Fremont Micro Devices Preliminary FT25L04/02
© 2014 Fremont Micro Devices Inc. Confidential Rev1.0 DS25L04/02-page11
7. COMMANDS DESCRIPTION
All commands, addresses and data are shifted in and out of the device, beginning with the most
significant bit on the first rising edge of SCLK after CS# is driven low. Then, the one-byte command code must
be shifted in to the device, most significant bit first on SI, each bit being latched on the rising edges of SCLK.
See Table2, every command sequence starts with a one-byte command code. Depending on the
command, this might be followed by address bytes, or by data bytes, or by both or none. CS# must be driven
high after the last bit of the command sequence has been shifted in. For the command of Read, Fast Read,
Read Status Register, and Read Device ID, the shifted-in command sequence is followed by a data-out
sequence. CS# can be driven high after any bit of the data-out sequence is being shifted out.
For the command of Page Program, Sector Erase, Block Erase, Chip Erase, Write Status Register, Write
Enable, Write Disable, CS# must be driven high exactly at a byte boundary, otherwise the command is
rejected. That is CS# must driven high when the number of clock pulses after CS# being driven low is an
exact multiple of eight. For Page Program, if at any time the input byte is not a full byte, nothing will happen
and WEL will not be reset.
Table2. Commands
Command Name
Byte1 Byte2 Byte3 Byte4 Byte5 Byte6 n-Bytes
Write Enable 06H
Write Disable 04H
Read Status Register 05H (S7-S0) (continuous)
Write Status Register 01H (S7-S0) (continuous)
Read Data 03H A23-A16 A15-A8 A7-A0 (D7-D0) (Next byte) (continuous)
Fast Read 0BH A23-A16 A15-A8 A7-A0 dummy (D7-D0) (continuous)
Page Program 02H A23-A16 A15-A8 A7-A0 (D7-D0) (Next byte)
Sector Erase 20H A23-A16 A15-A8 A7-A0
Block Erase D8H A23-A16 A15-A8 A7-A0
Chip Erase C7/60H
Manufacturer/Device ID 90H dummy dummy 00H
(MID7-MID0) (DID7-DID0)
(continuous)
Read Identification 9FH
(MID7-MID0)
(JDID15-JDI
D8)
(JDID7-JDID
0)
(continuous)
