ABB3BHB005922R0001UNS0880a-p,v1ABB3BHB005922R0001UNS0880a-p,v1ABB3BHB005922R0001UNS0880a-p,v1===============================================================前言近年来随着视频设备、个人电脑的发展，在这些设备上进行的3D处理，视频交换以及复杂的运算导致数据量急剧增大，为了满足这些数据要在处理器、Memory和外围设备之间的高速交换，近年来出现了多种多样的高速接口。同时，由于数据的高速传输，也给测试带来的新技术上及测试成本上的挑战。本文将基于Advantest的T6500系列测试系统，针对最近出现的高速数据传输接口DDR2I/F的特性及测试进行简单介绍。高速MemoryI/F概要为了简单说明，表1列出了从1990年至今PCmemory总线，微处理器，memory单元以及高速接口的对应情况。从表中可以看出传输总线的速度随着从SDR到DDR2的转变而迅速提高。随着数据量的日益增大，DDR2存储器已成为内存和图形处理芯片的主流应用。因此，SoC芯片中的DDR2I/F应用也越来越广泛。MemoryI/F发展历史DDR2在Memorycell和I/Obuffer间集成了4bit的pre-fetches传输线，相同频率的DDR1只集成了2bit，因此DDR2的数据频率可以达到DDR1的2倍（如图2）。DDRDDR2I/F高速信号传输原理DDR2I/F的管脚示例如图3，决定DDR2I/FI/O特点的管脚是DQS(datastrobesignal)和DQ(data)。CLK用来提供外部时钟信号，Command用来提供控制指令，DM用来屏蔽某些数据位的输出。DDR2I/F的管脚与传统的数据传输方式不同，DDR2数据(data)的输入输出并不是与外部时钟信号同步，而是由差分的DQS(datastrobesignal)信号进行控制。如图4所示，DQ的数据输出是有DQS的上升沿和下降沿触发的。通过这种方式，可以实现DDR2芯片数据的高速传输。DDR2I/F测试要求DDR2I/F的数据传输频率很高，并且对传输信号的品质要求也比较高，爱德万测试提供了以T6577+DDR2I/Foptionmodule的方式满足了DD2I/F的各种性能测试及低成本的测试要求。下面以DDR667（数据频率667Mbps）为例，简单介绍对其进行测试时相应的信号管脚上需要的测试条件以及与其对应的测试方法：DQS/DQn测试条件：信号频率:667Mbps接口规格:SSTL18Clock测试条件：信号频率：333Mbps接口规格：SSTL18DQS与DQn之间的关系：通过DQS信号控制DQn管脚上数据连续的输入和输出。AC参数测试条件：通过optionmodule提供高频时间参数的测试条件。DC参数测试条件：通过T6577内置的MDC,UDC测量单元对DDR2I/F的DC参数进行高精度测试。T6577+DDR2I/Foptionmodule原理图ABBDAI0493BSE013280R1TU810V16DPW015DI6205DDI014DDO024DAI053DI6103DO6103DRA023DSAX4523DSDP1703PU5153IMASI23337911-4-03381252AO6102DSBC1762DSDX4522DSPC172H2DSQC3222DSQC3522IEMU112NTCL012PM6302PU515A2TC501V1503BSC550038R32TC514V22PM511V161AI625207KT97B135AE92137911-4-033812413BSE008538R113BSE013062R1PU51413BSE013231R1TU811V113BSE032400R1PU514A13HAC0373-113HNE00313-1（含10米线及插头）172395-4-03391231AI6101CI6251CI810B1CM10/2001DAI011DAI031DAO011DCP021DCP101DDI031DDO011DI8141DLM011DO6201DO8201DSAI1301DSAI130D1DSAI1451DSAO1101DSAX4521DSDX4521DSIH72VPENOK1DSPC1701*****************************************************************DSPC1721DSQC327A1DSQC327A1DSQC3541DSQC503A1DSQC503A1DSQC5391DSQC6021DSQC6031DSQC6081DSQC6581DSTD1081DSU14I37911-4-03456591EHDB280-21-111PM510V161PM6321PM645B1RDCO-01C1RVC6-5A1SNAT7261PCP1TC512V11IMASO111IMDSO141DSQC5401CI626V11PM6331SC6101SC5201SC5131SB5101SR5111TC5201SC5101CI545V011BB510(DC5256)1RF61513HNE00313-11FOXBORO电源53FBM0438FBM20237P0400DL30P0500RG31FBM0230P0904FH27P0916AC27P0500RY24FBM20123FCM10E22FBM20420P0916AG20FBM0318FBM20317FBM0116FBM23716P0914XA16FBM24215FBM0713FBM21712P0961FR-CP6011P0961BC-CP40B11AD196BC10FBM214c10FPS400