array(3) { ["data"] => array(20) { [0] => array(11) { ["tagname"] => string(10) "主板ddr2" ["inlink"] => int(0) ["addtime"] => string(10) "1598922953" ["tagid"] => int(819087) ["id"] => string(6) "819087" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503937976401956) ["pageurl"] => string(35) "//www.sheji456.com/ask/tlist/819087" ["m_pageurl"] => string(33) "//m.sheji456.com/ask/tlist/819087" } [1] => array(11) { ["tagname"] => string(17) "volte怎么设置" ["inlink"] => int(0) ["addtime"] => string(10) "1599444624" ["tagid"] => int(1152738) ["id"] => string(7) "1152738" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503949469843461) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/1152738" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/1152738" } [2] => array(11) { ["tagname"] => string(17) "dlink怎么设置" ["inlink"] => int(0) ["addtime"] => string(10) "1598841888" ["tagid"] => int(773939) ["id"] => string(6) "773939" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503936608010243) ["pageurl"] => string(35) "//www.sheji456.com/ask/tlist/773939" ["m_pageurl"] => string(33) "//m.sheji456.com/ask/tlist/773939" } [3] => array(11) { ["tagname"] => string(15) "dns怎么设置" ["inlink"] => int(0) ["addtime"] => string(10) "1598923166" ["tagid"] => int(833666) ["id"] => string(6) "833666" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503938396880929) ["pageurl"] => string(35) "//www.sheji456.com/ask/tlist/833666" ["m_pageurl"] => string(33) "//m.sheji456.com/ask/tlist/833666" } [4] => array(11) { ["tagname"] => string(21) "层叠温暖简约风" ["inlink"] => int(0) ["addtime"] => string(10) "1600481990" ["tagid"] => int(1698605) ["id"] => string(7) "1698605" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503969587822595) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/1698605" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/1698605" } [5] => array(11) { ["tagname"] => string(24) "多层叠级吊顶龙骨" ["inlink"] => int(0) ["addtime"] => string(10) "1594017247" ["tagid"] => int(331463) ["id"] => string(6) "331463" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503921344937999) ["pageurl"] => string(35) "//www.sheji456.com/ask/tlist/331463" ["m_pageurl"] => string(33) "//m.sheji456.com/ask/tlist/331463" } [6] => array(11) { ["tagname"] => string(21) "层叠的设计装饰" ["inlink"] => int(0) ["addtime"] => string(10) "1604656797" ["tagid"] => int(4736764) ["id"] => string(7) "4736764" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703504071909965824) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/4736764" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/4736764" } [7] => array(11) { ["tagname"] => string(18) "水电怎么走线" ["inlink"] => int(0) ["addtime"] => string(10) "1599534045" ["tagid"] => int(1202957) ["id"] => string(7) "1202957" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503951090941980) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/1202957" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/1202957" } [8] => array(11) { ["tagname"] => string(24) "卧室空调怎么设置" ["inlink"] => int(0) ["addtime"] => string(10) "1599183256" ["tagid"] => int(1107720) ["id"] => string(7) "1107720" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503948135006236) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/1107720" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/1107720" } [9] => array(11) { ["tagname"] => string(24) "小爱音箱怎么设置" ["inlink"] => int(0) ["addtime"] => string(10) "1599444624" ["tagid"] => int(1162702) ["id"] => string(7) "1162702" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503949776027671) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/1162702" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/1162702" } [10] => array(11) { ["tagname"] => string(22) "auto空调怎么设置" ["inlink"] => int(0) ["addtime"] => string(10) "1599444624" ["tagid"] => int(1165669) ["id"] => string(7) "1165669" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503949869350927) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/1165669" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/1165669" } [11] => array(11) { ["tagname"] => string(24) "露台排水怎么设置" ["inlink"] => int(0) ["addtime"] => string(10) "1599530139" ["tagid"] => int(1175363) ["id"] => string(7) "1175363" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503950190215177) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/1175363" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/1175363" } [12] => array(11) { ["tagname"] => string(24) "指纹解锁怎么设置" ["inlink"] => int(0) ["addtime"] => string(10) "1598841888" ["tagid"] => int(777514) ["id"] => string(6) "777514" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503936707624991) ["pageurl"] => string(35) "//www.sheji456.com/ask/tlist/777514" ["m_pageurl"] => string(33) "//m.sheji456.com/ask/tlist/777514" } [13] => array(11) { ["tagname"] => string(24) "冰箱温度怎么设置" ["inlink"] => int(0) ["addtime"] => string(10) "1594372336" ["tagid"] => int(597189) ["id"] => string(6) "597189" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503930491666436) ["pageurl"] => string(35) "//www.sheji456.com/ask/tlist/597189" ["m_pageurl"] => string(33) "//m.sheji456.com/ask/tlist/597189" } [14] => array(11) { ["tagname"] => string(24) "冰箱怎么设置温度" ["inlink"] => int(0) ["addtime"] => string(10) "1594372438" ["tagid"] => int(611238) ["id"] => string(6) "611238" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503930926825490) ["pageurl"] => string(35) "//www.sheji456.com/ask/tlist/611238" ["m_pageurl"] => string(33) "//m.sheji456.com/ask/tlist/611238" } [15] => array(11) { ["tagname"] => string(24) "怎么设置冰箱温度" ["inlink"] => int(0) ["addtime"] => string(10) "1594372438" ["tagid"] => int(611364) ["id"] => string(6) "611364" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503930929971229) ["pageurl"] => string(35) "//www.sheji456.com/ask/tlist/611364" ["m_pageurl"] => string(33) "//m.sheji456.com/ask/tlist/611364" } [16] => array(11) { ["tagname"] => string(24) "阳台怎么设置好看" ["inlink"] => int(0) ["addtime"] => string(10) "1599183042" ["tagid"] => int(1079990) ["id"] => string(7) "1079990" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503946338795547) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/1079990" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/1079990" } [17] => array(11) { ["tagname"] => string(18) "怎么设置客厅" ["inlink"] => int(0) ["addtime"] => string(10) "1599183042" ["tagid"] => int(1086250) ["id"] => string(7) "1086250" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703503946513907747) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/1086250" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/1086250" } [18] => array(11) { ["tagname"] => string(21) "顶层叠墅的装修" ["inlink"] => int(0) ["addtime"] => string(10) "1606987478" ["tagid"] => int(6481679) ["id"] => string(7) "6481679" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703504131096838180) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/6481679" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/6481679" } [19] => array(11) { ["tagname"] => string(24) "双层叠墅装修案例" ["inlink"] => int(0) ["addtime"] => string(10) "1604110643" ["tagid"] => int(4045770) ["id"] => string(7) "4045770" ["depart"] => string(1) "0" ["updatetime"] => int(0) ["status"] => int(99) ["_version_"] => int(1703504049628774410) ["pageurl"] => string(36) "//www.sheji456.com/ask/tlist/4045770" ["m_pageurl"] => string(34) "//m.sheji456.com/ask/tlist/4045770" } } ["counts"] => int(602972) ["pagecount"] => float(30149) }

