E S I
E S I
ADVANCED INFORMATION
Excel Semiconductor inc.
CS#
0
0
1
2
3
4
5
6
7
8
9
10
28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
SCK
SI
Dummy Byte
24-Bit Address
Instruction
3
0
7
6
5
4
3
2
1
0
23
1
22 21
2
1
0
0
0
1
0
1
MSB
Data Out 2
7
Data Out 1
High Impedance
7
4
3
2
1
0
6
5
SO
MSB
Figure 10. Read Data Bytes at Higher Speed (FAST_READ) Instruction Sequence
This is followed by the 24-bit device identification,
stored in the memory, being shifted out on Serial
Read Identification (RDID)
Data Output (SO), with each bit being shifted out
during the falling edge of Serial Clock (SCK).
The Read Identification (RDID) instruction allows the
8-bit manufacturer identification to be read, followed
by two bytes of the device identification.
The instruction sequence is shown in Figure 11.
The manufacturer identification byte is assigned by
JEDEC, and has a value of 4Ah for ESI products.
The device identification is assigned by the device
manufacturer, and indicates the memory type in the
first byte (20h), and the memory capacity of the
device in the second byte (14h).
Driving CS# high after the Device Identification has
been read at least once terminates the READ_ID
instruction. The Read Identification (RDID) instruc-
tion can also be terminated by driving CS# High at
any time during data output. When Chip Select
(CS#) is driven High, the device is put in the Stand-
by Power mode. Once in the Stand-by Power
mode, the device waits to be selected, so that it can
receive, decode and execute instructions
Any Read Identification (RDID) instruction executed
while an Erase, Program, or Write Status Register
cycle is in progress is not decoded, and has no
effect on the cycle that is in progress.
Manufacturer
Identification
Device Identification
The device is first selected by driving Chip Select
(CS#) Low. Then, the 8-bit instruction code for the
instruction is shifted in, with each bit being latched in
on SI during the rising edge of SCK.
Memory Type Memory Capacity
4Ah
20h
14h
16
Rev. 0D May, 11, 2006
ES25P80
EXCELSEMI [ EXCEL SEMICONDUCTOR INC. ]
