MT8VDDT6464HD Micron Semiconductor Products, MT8VDDT6464HD Datasheet - Page 10

• Manufacturer Part Number: MT8VDDT6464HD
• Description: (MT8VDDTxx64HD) 200-Pin DDR Sdram Sodimms
• Manufacturer: Micron Semiconductor Products

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BA1 = 0) and will retain the stored information until it
is programmed again or the device loses power. The
enabling of the DLL should always be followed by a
LOAD MODE REGISTER command to the mode regis-
ter (BA0/BA1 both LOW) to reset the DLL.
all device banks are idle and no bursts are in progress,
and the controller must wait the specified time before
initiating any subsequent operation. Violating either
of these requirements could result in unspecified oper-
ation.
Output Drive Strength
specified to be SSTL2, Class II. The x16 DDR SDRAM
devices used in these modules support an option for
reduced drive. The reduced drive option is intended
for lighter load and point-to-point environments. For
detailed information on output drive strength options,
refer to 128Mb, 256Mb, and 512Mb DDR SDRAM com-
ponent data sheets.
DLL Enable/Disable
DLL enable is required during power-up initialization
and upon returning to normal operation after having
disabled the DLL for the purpose of debug or evalua-
tion. (When the device exits self refresh mode, the DLL
is enabled automatically.) Any time the DLL is enabled,
200 clock cycles must occur before a READ command
can be issued.
09005aef806e1d28
DD8C16_32_64x64HDG_B.fm - Rev. B 7/03 EN
The extended mode register must be loaded when
The normal full drive strength for all outputs is
The DLL must be enabled for normal operation.
10
NOTE:
128MB Module
256MB and 512MB Modules
1. BA1 and BA0 (E13 and E12 for 128MB or E14 and E13
2. The QFC# option is not supported.
E11
0
14
0
–
BA1 BA0
1
for 256MB and 512MB) must be “0, 1” to select the
Extended Mode Register (vs. the base Mode Register).
Figure 6: Extended Mode Register
E10
0
1
13
BA1 BA0
13
1
0
–
1
Micron Technology, Inc., reserves the right to change products or specifications without notice.
128MB, 256MB, 512MB (x64)
1
E9
12
1
12
0
–
A12
11
E8
11
A11
0
–
A11
E7
10
0
–
10
A10
A10
Definition Diagram
E6 E5
0
–
9
Operating Mode
9
A9
A9
Operating Mode
200-PIN DDR SODIMM
0
–
8
A8
8
A8
E4
0
–
7
7
A7 A6 A5 A4 A3
A7 A6 A5 A4 A3
E3
0
–
6
6
E2
0
–
5
2
5
©2003 Micron Technology, Inc. All rights reserved.
4
4
E1,
Valid
–
3
E0
3
2
2
A2 A1 A0
A2 A1 A0
DS
DS
Operating Mode
Normal Operation
All other states reserved
1
1
E1
0
1
DLL
DLL
0
0
E0
0
1
Extended Mode
Register (Ex)
Extended Mode
Register (Ex)
Drive Strength
Address Bus
Address Bus
Reduced
Normal
Disable
Enable
DLL