S25FL128K Meet Spansion Inc., S25FL128K Datasheet - Page 47

• Manufacturer Part Number: S25FL128K
• Description: 128-mbit Cmos 3.0 Volt Flash Memory With 104-mhz Spi Serial Peripheral Interface Multi I/o Bus
• Manufacturer: Meet Spansion Inc.

April 1, 2011 S25FL128K_00_02
6.2.32
Read SFDP Register (5Ah)
The S25FL128K features a 256-Byte Serial Flash Discoverable Parameter (SFDP) register that contains
information about devices operational capability such as available commands, timing and other features. The
SFDP parameters are stored in one or more Parameter Identification (PID) tables. Currently only one PID
table is specified but more may be added in the future. The Read SFDP Register instruction is compatible
with the SFDP standard initially established in 2010 for PC and other applications.
The Read SFDP instruction is initiated by driving the CS# pin low and shifting the instruction code “5Ah”
followed by a 24-bit address (A23-A0)(1) into the SI pin. Eight “dummy” clocks are also required before the
SFDP register contents are shifted out on the falling edge of the 40th CLK with most significant bit (MSB) first
as shown in
table.
Note: A23-A8 = 0; A7-A0 are used to define the starting byte address for the 256-Byte SFDP Register.
CLK
CLK
CS#
CS#
Byte Address
SO
SO
SI
SI
00h
01h
02h
03h
04h
05h
06h
07h
08h
Mode 3
Mode 0
= MSB
D a t a
Figure
32
Table 6.9 Serial Flash Discoverable Parameter Definition Table (Sheet 1 of 2)
0
33 34 35
Data
53h
46h
44h
50h
01h
01h
00h
FFh
EFh
6.38. For SFDP register values and descriptions, refer to the following SFDP Definition
1
Dummy Byte
Figure 6.38 Read SFDP Register Instruction Sequence Diagram
S h e e t
Instruction (5Ah)
2
3
SFDP Signature
SFDP Signature
SFDP Signature
SFDP Signature
SFDP Minor Revisions
SFDP Major Revisions
Number of Parameter Headers (NPH)
Reserved
PID (3)(0): Manufacturer JEDEC ID
36 37
4
( P r e l i m i n a r y )
5
38 39 40 41
6
S25FL128K
7
7
23
8
6
Description
22 21
9
5
42 43
Data Out 1
24-bit Address
10
4
3
3
44 45 46
28 29
2
2
1
1
30 31
0
47
0
7
6
5
Data Out 2
SFDP Signature = 50444653h
4
1 Parameter Header
3
SFDP revision 1.1
Comment
2
EFh
1
0
7
47