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AMS73CAG01408RAUJI9I Datasheet(PDF) 7 Page - Advanced Monolithic Systems Ltd

Part # AMS73CAG01408RAUJI9I
Description  HIGH PERFORMANCE 1Gbit DDR3 SDRAM
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Manufacturer  AMS [Advanced Monolithic Systems Ltd]
Direct Link   http://www.ams-semitech.com
Logo AMS - Advanced Monolithic Systems Ltd

AMS73CAG01408RAUJI9I Datasheet(HTML) 7 Page - Advanced Monolithic Systems Ltd

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AMS73CAG01808RA Rev. 1.0 December 2010
Mode Register MR0
The Mode Register MR0 stores the data for controlling various operating modes of DDR3 SDRAM. It con-
trols burst length, read burst type, CAS latency, test mode, DLL reset, WR and DLL control for precharge
power-down, which include various vendor specific options to make DDR3 SDRAM useful for various appli-
cations. The mode register is written by asserting low on CS, RAS, CAS, WE, BA0, BA1 and BA2, while
controlling the states of address pins according to the table below.
Address Field
A7
mode
0Normal
1Test
A3
Read Burst Type
0
Nibble Sequential
1Interleave
A8
DLL Reset
0No
1Yes
Mode Register 0
BA1
BA0
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
0
TM
CAS Latency
RBT
DLL
0*1
WR
Write recovery for autoprecharge
A11
A10
A9
WR(cycles)
00
0
Reserved
00
1
5*2
01
0
6*2
01
1
7*2
10
0
8*2
10
1
10*2
11
0
12*2
11
1
Reserved
A13
0
BL
A1
A0
BL
0
0
8 (Fixed)
0
1
4 or 8(on the fly)
1
0
4 (Fixed)
11
Reserved
*1 : BA2 and A13 are reserved for future use and must be programmed to 0 during MRS.
*2 : WR(write recovery for autoprecharge)min in clock cycles is calculated by dividing tWR(in ns) by tCK(in ns) and rounding up to the
next integer: WRmin[cycles] = Roundup(tWR[ns]/tCK[ns]). The WR value in the mode register must be programmed to be equal or
larger than WRmin. The programmed WR value is used with tRP to determine tDAL.
BA2
0*1
BA1
BA0
MRS mode
00
MR0
01
MR1
10
MR2
11
MR3
A12
PPD
A12
DLL Control for
Precharge PD
0
Slow exit (DLL off)
1
Fast exit (DLL on)
CAS Latency
A6
A5
A4
A2
Latency
00
0
0
Reserved
00
1
0
5
01
0
0
6
01
1
0
7
10
0
0
8
10
1
0
9
11
0
0
10
11
1
0
11(Optional for
DDR3-1600)
CL
AMS73CAG01808RA


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