A2505PM-F AMICC [AMIC Technology], A2505PM-F Datasheet - Page 17

• Manufacturer Part Number: A2505PM-F
• Description: 16 Mbit, Low Voltage, Serial Flash Memory With 85MHz SPI Bus Interface
• Manufacturer: AMICC [AMIC Technology]

Fast Read Dual Output (3Bh)
The Fast Read Dual Output (3Bh) instruction is similar to the
Fast_Read (0Bh) instruction except the data is output on two
pins, DO and DIO, instead of just DO. This allows data to be
transferred from the A25L16P at twice the rate of standard
SPI devices.
Similar to the Fast Read instruction, the Fast Read Dual
Output instruction can operate at the highest possible
frequency
Figure 10. FAST_READ_DUAL_OUTPUT Instruction Sequence and Data-Out Sequence
PRELIMINARY
DIO
DIO
of
DO
DO
S
S
C
C
f
C
Note: Address bits A23 to A21 are Don’t Care.
(April, 2007, Version 0.6)
(See
32 33 34 35 36 37 38 39
7
0 1
6 5 4
AC
High Impedance
Dummy Byte
2 3 4
Characteristics).
Instruction
3
2
5 6
1
0
7
MSB
40 41 42 43 44 45 46 47
6 4 2 0 6 4 2 0 6 4 2 0 6 4 2 0
7 5 3 1 7 5 3
MSB
This
23 22 21
DIO switches from input to output
8
Data Out 1
9
24-Bit Address
is
10
16
accomplished by adding eight “dummy” clocks after the
24-bit address as shown in figure 10. The dummy clocks
allow the device’s internal circuits additional time for setting
up the initial address. The input data during the dummy
clocks is “don’t care”. However, the DIO pin should be
high-impedance prior to the falling edge of the first data out
clock.
3 2 1
28 29 30 31
Data Out 2
1
0
0
MSB
7 5 3 1 7 5 3 1
Data Out 3
AMIC Technology Corp.
Data Out 4
A25L16P Series
MSB
7