D a t a S h e e t ( P r e l i m i n a r y )
9.12.1
Release from Deep Power Down and Read Electronic Signature (RES)
The device features an 8-bit Electronic Signature, which can be read using the RES command. See
Figure 9.13 and Table 9.4 for the command sequence and signature value. The Electronic Signature is not to
be confused with the identification data obtained using the RDID command. The device offers the Electronic
Signature so that it can be used with previous devices that offered it; however, the Electronic Signature
should not be used for new designs, which should read the RDID data instead.
After the host system drives CS# low, it must write the RES command followed by 3 dummy bytes to SI (each
bit is latched on SI during the rising edge of SCK). The Electronic Signature is then output on SO; each bit is
shifted out on the falling edge of SCK. The RES operation is terminated by driving CS# high after the
Electronic Signature is read at least once. Additional clock cycles on SCK with CS# low cause the device to
output the Electronic Signature repeatedly.
When CS# is driven high, the device transitions from DP mode to the standby mode after a delay of tRES, as
previously described. The RES command always provides access to the Electronic Signature of the device
and can be applied even if DP mode has not been entered.
Any RES command issued while an erase, program, or WRSR operation is in progress not executed, and the
operation continues uninterrupted.
Figure 9.13 Release from Deep Power Down and
Read Electronic Signature (RES) Command Sequence
CS#
2
28 29 30
31 32 33 34
1
8
36 37
9
35
38
0
3
4
5
6
7
10
SCK
t
RES
3 Dummy Bytes
Command
SI
3
1
0
2
23 22
MSB
21
Hi-Z
7
6
5
4
3
2
1
SO
0
MSB
Electronic ID out
Standby Mode
Deep Power-down Mode
Table 9.4 Command Definitions
One-Byte
Address
Bytes
Dummy
Byte
Operation
Command
READ
FAST_READ
RDID
Description
Command Code
03H (0000 0011)
0BH (0000 1011)
9FH (1001 1111)
06H (0000 0110)
04H (0000 0100)
D8H (1101 1000)
C7H (1100 0111)
02H (0000 0010)
05H (0000 0101)
01H (0000 0001)
B9H (1011 1001)
ABH (1010 1011)
Data Bytes
Read Data Bytes
3
3
0
0
0
3
0
3
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
1 to ∞
Read
Read Data Bytes at Higher Speed
Read Identification (Note 1)
Write Enable
1 to ∞
1 to 3
WREN
WRDI
SE
0
Write Control
Write Disable
0
Sector Erase
0
Erase
Program
BE
Bulk (Chip) Erase
0
PP
Page Program
1 to 256
RDSR
WRSR
DP
Read from Status Register
Write to Status Register
Deep Power Down
1 to ∞
Status Register
1
0
0
Release from Deep Power Down
Power Saving
RES
Release from Deep Power Down and
Read Electronic Signature (Note 2)
ABH (1010 1011)
0
3
1 to ∞
Notes
1. The S25FL032A has a manufacturer ID of 01h, and a device ID consisting of the memory type (02h) and the memory capacity (15h).
2. The S25FL032A has an Electronic Signature ID of 15h.
26
S25FL032A
S25FL032A_00_C0 September 1, 2006
SPANSION [ SPANSION ]
