T25S16AFEPR datasheet(63/74 Pages) HMSEMI

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Figure 7.41 Read Manufacturer/Device ID Dual I/O Instruction

Note:

1. The "Continuous Read Mode" bits M7-0 must be set to Fxh to be compatible with Fast Read Dual I/O instruction

7.5.15 Read Manufacturer / Device ID Quad I/O (94h)

The Read Manufacturer / Device ID Quad I/O instruction is an alternative to Read Manufacturer / Device

ID instruction that provides both the JEDEC assigned manufacturer ID and the specific device ID at 4 x

speeds.

The Read Manufacturer / Device ID Quad I/O instruction is similar to the Fast Read Quad I/O instruction.

The instruction is initiated by driving the CS# pin low and shifting the instruction code "94h" followed by a

24-bit address(A23-A0) of 000000h, 8-bit Continuous Read Mode Bits and then four clock dummy cycles, with

the capability to input the Address bits four bits per clock. After that, the Manufacturer ID and the Device ID

are shifted out four bits per clock on the falling edge of CLK with most significant bit (MSB) first as shown in

Figure 7.42. The Device ID values for

HM25Q128A are listed in Manufacturer and Device Identification table.

The Manufacturer and Device IDs can be read continuously, alternating from one to the other. The instruction

is completed by driving CS# high.

Figure 7.42 Read Manufacturer/Device ID Quad I/O Instruction

Note:

1. The "Continuous Read Mode" bits M7-0 must be set to Fxh to be compatible with Fast Read Quad I/O

instruction.

7.5.16 Read Unique ID Number (4Bh)

The Read Unique ID Number instruction accesses a factory-set read-only 64-bit number which is unique

to each

HM25Q128A

device. The ID number can be used in conjunction with user software methods to help

prevent copying or cloning of a system. The Read Unique ID instruction is initiated by driving the CS# pin low

and shifting the instruction code "4Bh" followed by four bytes dummy clocks. After that, the 64-bit ID is shifted

out on the falling edge of CLK as shown in Figure 7.43.

Figure 7.43 Read unique ID Number Instruction

7.5.17 Set Read Parameters (C0h)

In QPI mode, to accommodate a wide range of applications with different needs for either maximum read

frequency or minimum data access latency, “Set Read Parameters (C0h)” instruction can be used to configure

HM25Q128A

T25S16AFEPR Datenblatt(PDF) 63 Page - Shenzhen Huazhimei Semiconductor Co., Ltd