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AMS73CAG02408RAUJH7I Datasheet(PDF) 8 Page - Advanced Monolithic Systems Ltd |
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AMS73CAG02408RAUJH7I Datasheet(HTML) 8 Page - Advanced Monolithic Systems Ltd |
8 / 31 page 8 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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