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AMS73CAG01408RALJH7H Datasheet(PDF) 8 Page - Advanced Monolithic Systems Ltd

No. de pieza AMS73CAG01408RALJH7H
Descripción Electrónicos  HIGH PERFORMANCE 1Gbit DDR3 SDRAM
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Fabricante Electrónico  AMS [Advanced Monolithic Systems Ltd]
Página de inicio   http://www.ams-semitech.com
Logo AMS - Advanced Monolithic Systems Ltd

AMS73CAG01408RALJH7H Datasheet(HTML) 8 Page - Advanced Monolithic Systems Ltd

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AMS73CAG01808RA Rev. 1.0 December 2010
Mode Register MR1
The Mode Register MR1 stores the data for enabling or disabling the DLL, output driver strength, RTT_Nom
impedance, additive latency, write leveling enable, TDQS enable and Qoff.
The Mode Register 1 is written by asserting low on CS, RAS, CAS, WE, high on BA0, low on BA1 and BA2,
while controlling the states of address pins according to the table below.
Mode Register 1
Address Field
BA
1
BA
0
A
11
A
10
A
9
A
8
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
0
AL
0*1
0*1
A13
1
Rtt_Nom
A0
DLL Enable
0
Enable
1
Disable
* 1 : BA2, A8, A10 and A13 are reserved for future use (RFU) and must be programmed to 0 during MRS.
BA
2
0*1
A
12
Note : RZQ = 240 ohms
A5
A1
Output Driver Impedance Control
00
RZQ/6
01
RZQ/7
10
RZQ/TBD
11
RZQ/TBD
D.I.C DLL
Note : RZQ = 240 ohms
*3: In Write leveling Mode (MR1[bit7] = 1)
with MR1[bit12] = 1, all RTT_Nom settings
are allowed; in Write Leveling Mode
(MR1[bit7] = 1) with MR1[bit12] = 0, only
RTT_Nom settings of RZQ/2, RZQ/4 and
RZQ/6 are allowed.
*4: If RTT_Nom is used during Writes,
only the values RZQ/2,RZQ/4 and RZQ/6
are allowed.
A9 A6 A2
Rtt_Nom *3
00
0
ODT disabled
00
1
RZQ/4
01
0
RZQ/2
01
1
RZQ/6
10
0
RZQ/12*4
10
1
RZQ/8*4
1
1
0
Reserved
1
1
1
Reserved
A7
Write leveling enable
0
Disabled
1
Enabled
A4
A3
Additive Latency
0
0
0 (AL disabled)
01
CL-1
10
CL-2
11
Reserved
*2: Outputs disabled - DQs, DQSs, DQSs.
A12
Qoff *2
0
Output buffer enabled
1
Output buffer disabled *2
Qoff
Level
TDQS
0*1
Rtt_Nom
D.I.C
A11
TDQS enable
0Disabled
1
Enabled
Rtt_Nom
BA1
BA0
MRS mode
00
MR0
01
MR1
10
MR2
11
MR3
AMS73CAG01808RA


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