EPCQ-L Serial Configuration Devices Datasheet

ID 683710
Date 5/18/2018
Document Table of Contents

Fast Read Operation (Bh)

When you execute the fast read operation, you first shift in the fast read operation code, followed by a 4-byte addressing mode (A[31..0]), and dummy cycle(s) with each bit being latched-in during the rising edge of the DCLK signal. Then, the memory contents at that address is shifted out on DATA1 with each bit being shifted out at a maximum frequency of 100 MHz during the falling edge of the DCLK signal.

Figure 12. Fast Read Operation Timing Diagram

The first byte address can be at any location. The device automatically increases the address to the next higher address after shifting out each byte of data. When the device reaches the highest address, the address counter restarts at the beginning of the same die, allowing the read sequence to continue indefinitely. A complete device reading is done by executing the read operation:

  • two times for EPCQ-L512 devices
  • four times for EPCQ-L1024 devices

You can terminate the fast read operation by driving the nCS signal high at any time during data output. If the fast read operation is shifted in while an erase, program, or write cycle is in progress, the operation is not executed and does not affect the erase, program, or write cycle in progress.