IS42LS16800A ICSI [Integrated Circuit Solution Inc], IS42LS16800A Datasheet - Page 29

• Manufacturer Part Number: IS42LS16800A
• Description: 16Meg x 8, 8Meg x16 & 4Meg x 32 128-MBIT SYNCHRONOUS DRAM
• Manufacturer: ICSI [Integrated Circuit Solution Inc]

IS42S81600A, IS42S16800A, IS42S32400A
IS42LS81600A, IS42LS16800A, IS42LS32400A
REGISTER DEFINITION
Mode Register
The mode register is used to define the specific mode of
operation of the SDRAM. This definition includes the
selection of a burst length, a burst type, a CAS\ latency, an
operating mode and a write burst mode, as shown in MODE
REGISTER DEFINITION.
The mode register is programmed via the LOAD MODE
REGISTER command and will retain the stored information
until it is programmed again or the device loses power.
MODE REGISTER DEFINITION
Integrated Silicon Solution, Inc. — www.issi.com —
ADVANCED INFORMATION Rev. 00A
06/01/02
A11
Reserved
A10
Write Burst Mode
(1)
M9
0
1
A9
Mode
Programmed Burst Length
Single Location Access
Operating Mode
A8
M8 M7
— —
0
0
A7
Defined
M6-M0
—
Latency Mode
A6
M6 M5 M4
0
0
0
0
1
1
1
1
Mode
Standard Operation
All Other States Reserved
0
0
1
1
0
0
1
1
A5
0
1
0
1
0
1
0
1
1-800-379-4774
A4
Burst Type
Mode register bits M0-M2 specify the burst length, M3
specifies the type of burst (sequential or interleaved), M4- M6
specify the CAS latency, M7 and M8 specify the operating
mode, M9 specifies the WRITE burst mode, and M10 and
M11 are reserved for future use.
The mode register must be loaded when all banks are idle,
and the controller must wait the specified time before
initiating the subsequent operation. Violating either of these
requirements will result in unspecified operation.
CAS Latency
M3
0
1
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
A3
2
3
Interleaved
Sequential
1. To ensure compatibility with future devices,
A2
Burst Length
Type
should program M11, M10 = "0, 0"
M2
0
0
0
0
1
1
1
1
A1
M1
0
0
1
1
0
0
1
1
M0
0
1
0
1
0
1
0
1
A0
Reserved
Reserved
Reserved
Address Bus
Mode Register (Mx)
Full Page
M3=0
1
2
4
8
Reserved
Reserved
Reserved
Reserved
M3=1
1
2
4
8
ISSI
29
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