EN25QH32
Read SFDP Mode and Unique ID Number (5Ah)
Read SFDP Mode
EN25QH32 features Serial Flash Discoverable Parameters (SFDP) mode. Host system can retrieve the
operating characteristics, structure and vendor specified information such as identifying information,
memory size, operating voltage and timing information of this device by SFDP mode.
The device is first selected by driving Chip Select (CS#) Low. The instruction code for the Read SFDP
Mode is followed by a 3-byte address (A23-A0) and a dummy byte, each bit being latched-in during the
rising edge of Serial Clock (CLK). Then the memory contents, at that address, is shifted out on Serial
Data Output (DO), each bit being shifted out, at a maximum frequency FR, during the falling edge of
Serial Clock (CLK).
The instruction sequence is shown in Figure 27. The first byte addressed can be at any location. The
address is automatically incremented to the next higher address after each byte of data is shifted out.
The whole memory can, therefore, be read with a single Serial Flash Discoverable Parameters (SFDP)
instruction. When the highest address is reached, the address counter rolls over to 0x00h, allowing the
read sequence to be continued indefinitely. The Serial Flash Discoverable Parameters (SFDP)
instruction is terminated by driving Chip Select (CS#) High. Chip Select (CS#) can be driven High at
any time during data output. Any Read Data Bytes at Serial Flash Discoverable Parameters (SFDP)
instruction, while an Erase, Program or Write cycle is in progress, is rejected without having any effects
on the cycle that is in progress.
Figure 27. Read SFDP Mode and Unique ID Number Instruction Sequence Diagram
This Data Sheet may be revised by subsequent versions
or modifications due to changes in technical specifications.
©2004 Eon Silicon Solution, Inc., www.eonssi.com
44
Rev. E, Issue Date: 2012/01/30
EON [ EON SILICON SOLUTION INC. ]
