Project Schematic Setup

Worked for 2 mins 25 sec

Да — нанесох DDR сигналните връзки между U2 и U3 като отделни нетове: адреси, BA, DQ0–DQ15, DQS, DM, CK, CKE, CS, RAS/CAS/WE, ODT и RESET.

Не пипнах захранванията и капацитетите, както каза по-рано. Остават за следваща стъпка: VDD/VDDQ, VREFCA/VREFDQ, GND/VSS/VSSQ и ZQ 240 Ω към GND.

plamenivanovgenchev1967

по някаква причина u4 не е свързана никъде. можеш ли да я свържеш и нея?

Thought for 5 sec

flux

Ще свържа U4 като втори x16 DDR3 чип към U2: адресните/контролните линии ще са общи с U3, а данните ще отидат към горната половина DQ16–DQ31 на U2. Първо ще проверя текущите пинове/нетове, после ще нанеса връзките и ще валидирам.

Worked for 2 mins 24 sec

flux

Готово — свързах U4 към U2 като втория DDR3 x16 чип.

Направено:

U4 адрес/BA/команди/clock/reset са вързани към същите DDR нетове като U3.
U4 данните са вързани към U2 DQ16–DQ31.
U4 DQS/DM са вързани към DQS2/3 и DM2/3.
NC пиновете на U4 са маркирани като No Connect.

Остават несвързани захранванията/референциите на U4: VDD, VDDQ, VSS/VSSQ, VREFCA, VREFDQ и ZQ — тях можем да направим в следващата стъпка.

Свържи U4 захранване

Добави decoupling

Пусни ERC проверка

Провери DDR референции

Reviews

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