Datasheet

SM646UDR26485-2-I
January 31, 2006
Corporate Headquarters: P. O. Box 1757, Fremont, CA 94538, USA • Tel:[phone] • Fax:[phone] • E-mail: [e-mail]
Europe: 5 Kelvin Park South, Kelvin South, East Kilbride, G75 ORH, United Kingdom • Tel: [phone] • Fax: [phone]
Asia/Pacific: Plot 18, Lrg Jelawat 4, Kawasan Perindustrian Seberang Jaya 13700, Prai, Penang, Malaysia • Tel: [phone] • Fax: [phone]
14
Extended Mode Register Table
BA2 BA1 BA0 A15~A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 Address Field
E18 E17 E16 E15~E14 E13 E12 E11 E10 E9 E8 E7 E6 E5 E4 E3 E2 E1 E0
Extended
Mode Register
0
1
EMR
0
1
0Q
off
RDQS DQS# OCD Program R
TT
Additive latency R
TT
D.I.C DLL
E0 DLL Enable
0 Enable
1 Disable
E6 E2 R
TT (Nominal)
0 0 ODT Disabled
0175 ohm
1 0 150 ohm
1150 ohm
E5 E4 E3 Additive Latency
000 0
001 1
010 2
011 3
100 4
1 0 1 Reserved
1 1 0 Reserved
1 1 1 Reserved
E9 E8 E7 OCD Calibration Program
0 0 0 OCD calibration mode exit; maintain setting
0 0 1 Drive (1)
0 1 0 Drive (0)
011
Adjust mode
2
(See page 13)
111
OCD calibration default
3
(See page 13)
E17 E16 MRS mode
00MRS
0 1 EMRS (1)
1 0 EMRS (2)
1 1 EMRS (3): Reserved
E1 Output Driver
Impedence Control
Driver
Size
0 Normal 100%
1Weak60%
E11
(RDQS Enable)
E10
(DQS# Enable)
Strobe Function Matrix
RDQS/DM RDQS# DQS DQS#
0 (Disable) 0 (Enable) DM Hi-z DQS DQS#
0 (Disable) 1 (Disable) DM Hi-z DQS Hi-z
1 (Enable) 0 (Enable) RDQS RDQS# DQS DQS#
1 (Enable) 1 (Disable) RDQS Hi-z DQS Hi-z
E10 DQS#
0 Enable
1 Disable
E12
Q
off
(Optional)
4
(See page 13)
0 Output buffer enabled
1 Output buffer disabled
E11 RDQS
0 Disable
1
Enable
5
(See page 13)