EtronTech
1M x 16 SDRAM EM636165-XXI
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
tCH
tCL
tCK2
CKE
tIS
Begin AutoPrecharge
Begin AutoPrecharge
Bank A
Bank B
tIS
tIH
tIS
CS#
RAS#
CAS#
WE#
A11
A10
A0-A9
tIH
RAx
tIS
RBx
CAx
RBx
RBx
CBx
RAy
RAy
CAy
RAz
RBy
RAz
RBy
DQ M
Hi-Z
DQ
tRCD
tRC
tDAL
tIS
tIH
tWR tRP
Ax0 Ax1 Ax2 Ax3 Bx0 Bx1 Bx2 Bx3 Ay0 Ay1 Ay2 Ay3
tRRD
Activate Writewith Activate Writewith Activate
Command AutoPrecharge Command AutoPrecharge Command
Bank A Command Bank B Command Bank A
Bank A
Bank B
W rite
Command
Bank A
Precharge Activate
Command Command
Bank A Bank A
Activate
Command
Bank B
Preliminary
21
Rev. 1.1 Apr. 2005