參數(shù)資料
型號: 440SP
廠商: Applied Micro Circuits Corp.
英文描述: PowerPC 440SP Embedded Processor
中文描述: 嵌入式處理器的PowerPC 440SP
文件頁數(shù): 80/85頁
文件大?。?/td> 615K
代理商: 440SP
PowerPC 440SP Embedded Processor
Revision 1.23 - Sept 26, 2006
AMCC Proprietary
81
Data Sheet
Figure 10 shows the data strobe (DQS) and the data to be coincident. There is actually a slight skew as specified
by the SDRAM specifications, and there can be additional skew due to loading and signal routing. It is
recommended that the signal length for all of the eight DQS signals be matched.
Figure 10. DDR SDRAM Memory Data and DQS
Table 20. DDR SDRAM I/O Read Timing—TSD and THD
Notes:
1. TSD and THD are measured under worst case conditions.
2. Clock speed for the values in the table is 333.33MHz.
3. The time values in the table include 1/4 of a cycle at 166MHz (3ns x 0.25 = 0.75 ns).
4. To obtain adjusted TSD and THD values for lower clock frequencies, subtract 0.75 ns from the values in the table and add 1/4
of the cycle time for the lower clock frequency (e.g., TSD - 0.75 + 0.25TCYC).
Signal Names
Reference Signal
Read Data vs DQS Setup
TSD (ns)
Read Data vs DQS Hold
THD (ns)
MemData00:07
DQS0
0.00
1.00
MemData08:15
DQS1
0.00
1.00
MemData16:23
DQS2
0.00
1.00
MemData24:31
DQS3
0.00
1.00
MemData32:39
DQS4
0.00
1.00
MemData40:47
DQS5
0.00
1.00
MemData48:55
DQS6
0.00
1.00
MemData56:63
DQS7
0.00
1.00
ECC0:7
DQS8
0.00
1.00
DQS
MemData
TSD
THD
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