EM6A9320 Просмотр технического описания (PDF) - Etron Technology
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EM6A9320 Datasheet PDF : 16 Pages
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Et r onT ec h
4Mx32 DDR SDRAM
EM6A9320
Mode Register Set (MRS)
The mode register is divided into various fields depending on functionality.
• 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.
tCAC(min) CAS# Latency X tCK
• Test Mode field :A7; DLL Reset Mode field : A8
These two bits must be programmed to "00" in normal operation.
• ( BA0, BA1)
Mode Resistor Bitmap
BA1 BA0 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
0 Mode RFU must be set to “0” DLL TM
CAS Latency
BT
Burst Lenght
BA0 Register Mode
0
MRS
1
EMRS
A8 A7
Mode
0
0
Normal
1
0 Reset DLL
0
1 Test Mode
A3
Type
0 Sequential
1 Interleave
A6 A5 A4
CAS Latency
0
1
0
Reserved
0
1
1
3 clocks
1
0
0
4 clocks
1
0
1
5 clocks
All other Reserved
A2 A1 A0
Burst Length
0
0
1
2
0
1
0
4
0
1
1
8
1
1
1 Full Page (Sequential)
All other Reserved
Burst Definition, Addressing Sequence of Sequential and Interleave Mode
Burst Length
2
4
8
Start Address
A2 A1 A0
XX0
XX1
X00
X01
X10
X11
000
001
010
011
100
101
110
111
Sequential
0, 1
1, 0
0, 1, 2, 3
1, 2, 3, 0
2, 3, 0, 1
3, 0, 1, 2
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
Interleave
0, 1
1, 0
0, 1, 2, 3
1, 0, 3, 2
2, 3, 0, 1
3, 2, 1, 0
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
Etron Confidential
6
Rev 0.3
July. 2002
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