ENA2163 Datasheet, PDF (13/22 Pages) ON Semiconductor – Serial Flash Memory

LE25U40CQE
11. Silicon ID Read
ID read is an operation that reads the manufacturer code and device ID information. The silicon ID read command is not
accepted during writing. There are two methods of reading the silicon ID, each of which is assigned a device ID. In the
first method, the read command sequence consists only of the first bus cycle in which (9Fh) is input. In the subsequent
bus cycles, the manufacturer code 62h which is assigned by JEDEC, 2-byte device ID code (memory type, memory
capacity), and reserved code are output sequentially. The 4-byte code is output repeatedly as long as clock inputs are
present, "Table 7-1 JEDEC ID code " lists the silicon ID codes and "Figure 16-a JEDEC ID read" shows the JEDEC ID
read timing waveforms.
The second method involves inputting the ID read command. This command consists of the first through fourth bus
cycles, and the one bite silicon ID can be read when 24 dummy bits are input after (ABh). "Table 7-2 ID code " lists the
silicon ID codes and "Figure 16-b ID read" shows the ID read timing waveforms.
If the SCK input persists after a device code is read, that device code continues to be output. The data output is
transmitted starting at the falling edge of the clock for bit 0 in the fourth bus cycle and the silicon ID read sequence is
finished by setting CS high.
Table 7-1 JEDEC ID code
Manufacturer code
2 byte device ID
Memory type
Memory capacity code
Device code
1
Output code
62h
06h
13h(4M Bit)
00h
Table 7-2 ID code
1 byte device ID
Output Code
6E
(LE25U40C)
Figure 16-a JEDEC ID Read
CS
SCK
SI
Mode3
Mode0
0 1 2 3 4 5 6 7 8 15 16 23 24 31 32 39
8CL
9Fh
High Impedance
SO
62h 06h
13h
00h 62h
MSB MSB MSB MSB MSB
Figure 16-b ID Read
CS
SCK
SI
Mode3
Mode0
0 1 2 3 4 5 6 7 8 15 16 23 24 31 32 39
8CL
ABh
X
X
X
High Impedance
SO
6Eh 6Eh
MSB MSB
No.A2163-13/22