EtronTech
EM68916CWQA
Figure 18.1. Posted CAS# operation: AL=2
Read followed by a write to the same bank
-1
0
1
2
3
4
5
6
7
8
9
10
11
12
CK#
CK
Active
A-Bank
Read
A-Bank
Write
A-Bank
CMD
WL=RL-1=4
AL=2
CL=3
DQS
DQS#
>=tRCD
RL=AL+CL=5
Dout 0 Dout 1 Dout 2 Dout 3
Din 1
Din 0
Din 2 Din 3
DQ
[ AL=2 and CL=3, RL= (AL+CL)=5, WL= (RL-1)=4, BL=4]
Figure 18.2. Posted CAS# operation: AL=0
Read followed by a write to the same bank
-1
0
1
2
3
4
5
6
7
8
9
10
11
12
CK#
CK
AL=0
Active
A-Bank
Read
A-Bank
Write
A-Bank
CMD
WL=RL-1=2
CL=3
DQS
DQS#
>=tRCD
RL=AL+CL=3
Dout 0 Dout 1 Dout 2 Dout 3
Din 0 Din 1 Din 2 Din 3
DQ
[ AL=0 and CL=3, RL= (AL+CL)=3, WL= (RL-1)=2, BL=4]
Etron Confidential
39
Rev. 1.1
Apr. 2009
ETRON [ ETRON TECHNOLOGY, INC. ]
