LSI Logic Confidential
AC Timing
18-25
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
18.2.4.5
DMN-8600 Read from SDRAM in DDR Mode
For DDR mode when reading from SDRAM, the SDRAM drives the
SDRAM_DQS signals together with the SDRAM_DQ pin. DQS pins are
generally edge-aligned with the data on SDRAM_DQ. The strobe is
delayed within DMN-8600 so that the edge can be used to sample data.
Figure 18.20 DMN-8600 Read from SDRAM in DDR Mode
Please note the following related information:
•
Control pins include SDRAM_CAS, SDRAM_RAS, SDRAM_WE, and
address pins include SDRAM_A[15:0], all of which are outputs of
DoMiNo.
T
2
T
1
SDRAM_CLK (O)
SDRAM_CLK (O)
SDRAM_DQS[3:0] (I/O)
Control/Addr Pins (O)
SDRAM_DQ[31:0] (I/O)
T
3
T
4
T
4
T
3
Table 18.15 DMN-8600 Read from SDRAM (DDR mode) Parameters
Symbol
Description
Min
Max
Unit
T
1
Control/Addr pins output delay
–
4.5
ns
T
2
Control/Addr pins hold time
1.0
–
ns
T
3
Data strobe edge to output data edge
–
0.6
ns
T
4
Input data valid time
0.3
–
T
CYC