mt18vddt12872ag-335 Micron Semiconductor Products, mt18vddt12872ag-335 Datasheet - Page 32

• Manufacturer Part Number: mt18vddt12872ag-335
• Description: 256mb, 512mb, 1gb, 2gb X72, Ecc, Dr 184-pin Ddr Sdram Udimm
• Manufacturer: Micron Semiconductor Products

Table 23: Serial Presence-Detect Matrix (2GB) (Continued)
“1”/“0”: Serial Data, “driven to HIGH”/“driven to LOW”; notes appear on page 32
NOTE:
pdf: 09005aef80814e61, source: 09005aef807f8acb
DD18C32_64_128_256x72AG.fm - Rev. B 9/04 EN
4. The value of
99-127 Manufacturer-Specific Data (RSVD)
1. Value for -26A
2. The value of
3. The JEDEC SPD specification allows fast or slow slew rate values for these bytes. The worst-case (slow slew rate) value is
48–61 Reserved
BYTE
36-40 Reserved
65-71 Manufacturer’s JEDEC ID Code
73-90 Module Part Number (ASCII)
95-98 Module Serial Number
32
33
34
35
41
42
43
44
45
46
47
62
63
64
72
91
92
93
94
SDRAM device specification is 15ns.
represented here. Systems requiring the fast slew rate setup and hold values are supported, provided the faster mini-
mum slew rate is met.
Address And Command Setup Time,
Address And Command Hold Time,
Data/ Data Mask Input Setup Time,
Data/ Data Mask Input Hold Time,
Min Active Auto Refresh Time,
Minimum Auto Refresh to Active/ Auto Refresh
Command Period,
SDRAM Device Max Cycle Time,
SDRAM Device Max DQS-DQ Skew Time,
SDRAM Device Max Read Data Hold Skew Factor,
t
Reserved
DIMM Height
SPD Revision
Checksum for Bytes 0–62
Manufacturer’s JEDEC ID Code
Manufacturing Location
PCB Identification Code
Identification Code (Continued)
Year of Manufacture in BCD
Week of Manufacture in BCD
QHS
t
t
RP,
RAS used for -26A/-265 modules is calculated from
t
CK set to 7ns (0x70) for optimum BIOS compatibility. Actual device spec. value is 7.5ns.
t
RCD and
t
RFC
DESCRIPTION
t
RAP for -335 modules indicated as 18ns to align with industry specifications; actual DDR
t
RC
t
CK
t
DH
MAX
t
t
IH
DS
t
IS
s
s
(see note 3)
(see note 3)
t
DQSQ)
256MB, 512MB, 1GB, 2GB (x72, ECC, DR)
32
t
75ns (-262/-26A/-265)
13ns (-262/-26A/-265)
0.5ns (-262/-26A/-265)
0.75ns (-262/-26A/-265)
RC -
1.0ns (-262/-26A/-265)
1.0ns (-262/-26A/-265)
0.5ns (-262/-26A/-265)
0.5ns (-262/-26A/-265)
ENTRY (VERSION)
Micron Technology, Inc., reserves the right to change products or specifications without notice.
65ns (-26A/-265)
184-PIN DDR SDRAM UDIMM
60ns (-335/-262)
0.45ns (-335)
0.45ns (-335)
0.45ns (-335)
0.55ns (-335)
(Continued)
t
0.8ns (-335)
0.8ns (-335)
72ns (-335)
12ns (-335)
RP. Actual device spec. value is 40 ns.
Release 1.0
MICRON
01–12
-26A
-335
-262
-265
1–9
0
©2004 Micron Technology, Inc. All rights reserved.
MT18VDDT25672A
Variable Data
Variable Data
Variable Data
Variable Data
01–0C
01–09
A0
A0
2D
2D
BD
EA
1A
80
80
45
50
45
50
00
3C
41
78
78
30
34
32
55
75
00
01
00
10
2C
00
FF
–