random Col Access
SDRAM Device Attributes: Burst Lengths Supported
SDRAM Device Attributes: Number of Device Banks
SDRAM Device Attributes: CAS Latencies Supported
SDRAM Device Attributes: CS Latency
1 Clock
01
1,2,4,8, Full Page
8F
4
04
2, 3
06
0
0
01
SDRAM Device Attributes: WE Latency
01
SDRAM Module Attributes
Unbuffered
00
Wr-1/Rd Burst, Precharge All,
Auto-Precharge, VDD +/- 10%
22
SDRAM Device Attributes: General
0E
-260
-360
-10
10.0ns
15.0ns
15.0ns
6.0ns
9.0ns
8.0ns
N/A
A0
F0
F0
60
90
80
00
00
14
1E
14
14
14
1E
32
3C
23
Minimum Clock Cycle at CL=2
-260
-360
-10
Maximum Data Access Time (tAC) from Clock at
CL=2
1
24
25
26
Minimum Clock Cycle Time at CL=1
Maximum Data Access Time (tAC) from Clock at CL=1
N/A
-260, -360
-10
20ns
30ns
20ns
20ns
20ns
30ns
50ns
60ns
Minimum Row Precharge Time (tRP
)
27
28
29
30
-260, -360
-10
Minimum Row Active to Row Active delay (tRRD
)
-260, -360
-10
Minimum RAS to CAS delay (tRCD
)
-260, -360
-10
Minimum RAS Pulse width (tRAS
)
1. See the AC output load circuit in the AC Characteristics section below
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. yy = Binary coded decimal year code, 00-99 (Decimal) 00-63 (Hex)
6. ww = Binary coded decimal week code, 01-52 (Decimal) 01-34 (Hex)
7. ss = Serial number data byte, 00-FF (Hex)
19L7295.E93875B
12/99
©IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
Page 7 of 19
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