IS25WP064A-RBLE datasheet(37/111 Pages) ISSI

37 / 111 page

IS25WP064A/032A

Integrated Silicon Solution, Inc.- www.issi.com

Rev. 00D

03/01/2016

8.6 FAST READ QUAD OUTPUT OPERATION (FRQO, 6Bh)

The FRQO instruction is used to read memory data on four output pins each at up to a 133 MHz clock.

The FRQO instruction code is followed by three address bytes (A23

– A0) and dummy cycles

(configurable, default is 8 clocks), transmitted via the IO0 line, with each bit latched-in during the rising

edge of SCK. Then the first data byte addressed is shifted out on the IO3, IO2, IO1 and IO0 lines, with

each group of four bits shifted out at a maximum frequency fCT, during the falling edge of SCK. The first

bit (MSB) is output on IO3, while simultaneously the second bit is output on IO2, the third bit is output on

IO1, etc.

The first byte addressed can be at any memory location. The address is automatically incremented after

each byte of data is shifted out. When the highest address is reached, the address counter will roll over

to the 000000h address, allowing the entire memory to be read with a single FRQO instruction. FRQO

instruction is terminated by driving CE# high (VIH).

If a FRQO instruction is issued while an Erase, Program or Write cycle is in process (BUSY=1) the

instruction is ignored and will not have any effects on the current cycle.

IS25WP064A-RBLE Datasheet(PDF) 37 Page - Integrated Silicon Solution, Inc