전자부품 데이터시트 검색엔진 |
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GD25D20C 데이터시트(PDF) 21 Page - GigaDevice Semiconductor (Beijing) Inc. |
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GD25D20C 데이터시트(HTML) 21 Page - GigaDevice Semiconductor (Beijing) Inc. |
21 / 43 page 3.3V Uniform Sector Standard and Dual Serial Flash GD25D40C/20C 21 Mode. The Deep Power-Down (DP) command is entered by driving CS# low, followed by the command code on SI. CS# must be driven low for the entire duration of the sequence. The Deep Power-Down command sequence: CS# goes low sending Deep Power-Down command CS# goes high. The command sequence is shown in Figure13. CS# must be driven high after the eighth bit of the command code has been latched in; otherwise the Deep Power-Down (DP) command is not executed. As soon as CS# is driven high, it requires a delay of tDP before the supply current is reduced to ICC2 and the Deep Power-Down Mode is entered. Any Deep Power- Down (DP) command, while an Erase, Program or Write cycle is in progress, is rejected without having any effects on the cycle that is in progress. Figure13. Deep Power-Down Sequence Diagram 7.14. Release from Deep Power-Down / Read Device ID (ABH) The Release from Power-Down and Read Device ID command is a multi-purpose command, which can be used to release the device from the Power-Down state or obtain the devices electronic identification (ID) number. When used to release the device from the Power-Down state, the command is issued by driving the CS# pin low, shifting the instruction code “ABH” and driving CS# high as shown in Figure14. Release from Power-Down will take the time duration of tRES1 (See AC Characteristics) before the device will resume normal operation and other c omm and are accepted. The CS# pin must keep high during the tRES1 time duration. When used only to obtain the Device ID while not in the Power-Down state, the command is initiated by driving the CS# pin low and shifting the instruction code “ABH” followed by 3-dummy byte. The Device ID bits are then shifted out on the falling edge of SCLK with most significant bit (MSB) first as shown in Figure15. The Device ID value for the GD25D40C/20C is listed in Manufacturer and Device Identification table. The Device ID can be read continuously. The command is completed by driving CS# high. When used to release the device from the Power-Down state and obtain the Device ID, the command is the same as previously described, and shown in Figure15, except that after CS# is driven high it must remain high for a time duration of tRES2 (See AC Characteristics). After this time duration the device will resume normal operation and other command will be accepted. If the Release from Power-Down and Read Device ID command is issued while an Erase, Program or Write cycle is in process (when WIP equal 1) the command is ignored and will not have any effects on the current cycle. Figure14. Release Power-Down Sequence Diagram Command 0 1 2 3 4 5 6 7 B9H CS# SCLK SI tDP Deep Power-down mode Command 0 1 2 3 4 5 6 7 ABH CS# SCLK SI RES1 Stand-by mode Deep Power-down mode t |
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