EN25D16
Read Data Bytes (READ) (03h)
The device is first selected by driving Chip Select (CS#) Low. The instruction code for the Read Data
Bytes (READ) instruction is followed by a 3-byte address (A23-A0), 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 f , during the falling
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edge of Serial Clock (CLK).
The instruction sequence is shown in Figure 9. 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 Read Data Bytes (READ) instruction. When
the highest address is reached, the address counter rolls over to 000000h, allowing the read
sequence to be continued indefinitely.
The Read Data Bytes (READ) 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 (READ)
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 9. Read Data Instruction Sequence Diagram
Read Data Bytes at Higher Speed (FAST_READ) (0Bh)
The device is first selected by driving Chip Select (CS#) Low. The instruction code for the Read Data
Bytes at Higher Speed (FAST_READ) instruction 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 F , during the falling edge of Serial Clock (CLK).
R
The instruction sequence is shown in Figure 10. 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 shift-
ed out. The whole memory can, therefore, be read with a single Read Data Bytes at Higher Speed
(FAST_READ) instruction. When the highest address is reached, the address counter rolls over to
000000h, allowing the read sequence to be continued indefinitely.
The Read Data Bytes at Higher Speed (FAST_READ) 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 Higher Speed (FAST_READ) instruction, while an Erase, Program or Write cycle is in
progress, is rejected without having any effects on the cycle that is in progress.
This Data Sheet may be revised by subsequent versions
or modifications due to changes in technical specifications.
©2004 Eon Silicon Solution, Inc., www.essi.com.tw
15
Rev. B, Issue Date: 2008/06/23
EON [ EON SILICON SOLUTION INC. ]
