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| HYB18T256161BF Datasheet, PDF (12/40 Pages) Qimonda AG – 256-Mbit x16 DDR2 SDRAM | |||
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Internet Data Sheet
HYB18T256161BFâ20/25/28
256-Mbit Double-Data-Rate-Two SDRAM
Field Bits
OCD [9:7]
Program
Type1)
w
AL
[5:3] w
RTT
6,2 w
DIC
1
w
DLL
0
w
1) w = write only register bits
Description
Off-Chip Driver Calibration Program
000B OCD OCD calibration mode exit, maintain setting
001B OCD Drive (1)
010B OCD Drive (0)
100B OCD Adjust mode
111B OCD OCD calibration default
Additive Latency
Note: All other bit combinations are illegal.
000B AL 0
001B AL 1
010B AL 2
011B AL 3
100B AL 4
101B AL 5
110B AL 6
Nominal Termination Resistance of ODT
Note: See Table 18 âODT DC Electrical Characteristicsâ on Page 20
00B RTT â (ODT disabled)
01B RTT 75 Ohm
10B RTT 150 Ohm
11B RTT 50 Ohm
Off-chip Driver Impedance Control
0B DIC Full (Driver Size = 100%)
1B DIC Reduced
DLL Enable
0B DLL Enable
1B DLL Disable
Rev. 1.20, 2007-06
12
11232006-QP6X-6EM0
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