ACE25AB400G

Serial NOR Flash Memory 4M bits 3.0V Dual I/O Serial Flash Memory with 4KB Uniform Sector

VER 1.1

12

Read Data Bytes At Higher Speed (Fast Read) (0BH)

The Read Data Bytes at Higher Speed (Fast Read) command is for quickly reading data out. It is followed

by a 3-byte address (A23-A0) and a dummy byte, each bit being latched-in during the rising edge of SCLK.

Then the memory content, at that address, is shifted out on SO, each bit being shifted out, at a Max

frequency fC, during the falling edge of SCLK. The first byte address can be at any location. The address

is automatically incremented to the next higher address after each byte of data is shifted out.

Dual Output Fast Read (3BH)

The Dual Output Fast Read command is followed by 3-byte address (A23-A0) and a dummy byte, each

bit being latched in during the rising edge of SCLK, then the memory contents are shifted out 2-bit per

clock cycle from SI and SO. The command sequence is shown in Figure 8. The first byte addressed can

be at any location. The address is automatically incremented to the next address after each byte of data is

shifted out.

Figure7. Read Data Bytes at Higher Speed Sequence Diagram

Figure8.Dual Output Fast Read Sequence Diagram