S25FL016A0LMAI000 SPANSION [SPANSION], S25FL016A0LMAI000 Datasheet - Page 23

• Manufacturer Part Number: S25FL016A0LMAI000
• Description: 16 Megabit CMOS 3.0 Volt Flash Memory with 50MHz SPI (Serial Peripheral Interface) Bus
• Manufacturer: SPANSION [SPANSION]

9.12
August 28, 2006 S25FL016A_00_C0
9.12.1
Release from Deep Power Down (RES)
Release from Deep Power Down and Read Electronic Signature (RES)
The device requires the Release from Deep Power Down (RES) command to exit the Deep Power Down
mode. When the device is in the Deep Power Down mode, all commands except RES are ignored.
The host system must drive CS# low and write the RES command to SI. CS# must be driven low for the entire
duration of the sequence. The command sequence is shown in
The host system must drive CS# high t
from DP mode to the standby mode after a delay of t
the device can execute any read or write command.
The device features an 8-bit Electronic Signature, which can be read using the RES command. See
Figure 9.13
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.
SCK
CS#
SO
SI
Hi-Z
Mode 3
Mode 0
D a t a
and
SCK
CS#
SI
SO
Table 9.4
Figure 9.12 Release from Deep Power Down (RES) Command Sequence
Mode 3
Mode 0
Hi-Z
S h e e t
Figure 9.11 Deep Power Down (DP) Command Sequence
for the command sequence and signature value. The Electronic Signature is not to
0
1
( P r e l i m i n a r y )
2
0
Command
RES(max)
S25FL016A
3
1
Deep Power-down Mode
4
2
after the 8-bit RES command byte. The device transitions
Command
5
3
RES
Standby Mode
4
6
(see
5
7
Table 16.1 on page
6
Figure 9.12
7
t DP
t
and
RES
Deep Power-down Mode
Table
25). In the standby mode,
Standby Mode
9.4.
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