EN25QH32A Datasheet, PDF (46/63 Pages) Eon Silicon Solution Inc. – 32 Megabit Serial Flash Memory with 4Kbyte Uniform Sector

Read SFDP Mode and Unique ID Number (5Ah)
EN25QH32A
Read SFDP Mode
EN25QH32A 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 30. 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 30. Read SFDP Mode and Unique ID Number Instruction Sequence Diagram
This Data Sheet may be revised by subsequent versions
46
or modifications due to changes in technical specifications.
©2013 Eon Silicon Solution, Inc.,
Rev. A, Issue Date: 2013/11/25
www.eonssi.com