n25q256 Numonyx, n25q256 Datasheet - Page 76

• 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
9.1.12
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Quad Output Fast Read using 4 Byte Address (QOFR4BYTE)
The Quad Output Fast Read using 4 bytes address (QOFR4BYTE) instruction is very
similar to the Dual Output Fast Read using 4 bytes address (DOFR4BYTE) instruction,
except that the data are shifted out on four pins (pin DQ0, pin DQ1, pin W/VPP/DQ2 and pin
HOLD/DQ3 (1) instead of only two. Outputting the data on four pins instead of one doubles
the data transfer bandwidth compared to the Dual Output Fast Read using 4 bytes address
(DOFR4BYTE) instruction.
The device is first selected by driving Chip Select (S) Low. The instruction code for 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 pin DQ0, pin DQ1, pin W/VPP/DQ2 and pin HOLD/DQ3 (1) 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 pin DQ0, pin DQ1, pin
W/VPP/DQ2 and pin HOLD/DQ3 (1). The whole memory can, therefore, be read with a
single 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. Reset functionality is available instead of
Hold in devices with a dedicated part number as explained under Ordering Information.
Micron Technology, Inc., reserves the right to change products or specifications without notice.
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N25Q256 - 3 V