n25q256 Numonyx, n25q256 Datasheet - Page 72

• Manufacturer Part Number: n25q256
• Description: 256-mbit 3 V, Multiple I/o, 4-kbyte Subsector Erase, Xip Enabled, Serial Flash Memory With 108 Mhz Spi Bus Interface
• Manufacturer: Numonyx

Instructions
9.1.8
72/186
DQ0
DQ0
DQ1
DQ1
C
S
C
S
Mode 3
Mode 2
Dual Output Fast Read using 4 Byte Address (DOFR4BYTE)
The Dual Output Fast Read using 4 bytes address (DOFR4BYTE) instruction is very similar
to the Read Data Bytes at Higher Speed using 4 bytes address (FAST_READ4BYTE)
instruction, except that the data are shifted out on two pins (pin DQ0 and pin DQ1) instead
of only one. Outputting the data on two pins instead of one doubles the data transfer
bandwidth compared to the Read Data Bytes at Higher Speed using 4 bytes address
(FAST_READ4BYTE) instruction.
The device is first selected by driving Chip Select (S) Low. The instruction code is followed
by a 4-byte address (A31-A0) and a dummy byte, each bit being latched-in during the rising
edge of Serial Clock (C). Then the memory contents, at that address, are shifted out on DQ0
and DQ1 at a maximum frequency Fc, during the falling edge of Serial Clock (C).
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 on DQ0 and DQ1. The whole
memory can, therefore, be read with a instruction.
When the highest address is reached, the address counter rolls over to 00000000h, so that
the read sequence can be continued indefinitely.
EAR becomes 'don't care' while the instruction code is executed, and neither FSR<0> not
NVCR<0> are modified by this command, so the addressing mode returns in the formerly
selected mode after the operation is completed.
Figure 25. Dual Output Fast Read using 4 Byte Address Instruction and Data-Out
40 41 42
Dummy cycles
0
43
Sequence
1
44 45 46 47 48 49 50 51 52 53 54
2
Instruction
High Impedance
3
4
MSB
5
6
7
DATA OUT 1
6
4
5
7
2
3
31 30 29
8
0
1
MSB
9 10
6
7
DATA OUT 2
32-bit Address
Micron Technology, Inc., reserves the right to change products or specifications without notice.
4
5
2
3
3
36 37 38 39
0
1
55
2
MSB
6
7
DATA OUT 3
1
4
5
0
2
3
0
1
MSB
©2010 Micron Technology, Inc. All rights reserved.
6
7
DATA OUT n
4
5
2
3
0
1
MSB
N25Q256 - 3 V