Xerox WorkCentre Pro 412 Service Manual page 74

Circuit Description
5-3-6-4 SDRAM write timing (WorkCentre M15/M15i)
0 1 2
CLOCK
CKE
*Note 1
CS
RAS
CAS
RAa RBb
ADDR
BA
0
BA
1
A /AP RAa RBb
10
CL=2
DQ
CL=3
WE
DQM
Row Active
(A-Bank)
Row Active
(B-Bank)
*Note : 1. To interrupt burst write by Row precharge, DQM should be asserted to mask invalid input data.
2. To interrupt burst wrige by Row precharge, both the write and the prechargebanks must be the
same.
5-36
3 4 5 6 7 8
CAa RCc CBb
RCc
QAa0 QAa1 QAa2
QAa0 QAa1
Read Read
(A-Bank) (B-Bank)
Row Acive
(C-Bank)
Precharge
(A-Bank)
9 10 11 12 13
HIGH
RDd CCc CDd
RDd
QBb0 QBb1 QBb2 QCc0 QCc1 QCc2
QAa2 QBb0 QBb1 QBb2 QCc0 QCc1
Read Read
(C-Bank) (D-Bank)
Precharge
(D-Bank) (C-Bank)
Precharge
(B-Bank)
3/03 WorkCentre Pro 412, FaxCentre F12 &
14 15 16 17 18 19
*Note 2
QDd0 QDd1 QDd2
QCc2 QDd0 QDd1 QDd2
Precharge
(D-Bank)
: Don't care
WorkCentre M15/M15i