MX23L12854 Macronix International, MX23L12854 Datasheet - Page 7

• Manufacturer Part Number: MX23L12854
• Description: 128M-BIT Low Voltage / Serial Mask ROM Memory with 50MHz SPI Bus Interface
• Manufacturer: Macronix International

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DataSheet
4
Figure 4. Read Data Bytes (READ) Instruction Sequence and Data-Out Sequence
P/N: PM1141
Read Data Bytes (READ)
The device is first selected by driving Chip Select (S#) 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
(C). Then the memory contents, at that address, is shifted
out on Serial Data Output (Q), each bit being shifted out, at
a maximum frequency fR, during the falling edge of Serial
Clock (C).
The instruction sequence is shown in Figure 4. 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 (S#) High. Chip Select (S#) can be
driven High at any time during data output.
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S#
C
D
Q
0
1
High Impedance
2
Instruction
3
4
5
6
7
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MSB
23
8
22 21
9 10
24-Bit Address
7
3
28 29 30 31 32 33 34 35
2
1
0
MSB
7
6
MX23L12854
5
Data Out 1
4
3
36 37 38
2
1
0
39
7
Data Out 2
REV. 1.1, MAY. 04, 2005