-2410P0916AA11P0800DC9P0950CA9P0960AW-CP309FBM098FBM128FBM428P0903ZE8FBM417P0916JW7P0971WV-DNBT7P0400VE6FCM100Et6P0916AE6FBM025P0500SR5P0914ZM5P0972PP-NCNI5P0961BD-GW30B5P0960HA5130K-N4-LLPF4FBM054FBM2074P0700WB4P0916FJ4FCP2704P0961EF-CP30B4P0916JP3P0500RU3P0970BC-DNBT3P0400ZG3P0926CP-ZCP2703P0970VB3P0903CW2FBM2062FBM207B2FBM2112FCM10Ef2P0800DA2P0902YU2P0903NQ2P0903NW2P0903ZN2P0916NG1P0917MF2P0960JA-CP403P0961CA2P0970EJ-DNBX2P0400VP-CMP102FBI10E2FBM061FBM071FBM181FBM2141FBM2231FBM2241K0143AA-PK0143AC-A1P0400VT1P0901VK1P0903MU1P0904BS1P0911VJ1P0912CA1P0916AW1P0916FK1P0926GH1P0970BC-DNBI1PO911SM1SRP981-BIDLS1NA1P0400HE1P0961FX-CP60S1P0916JS1FBM441TRICON3604E1137005300353501E53502E53601E53636R53503E4410143607E33805E42658230062411923607E23700A241182450024211120581255113008135111362513721135111370113703E13708E13805H1410714119A142011432814400145071460917400166-3903000520-3901A-B1756-N2341756L55M14161756-CNB141771-OBN121756-DNB111203-CN191747-L54191785-L40B91746-IB1621756-IF1671756L55M1361785-L30B61746-OB1661756-OB16I61747-L51451756L55M1251747-ASB51746-IB3241747-L52441771-IVN45370-CVIM41756-ENBT61756-OF831746-OB16E31746-A1031746-HSRV31756L55M2431756M1331756-M1431771-OZ31784-KTX31785-L60B31757-SRM31746-P231771-OAD31756-A1731771-IFE31756-CNBR41756-OB3231756-OW16I21747-L53221746-NO4V21746-NIO4V21746-OB3221747-L55121756L55M2321756-L6221756-PA7521771-ASB21771-IBN21771-NC621772-LG21785-LT22711-T5A1L122801-N222700DC-PL500Z22700-PK400A121756-L6321756-IB16I21756-PA7221746-OX821756-IF6I21756-IF821747-L55321769-L32E11785-L80E11201-HASI11336-B025-AA-EN-GM111336-BDB-SP39011336-BDB-SP39D11336F-B030-AN-EN11336F-BRF30-AA-EN11336-MOD-L211336-PB-SP2B11394-AM0311394-AM0411394-SJT05-C-RL11394-SJT10-C-RL11398-DDM-03011492-IFM40D2411734-232ASC11746-A711746-NT811746-P111747-FC11747-L51111747-L54311747-L55211747-SDN11756-A1011756-A411756-BATM11756-CN211756-DHRIO11756-ENET11756-L5511756L55M1611756L55M2211756-M08SE11756-M1211756-PA7511756-PB75R11762-L24BWA11764-24BWA11769ADN11769-ECR11769-L35E11769-PA211769-SDN11770-FF11771-IR11771-IXHR11771-NIS11771-OFE211771-OVN11771-OZL11783-EMS08T11784-KTXD11784-PCMK11785-L20B11785-L30A11785-L60L11785-L80B11785-V80B11790-DT16BVO11790-T0B16X11790-T0W8X11790-T16BV0X11791-8BC11794-AND11794-TB3G120-VB0060112711E-T14C612711E-T14C6X12711-NM1512711-T10C1012801-NC1712801-NC18A12801-YC1500L-DOD9316186-M15ALTR1700-HN1001CP16N1101MP-B540D-MJ24-AA1SST-PFB-SLC11756-A711746-NR811746-OA1611756-PB7511768-ENBT11769-IQ161)