当前位置：首页>

装修问答

其他

ddr2走线层叠设置怎么作

ddr2走线层叠设置怎么作

浏览：39次 | 提问时间： 07-30 09:50

分享到：

3个答案

ジ作茧自縛づ 07-30 09:51

港湾少女 07-30 09:59

同组同层，控制等长。DDR SDRAM，DDR2使用T型走线。时钟与DQS之间控控等长。DDR3建议使用fly-by的方式。时钟与DQS无直接关系。你看看这个帖子： http://www.allegro-skill.com/thread-156-1-1.html

青丝绕 07-30 10:07

DDR2走线规则叠层设置： 1、对于同一组*线及其对应的DQ STROBE线，如DQ[7：0]、DM0与DQS0、DQS0#，应布在同一层，以减小信号skew。 2、 DDR2信号线的参考平面最好是选择地平面（尤其是时钟线），如果基于成本考虑，不得不选用电源层作为参考面，则DDR2供电电源平面需包围整个DDR2走线范围，且边缘要留有余量，电源与地平面间的阻抗在整个带宽范围内要足够低。线长匹配： 1、走线增加一个过孔，大概相当于增加了90mil的传输线长度。 2、对于走线长度应把封装内部引线长度计算在内。 3、各信号线的长度匹配如下表：（控制线：CS、CKE、ODT；命令线：Address、Bank Address、RAS、CAS、WE；*线：DQ、DM）信号类别最小长度最大长度控制线时钟线长度-500mil 时钟线长度-0 命令线时钟线长度-500mil 时钟线长度+500mil *STROBE线时钟线长度-250mil 时钟线长度+250mil *线-*STROBE线（同一*组） STROBE长度-220mil STROBE长度-180mil 4、时钟信号差分对的长度差应控制在5mil以内。 5、在能够满足布线空间的情况下，走线长度越短越好，一般控制在5000mil以内，可以以时钟线作为参考线。串扰： 1、对于蛇行走线，各线段之间的间距应至少为走线宽度的两倍（边沿到边沿）。 2、 DDR2信号线与非DDR2信号线之间的间距应大于25mil。 3、时钟、DQS等差分线与其它DDR2信号线的间距应大于20mil。 4、同一组命令线，同一组控制线或同一组*线间的走线间距应大于走线宽度1.5倍（最好2倍以上），而不同组间的信号线间距应大于走线宽度的2倍（最好3倍以上）。 5、在扇出线区域，由于空间限制，不能满足走线宽度和间距要求时，可适当减小走线宽度及减小走线间距，但该扇出线长度应小于500mil。 6、扇出线过孔应尽量靠近焊盘，如有可能，最好打焊盘孔。 7、每条信号线的过孔数最好不要超过两个。 8、 VREF参考电压线要有足够低的阻抗，且与其它DDR2信号线的间距大于25mil。阻抗匹配： 1、 DDR2 800信号走线单端阻抗应设置成50Ω 2、对于控制命令线、时钟线要进行阻抗匹配，可采用源端串联匹配或末端并联匹配。（源端匹配具有较小

装修问答

其他

ddr2走线层叠设置怎么作

最新问题

相关搜索

最新推荐

ddr2走线层叠设置怎么作