W971GG6JB-25 Winbond Electronics, W971GG6JB-25 Datasheet - Page 15

• Manufacturer Part Number: W971GG6JB-25
• Description: IC DDR2-800 SDRAM 1GB 84-WBGA
• Manufacturer: Winbond Electronics

Specifications of W971GG6JB-25

• Format - Memory: RAM
• Memory Type: DDR2 SDRAM
• Memory Size: 1G (64M x 16)
• Speed: 2.5ns
• Interface: Parallel
• Voltage - Supply: 1.7 V ~ 1.9 V
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 84-WBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q5804012

7.2.3
DDR2 SDRAM supports driver calibration feature and the flow chart in Figure 6 is an example of the
sequence. Every calibration mode command should be followed by “OCD calibration mode exit”
before any other command being issued. MRS should be set before entering OCD impedance
adjustment and On Die Termination (ODT) should be carefully controlled depending on system
environment.
EMRS: OCD calibration mode exit
EMRS: OCD calibration mode exit
Off-Chip Driver (OCD) Impedance Adjustment
DQ &DQS High; DQS Low
BL=4 code input to all DQs
Enter Adjust Mode
EMRS: Drive(1)
Inc, Dec or NOP
EMRS:
Start
Test
Need Calibration
Figure 6 – OCD Impedance Adjustment Flow Chart
ALL OK
All MR shoud be programmed before entering OCD impedance adjustment and ODT should
be carefully controlled depending on system environment
EMRS: OCD calibration mode exit
EMRS: OCD calibration mode exit
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End
ALL OK
EMRS: OCD calibration mode exit
Publication Release Date: Mar. 28, 2011
EMRS: OCD calibration mode exit
BL=4 code input to all DQs
DQ &DQS Low; DQS High
Enter Adjust Mode
Inc, Dec or NOP
EMRS: Drive(0)
EMRS:
Test
W971GG6JB
Need Calibration
Revision A07