mt18lsdt12872a Micron Semiconductor Products, mt18lsdt12872a Datasheet - Page 22

• Manufacturer Part Number: mt18lsdt12872a
• Description: Synchronous Dram Module
• Manufacturer: Micron Semiconductor Products

Figure 8:
Figure 9:
Table 18:
Table 19:
PDF: 09005aef8088b1bf/Source: 09005aef808807ca
SD9_18C64_128X72AG.fm - Rev. C 6/05 EN
Mode
Memory area select code (two arrays)
Protection register select code
Current address read
Random address read
Sequential read
Byte write
Page write
SCL from Master
Data Output
from Transmitter
Data Output
from Receiver
EEPROM Device Select Code
The most significant bit (b7) is sent first
EEPROM Operating Modes
Definition of Start and Stop
Acknowledge Response From Receiver
SDA
SCL
RW Bit
1
0
1
1
0
0
Start
bit
512MB (SR), 1GB (DR): (x72, ECC) 168-Pin SDRAM UDIMM
V
V
V
V
IH
IH
IH
IH
WC
V
V
or V
or V
or V
or V
IL
IL
IL
IL
IL
IL
b7
1
0
Device Type Identifier
22
Bytes
≤ 16
≥ 1
1
1
1
b6
0
1
Start, device select, RW = 1
Start, device select, RW= 0, Address
Restart, device select, RW= 1
Similar to current or random address read
Start, device select, RW = 0
Start, device select, RW = 0
Micron Technology, Inc., reserves the right to change products or specifications without notice.
b5
1
1
Stop
bit
b4
0
0
8
Initial Sequence
SA2
SA2
b3
Serial Presence Detect
Chip Enable
©2002 Micron Technology, Inc. All rights reserved.
Acknowledge
SA1
SA1
b2
9
SA0
SA0
b1
RW
RW
RW
b0