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UPD48576209F1 Fiches technique(PDF) 31 Page - Renesas Technology Corp |
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UPD48576209F1 Fiches technique(HTML) 31 Page - Renesas Technology Corp |
31 / 54 page µµµµPD48576209F1, µµµµPD48576218F1, µµµµPD48576236F1 R10DS0256EJ0101 Rev. 1.01 Page 31 of 53 Jan. 15, 2016 2.13 On-Die Termination On-die termination (ODT) is enabled by setting A9 to “1” during an MRS command. With ODT on, all the DQs and DM are terminated to VTT with a resistance RTT. The command, address, and clock signals are not terminated. Figure 2- 20 below shows the equivalent circuit of a DQ receiver with ODT. ODTs are dynamically switched off during READ commands and are designed to be off prior to the µPD48576209/18/36F1 driving the bus. Similarly, ODTs are designed to switch on after the µPD48576209/18/36F1 has issued the last piece of data. Table 2-5. On-Die Termination DC Parameters Description Symbol MIN. MAX. Units Note Termination voltage VTT 0.95 x VREF 1.05 x VREF V 1, 2 On-Die termination RTT 125 185 Ω 3 Notes 1. All voltages referenced to VSS (GND). 2. VTT is expected to be set equal to VREF and must track variations in the DC level of VREF. 3. The RTT value is measured at 95°C TC. Figure 2-20. On- Die Termination-Equivalent Circuit Figure 2-21. READ Burst with ODT: BL=2, Configuration 1 Remark RD : READ command A/BAp : Address A of bank p RL : READ latency Qpq : Data q from bank p VTT RTT sw Receiver DQ CK# CK COMMAND 0 1 2 3 4 5 6 7 8 ADDRESS RL = 4 DQ QKx QKx# Q0a Q1a Q0b Q1b Q2a Q2b RD A BA0 A BA1 A BA2 RD RD NOP NOP NOP NOP NOP NOP Don't care Undefined ODT ODT ON QVLD ODT OFF ODT ON |
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