GS4576C09/18/36L
Power–Up Initialization Flow Chart
Step
VDD and VEXT ramp
VDDQ ramp
1
2
Voltage rails can
be applied
simultaneously
Apply VREF and VTT
3
4
Apply stable CK/CK and DK/DK
Wait at least 200s
5
6
Issue MRS command—A10–A17 must be Low
Issue MRS command—A10–A17 must be Low
Desired load mode register with A10–A17 Low
Assert NOP for tMRSC
MRS commands
must be on
consecutive
clock cycles
7
8
9
10
11
12
13
14
15
16
17
18
19
Issue AUTO REFRESH to bank 0
Issue AUTO REFRESH to bank 1
Issue AUTO REFRESH to bank 2
Issue AUTO REFRESH to bank 3
Issue AUTO REFRESH to bank 4
Issue AUTO REFRESH to bank 5
Issue AUTO REFRESH to bank 6
Issue AUTO REFRESH to bank 7
Wait 1024 NOP commands*
Valid command
*Note:
The sequence of the eight AUTO REFRESH commands (with respect to the 1024 NOP commands) does not matter. As is required for any
operation, tRC must be met between an AUTO REFRESH command and a subsequent VALID command to the same bank.
Rev: 1.04 11/2013
9/62
© 2011, GSI Technology
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
GSI [ GSI TECHNOLOGY ]
