John Wiley & Sons. We can provide DDR PHY Interface(DFI) in SystemVerilog, Vera, SystemC, Verilog E (Specman) and we can add any new feature to DDR PHY Interface(DFI) as per your request in notime. For phased operation, dedicated buses allow the establishment of timing relationship other than 2x or 4x PHY clocks. ISBN 978-0-7645-7481-8.
Since Tphy_wrlat is not divisible by 2 , parameter S (equals 1) has certain effect on the encoding of the dfi_wrdata_en_pN . _pN to _p[N+(R2-T)+S*T] asserted @T_data DFi clock cycles from assertion of the first enable. Her expertise area includes ASIC , SOC verification amd post silicon validation. 5 shows a 1:2 Frequency ratio Single Write command with data word of burst length 16 .. . a) If command is being driven on Phase 0, then N = 0 and N+1 = 1 and ((N+1) +1) = 0 and so on. Fig.4 1:2 Frequency Ratio Single Read with even Tphy_wrlat and even Tphy_wrdata, Fig.5 1:2 Frequency Ratio Single Read with even Tphy_wrlat and odd Tphy_wrdata, Fig.6 1:2 Frequency Ratio Single Read with odd Tphy_wrlat and even Tphy_wrdata, Fig.7 1:2 Frequency Ratio Single Read with odd Tphy_wrlat and odd Tphy_wrdata. . Powered by, Badges  |  This algorithm can be used to model the DDR-MC in RTL.

The DDR PHY Interface (DFI) is an interface protocol that defines the signals, timing parameters, and programmable parameters required to transfer control information and data over the DFI, to and from the DRAM devices, and between the MC and the PHY.
66 Figure 56 WRDATA ON DFI & DRAM - DFI 256 BITS (4 X 64) TRANSLATE TO 32 BIT BL8 ON DRAM . In order to communicate this information to the PHY, the phase information must be encoded within the signal. Note: Only mails from offical mail ID will be processed. All material on this site Copyright © 2017 Design And Reuse S.A. All rights reserved. --> No restrictions on MC or PHY - The DFI protocol does not encompass all of the features of the MC or the PHY, nor does the protocol put any restrictions on how the MC or the PHY interface to other aspects of the system. DFI permits companies to develop both MC and PHY IP designs knowing that they will be able to interoperate with the devices developed by other companies. Easy to use command interface simplifies monitor control and configuration. Although there is no discussion regarding a frequency ratio greater that 1:4. --> Data Bus Inversion - DBI can be used for reducing the number of transitions on the bus and/or reducing the noise and power consumption on the bus. From equations “(1)” and “(2)” , S indicates the divisiblity of Tphy_wrlat by 2 and 4 in a 1:2 and 1:4 frequency ratio system respectively. Privacy Policy  |  DFi™ is a standard that ensures the compatibility of DDR MC and DDR PHY at target matched frequencies and frequency ratios.

_pN asserted @T_en DFi clock cycles after command. The subsequent data words (D2, D3, D4, D5, D6, and D7) are placed incrementally in the subsequent phases in the following clock edges. The design of a Memory Controller (MC) and its integration to a system has long posed difficult challenges to engineers and system architects. Runs in every major simulation environment. E. Read Data Interface in Frequency Ratio Systems[2]. Remaining _pN asserted @Q1 DFi clock cycles after command. etc.) DFI signals may be sent or received on the DFI PHY clock, provided the signals reference the rising edge of the DFI clock and the clock is phase aligned. Table 3: Timing relationship for enable signals. Write and Read Data Interface in Frequency Ratio Systems. The MC asserts the dfi_wrdata_en_p1 at Q1 DFI clock and dfi_wrdata_en_p0 at (Q1+S) DFI clocks following the WRITE command . SmartDV's DFI Verification env contains following. However, DDR MC Phase encoding algorithm for a frequency ratio system is not in the specification.


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