MX23L12854 Macronix International, MX23L12854 Datasheet - Page 6

• 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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INSTRUCTIONS
All instructions, addresses and data are shifted in and out
of the device, most significant bit first.
Serial Data Input (D) is sampled on the first rising edge of
Serial Clock (C) after Chip Select (S#) is driven Low. Then,
the one-byte instruction code must be shifted in to the
device, most significant bit first, on Serial Data Input (D),
each bit being latched on the rising edges of Serial Clock
(C).
The instruction set is listed in Table 1.
Table 1. Instruction Set
P/N: PM1141
U
FAST_READ Read Data Bytes at Higher Speed
Instruction
.com
READ
Read Data Bytes
Description
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One-byte Instruction Code
0000 0011
0000 1011
6
Every instruction sequence starts with a one-byte instruc-
tion code. Depending on the instruction, this might be
followed by address bytes, or by data bytes, or by both or
none.
In the case of a Read Data Bytes (READ), Read Data
Bytes at Higher Speed (Fast_Read), the shifted-in instruc-
tion sequence is followed by a data-out sequence. Chip
Select (S#) can be driven High after any bit of the data-out
sequence is being shifted out.
03h
0Bh
MX23L12854
Address
Bytes
3
3
Dummy
Bytes
0
1
REV. 1.1, MAY. 04, 2005
Bytes
1 to
1 to
Data