EM6A9320 Etron Technology Inc., EM6A9320 Datasheet - Page 6

• Manufacturer Part Number: EM6A9320
• Description: 4M x 32 DDR SDRAM
• Manufacturer: Etron Technology Inc.

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Mode Register Set (MRS)
The mode register is divided into various fields depending on functionality.
Mode Resistor Bitmap
Burst Definition, Addressing Sequence of Sequential and Interleave Mode
Etron Confidential
BA1
A6
0
•
•
•
•
•
0
0
1
1
Burst Length Field (A2, A1, A0)
This field specifies the data length of column access and selects the Burst Length.
Addressing Mode Select Field (A3)
The Addressing Mode can be Interleave Mode or Sequential Mode. Both Sequential Mode and
Interleave Mode support burst length of 2, 4 and 8. Full page burst length is only for Sequential mode.
CAS# Latency Field (A6, A5, A4)
This field specifies the number of clock cycles from the assertion of the Read command to the first read
data. The minimum whole value of CAS# Latency depends on the frequency of CK. The minimum whole
value satisfying the following formula must be programmed into this field.
Test Mode field :A7; DLL Reset Mode field : A8
These two bits must be programmed to "00" in normal operation.
( BA0, BA1)
Mode RFU must be set to “0”
BA0
BA0
A5
0
1
1
1
0
0
t
CAC
All other Reserved
Burst Length
(min)
Register Mode
A11
A4
0
1
0
1
2
4
8
EMRS
MRS
CAS# Latency X t
A10
CAS Latency
Reserved
A2
X
X
X
X
X
X
3 clocks
4 clocks
5 clocks
0
0
0
0
1
1
1
1
Start Address
A9
A1
X
X
0
0
1
1
0
0
1
1
0
0
1
1
DLL
A8
A8
0
1
0
CK
A0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
4Mx32 DDR SDRAM
TM
A7
A7
0
0
1
0, 1, 2, 3, 4, 5, 6, 7
1, 2, 3, 4, 5, 6, 7, 0
2, 3, 4, 5, 6, 7, 0, 1
3, 4, 5, 6, 7, 0, 1, 2
4, 5, 6, 7, 0, 1, 2, 3
5, 6, 7, 0, 1, 2, 3, 4
6, 7, 0, 1, 2, 3, 4, 5
7, 0, 1, 2, 3, 4, 5, 6
6
Sequential
0, 1, 2, 3
1, 2, 3, 0
2, 3, 0, 1
3, 0, 1, 2
Reset DLL
Test Mode
A6
Normal
0, 1
1, 0
Mode
CAS Latency
A5
A2
0
0
0
1
A4
A1
0
1
1
1
0, 1, 2, 3, 4, 5, 6, 7
1, 0, 3, 2, 5, 4, 7, 6
2, 3, 0, 1, 6, 7, 4, 5
3, 2, 1, 0, 7, 6, 5, 4
4, 5, 6, 7, 0, 1, 2, 3
5, 4, 7, 6, 1, 0, 3, 2
6, 7, 4, 5, 2, 3, 0, 1
7, 6, 5, 4, 3, 2, 1, 0
All other Reserved
Interleave
0, 1, 2, 3
1, 0, 3, 2
2, 3, 0, 1
3, 2, 1, 0
BT
A3
A3
A0
Rev 0.3
0
1
1
0
1
1
0, 1
1, 0
EM6A9320
Full Page (Sequential)
Sequential
Interleave
A2
Type
Burst Length
Burst Lenght
A1
2
4
8
July. 2002
A0