GS4576S18GL-18I 参数 Datasheet PDF下载

GS4576S09/18L

Power–Up Initialization Flow Chart

Step

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

V

DD

and V

EXT

ramp

V

DDQ

ramp

Apply V

REF

and V

TT

Apply stable CK/CK and DK/DK

Wait at least 200s

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

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

MRS commands

must be on

consecutive

clock cycles

Voltage rails can

be applied

simultaneously

*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: 1.03 11/2013

8/63

© 2011, GSI Technology

Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.