參數(shù)資料
型號: PPC405EX-SpAfffTx
廠商: Applied Micro Circuits Corp.
英文描述: PowerPC 405EX Embedded Processor
中文描述: 嵌入式處理器的PowerPC 405EX
文件頁數(shù): 63/67頁
文件大小: 457K
代理商: PPC405EX-SPAFFFTX
PPC405EX – PowerPC 405EX Embedded Processor
Revision 1.09 - August 21, 2007
AMCC Proprietary
63
Preliminary Data Sheet
In the following example, the data strobes (DQS) and the data are shown 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 DQS signals be matched.
The following example shows the timing relationship between SDRAM DDR Data at the input pin and storing the
data in Stage 1.
Table 24. I/O Timing—DDR SDRAM Read Timing T
SD
and T
HD
1. T
SD
and T
HD
are measured under worst case conditions.
2. Clock speed for the values in the table is 200MHz.
3. The time values in the table include 1/4 of a cycle at 200MHz (5ns x 0.25 = 1.25 ns).
4. To obtain adjusted T
SD
and T
HD
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., T
SD
- 1.25 + 0.25T
CYC
).
Signal Names
Reference Signal
Read Data vs DQS Set up
T
SD
(ns)
0.35
0.35
0.35
0.35
0.35
Read Data vs DQS Hold
T
HD
(ns)
0.45
0.45
0.45
0.45
0.45
MemData00:07
MemData08:15
MemData16:23
MemData24:31
ECC0:7
DQS0
DQS1
DQS2
DQS3
DQS4
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