EM6AA320-XXMS ETRON [Etron Technology, Inc.], EM6AA320-XXMS Datasheet - Page 6

• Manufacturer Part Number: EM6AA320-XXMS
• Description: 8M x 32 DDR SDRAM
• Manufacturer: ETRON [Etron Technology, Inc.]

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
BA1
A6
0
•
•
•
•
•
0
0
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
t
CAC
All other Reserved
Burst Length
(min)
Register Mode
A11
A4
0
1
0
2
4
8
EMRS
MRS
≦
CAS# Latency X t
A10
CAS Latency
Reserved
A2
X
X
X
X
X
X
3 clocks
4 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
8Mx32 DDR SDRAM
DLL
A8
A8
0
1
0
CK
A0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
A7
TM
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
Test Mode
Reset DLL
A6
Normal
0, 1
1, 0
Mode
CAS Latency
A2
A5
0
0
0
1
EM6AA320-XXMS
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
A3
BT
A3
A0
Rev 0.7
0
1
1
0
1
1
0, 1
1, 0
Full Page (Sequential)
Sequential
Interleave
A2
Type
Burst Length
Burst Lenght
A1
2
4
8
May. 2006
A0