EtronTech
EM638325
2Mega x 32 SDRAM
Timing Waveforms
Figure 1. AC Parameters for Write Timing (Burst Length=4, CAS# Latency=2)
T0 T 1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T 11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
tCL
tCK2
tCH
tIS
tIH
Begin AutoPrecharge
Bank A
Begin AutoPrecharge
Bank B
CKE
CS#
tIS
tIS
RAS#
CAS#
WE#
BS0,1
tIH
CAx
tIS
ADDR.
DQM
RBx
CBx
RAy
RAz
RBx
CAy
RBy
tDAL
tRCD
tIS
tRC
Ax0 Ax1 Ax2
tWR
tRP
tRRD
tIH
Hi-Z
DQ
Ax3 Bx0 Bx1 Bx2 Bx3 Ay0 Ay1 Ay2 Ay3
Activate
Write with
Activate Write with
Activate
Write
Command
Bank A
Precharge Activate
Command Command
Activate
Command
Bank B
Command AutoPrecharge CommandAutoPrecharge Command
Bank A
Command
Bank A
Bank B
Command
Bank B
Bank A
Bank A
Bank A
Preliminary
20
Rev 1.4
Oct. 2005
ETRON [ ETRON TECHNOLOGY, INC. ]
