IS42S32160B-6BL ISSI [Integrated Silicon Solution, Inc], IS42S32160B-6BL Datasheet - Page 23

• Manufacturer Part Number: IS42S32160B-6BL
• Description: 16M x 32 512Mb SYNCHRONOUS DRAM
• Manufacturer: ISSI [Integrated Silicon Solution, Inc]

IS42S32160B, IS45S32160B
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
Rev. 00B
07/01/09
BA1 BA0
A12
Reserved
A11 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
1
1
0
0
1
1
0
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 theWRITE burst mode, and M10, M11,
and M12 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.
A5
0
1
0
1
0
1
0
1
A4
Burst Type
CAS Latency
M3
0
1
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
A3
2
3
1. To ensure compatibility with future devices,
Interleaved
Sequential
should program BA1, BA0, A12, A11, A10 = "0"
Burst Length
A2
Type
M2 M1 M0
0
0
0
0
1
1
1
1
A1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
A0
Reserved Reserved
Reserved Reserved
Reserved Reserved
Full Page
Address Bus
Mode Register (Mx)
M3=0
1
2
4
8
Reserved
M3=1
1
2
4
8
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