f25l004a Elite Semiconductor Memory Technology Inc., f25l004a Datasheet - Page 18

• Manufacturer Part Number: f25l004a
• Description: 3v Only 4 Mbit Serial Flash Memory
• Manufacturer: Elite Semiconductor Memory Technology Inc.

ESMT
Read-Electronic-Signature (RES)
The RES instruction can be used to read the 8-bit Electronic Signature of the device on the SO pin. The RES instruction can provide
access to the Electronic Signature of the device (except while an Erase, Program or WRSR cycle is in progress), Any ERS instruction
executed while an Erase, Program or WRSR cycle is in progress is no decoded, and has no effect on the cycle in progress.
Figure 16 : Read-Electronic-Signature (RES)
JEDEC Read-ID
The JEDEC Read-ID instruction identifies the device as F25L004A and the manufacturer as ESMT. The device information can be read
from executing the 8-bit command,.9FH. Following the JEDEC Read-ID instruction, the 8-bit manufacturer’s ID, 8CH, is output from the
device. After that, a 16-bit device ID is shifted out on the SO pin. Byte1, 8CH, identifies the manufacturer as ESMT. Byte2, 20H,
identifies the memory type as SPI Flash. Byte3, 13H, identifies the device as F25L004A. The instruction sequence is shown in Figure17.
The JEDEC Read ID instruction is terminated by a low to high transition on CE at any time during data output. If no other command is
issued after executing the JEDEC Read-ID instruction, issue a 00H (NOP) command before going into Standby Mode ( CE =V
Figure 17 : Jedec Read ID Sequence
Elite Semiconductor Memory Technology Inc.
SCK
SO
CE
SCK
SI
SO
CE
SI
MODE0
MODE3
MODE3
MODE1
MSB
HIGH IMPENANCE
0
HIGH IMPENANCE
0 1 2 3 4 5 6 7 8 9
1
9F
2
3
AB
M SB
4
5
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
8C
6
7
MSB
Bit7
8
MSB
Bit6
9
Bit5
20
10
Register Out
Bit4
11
Status
Bit3
12
Publication Date: Jan. 2009
Revision: 1.6
Bit2
13
Bit1
13
14
Bit0
F25L004A
18/30
IH
).