MT9VDDT6472HY-40B Micron Semiconductor Products, MT9VDDT6472HY-40B Datasheet - Page 10

• Manufacturer Part Number: MT9VDDT6472HY-40B
• Description: 256mb, 512mb, 1gb X72, Ecc, Sr 200-pin Ddr Sodimm
• Manufacturer: Micron Semiconductor Products

Extended Mode Register
beyond those controlled by the mode register; these
additional functions are DLL enable/disable and out-
put drive strength. These functions are controlled via
the bits shown in Figure 6, Extended Mode Register
Definition Diagram. The extended mode register is
programmed via the LOAD MODE REGISTER com-
mand to the mode register (with BA0 = 1 and BA1 = 0)
and will retain the stored information until it is pro-
grammed again or the device loses power.
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
operation.
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 with CKE HIGH must occur
before a READ command can be issued.
pdf: 09005aef811d6080, source: 09005aef806e057b
DDA9C32_64_128x72HG.fm - Rev. B 06/05 EN
The extended mode register controls functions
The extended mode register must be loaded when
The DLL must be enabled for normal operation.
The
256MB, 512MB, 1GB (x72, ECC, SR)
10
256MB and 512MB Modules
NOTE:
1GB Module
E13
1. BA1 and BA0 (E14 and E13 for 256MB, 512MB, or E15
2. QFC# is not supported.
0
0
–
15
1
BA1 BA0
and E14 for 1GB) must be “0, 1” to select the Extended
Mode Register (vs. the base Mode Register).
Figure 6: Extended Mode Register
1
E12
0 1
14
BA1 BA0
0
14
1
–
Micron Technology, Inc., reserves the right to change products or specifications without notice.
1 1
13
E11
13
0
–
A13
12
E10
A12
12
A12
0
–
11
A11
11
E9
A11
0
–
Definition Diagram
10
E8
A10
10
0
–
A10
Operating Mode
Operating Mode
200-PIN DDR SODIMM
E7
9
0
–
A9
9
A9
E6 E5
0
–
8
A8
8
A8
0
–
7
A7 A6 A5 A4 A3
7
A7 A6 A5 A4 A3
E4
0
–
6
6
E3
0
–
5
5
©2005 Micron Technology, Inc. All rights reserved.
E2
0
–
4
4
3
3
E1,
Valid
–
2
E0
A2 A1 A0
2
A2 A1 A0
DS
DS
1
1
E1
DLL
0
DLL
Operating Mode
Reserved
Reserved
0
0
E0
0
1
Extended Mode
Register (Ex)
Drive Strength
Extended Mode
Register (Ex)
Address Bus
Address Bus
Normal
Disable
Enable
DLL