参数资料
型号: 405EX
厂商: Applied Micro Circuits Corp.
英文描述: PowerPC 405EX Embedded Processor
中文描述: 嵌入式处理器的PowerPC 405EX
文件页数: 57/67页
文件大小: 457K
代理商: 405EX
PPC405EX – PowerPC 405EX Embedded Processor
60
AMCC Proprietary
Revision 1.09 - August 21, 2007
Preliminary Data Sheet
The following diagram illustrates the relationship among the signals involved with a DDR write operation.
Figure 7. DDR SDRAM Write Cycle Timing
Note: The timing data in the following tables is based on simulation runs using Einstimer.
Table 21. I/O Timing—DDR SDRAM TDS
Notes:
1. All of the DQS signals are referenced to MemClkOut with the DQS delay line programmed to 1 cycle.
2. Clock speed is 200MHz.
Signal Name
TDS (ns)
Minimum
Maximum
DQS0
4
6
DQS1
4
6
DQS2
4
6
DQS3
4
6
DQS4
4
6
DQS
MemData
PLB Clk
MemClkOut
Addr/Cmd
TSK
TSA
THA
TDS
TSD
THD
TSD
THD
TSA = Setup time for address and command signals to MemClkOut
TSK = Delay from rising edge of MemClkOut to rising/falling edge of signal (skew)
THA = Hold time for address and command signals from MemClkOut
TDS = Delay from rising/falling edge of clock to the rising/falling edge of DQS
TSD = Setup time for data signals (minimum time data is valid before rising/falling edge of DSQ)
THD = Hold time for data signals (minimum time data is valid after rising/falling edge of DSQ)
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