S25FL129P Meet Spansion Inc., S25FL129P Datasheet - Page 26

• Manufacturer Part Number: S25FL129P
• Description: 128-mbit Cmos 3.0 Volt Flash Memory With 104-mhz Spi Serial Peripheral Interface Multi I/o Bus
• Manufacturer: Meet Spansion Inc.

9.1
26
Read Data Bytes (READ)
The Read Data Bytes (READ) command reads data from the memory array at the frequency (f
the SCK input, with a maximum speed of 40 MHz. The host system must first select the device by driving CS#
low. The READ command is then written to SI, followed by a 3 byte address (A23-A0). 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
on the falling edge of SCK.
Figure 9.1
can start at any location of the memory array. 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 READ
command. When the highest address is reached, the address counter reverts to 00000h, allowing the read
sequence to continue indefinitely.
The READ command is terminated by driving CS# high at any time during data output. The device rejects any
READ command issued while it is executing a program, erase, or Write Registers operation, and continues
the operation uninterrupted.
CS#
SCK
SI
SO
Mode 3
Mode 0
Hi-Z
and
Table 9.1 on page 25
0
1
Command
2
Figure 9.1 Read Data Bytes (READ) Command Sequence
3
4
D a t a
5
6
detail the READ command sequence. The first address byte specified
S25FL129P
7
MSB
23 22 21
S h e e t
8
9
24 Bit Address
10
( P r e l i m i n a r y )
3 2 1 0
28
29
30
31 32 33 34 35 36 37 38 39
MSB
7 6 5
S25FL129P_00_04 November 2, 2009
Data Out 1
4
3 2 1 0 7
R
) presented at
Data Out 2
R
,