S25FL064A Meet Spansion Inc., S25FL064A Datasheet - Page 16

• Manufacturer Part Number: S25FL064A
• Description: 64 Megabit Cmos 3.0 Volt Flash Memory With 50 Mhz Spi Bus Interface
• Manufacturer: Meet Spansion Inc.

9.2
June 29, 2007 S25FL064A_00_C3
Read Data Bytes at Higher Speed (FAST_READ)
The FAST_READ command reads data from the memory array at the frequency (f
input, with a maximum speed of 50 MHz. The host system must first select the device by driving CS# low. The
FAST_READ command is then written to SI, followed by a 3-byte address (A23-A0) and a dummy byte. Each
bit is latched on the rising edge of SCK. The memory array data, at that address, are output serially on SO at
a frequency f
The FAST_READ command sequence is shown in
specified can be at any location. The device automatically increments to the next higher address after each
byte of data is output. The entire memory array can therefore be read with a single FAST_READ command.
When the highest address is reached, the address counter reverts to 00000h, allowing the read sequence to
continue indefinitely.
The FAST_READ command is terminated by driving CS# high at any time during data output. The device
rejects any FAST_READ command issued while it is executing a program, erase, or Write Status Register
operation, and continues the operation uninterrupted.
SCK
SO
CS#
SI
Mode 3
Mode 0
Hi-Z
Figure 9.2 Read Data Bytes at Higher Speed (FAST_READ) Command Sequence
SCK
0
, on the falling edge of SCK.
1
2
Command
3
D a t a
4
5
6
7
23 22 21
S h e e t
8
9
24-Bit Address
S25FL064A
10
28 29 30
3
2
1
Figure 9.2
31 32 33
0
7
6
Dummy Byte
34 35 36 37 38
5
and
4
3
Table 9.4 on page
2
1
39
0
MSB
7
40 41
6
5
42 43 44 45
DATA OUT 1
SCK
4
) presented at the SCK
28. The first byte
3
2
1
46
0
47
MSB
7
DATA OUT 2
17