LSI Logic Confidential
18-22
Specifications
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
18.2.4.2
DMN-8600 Writing to SDRAM in SDR Mode
SDRAM writes are in burst mode. A burst length of 8 is programmed
during initialization. The Burst Stop command is issued to terminate
writes when needed. Valid data is driven in the cycle when a write
command is issued.
Figure 18.17 DMN-8600 Writing to SDRAM in SDR Mode
Please note the following information:
•
Control pins include SDRAM_CAS, SDRAM_RAS, SDRAM_WE, and
address pins include SDRAM_A[15:0], all of which output of the
DMN-8600.
•
SDRAM_DQ[31:0] is driven from DMN-8600 for writes to SDRAM.
18.2.4.3
DMN-8600 Reading from SDRAM in SDR Mode
SDRAM reading, like writing, is also in burst mode. CAS latency for a
DRAM read is programmed once during initialization of the memory chip.
For SDR mode, it can be 2 or 3.
T
2
T
1
SDRAM_CLK (O)
Control/Addr Pins (O)
SDRAM_DQ[31:0] (I/O)
T
3
T
4
Table 18.12 DMN-8600 Write to SDRAM Parameters
Symbol
Description
Min
Max
Units
T
1
Control/Addr pins output delay
4.5
ns
T
2
Control/Addr pins hold time
1.0
T
3
Output Data delay
4.5
ns
T
4
Output Data hold time
1.0
ns
Содержание DMN-8600
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