參數(shù)資料
型號: 440SPE
廠商: Applied Micro Circuits Corp.
英文描述: PowerPC 440SPe Embedded Processor
中文描述: 嵌入式處理器的PowerPC 440SPe
文件頁數(shù): 71/80頁
文件大?。?/td> 572K
代理商: 440SPE
PowerPC 440SPe Embedded Processor
Revision 1.23 - Sept 21, 2006
AMCC Proprietary
73
Preliminary Data Sheet
DDR SDRAM Clock to Write DQS Timing—TDS
Note 1: All of the DQS signals are referenced to MemClkOut.
Note 2: Clock speed is 333 MHz.
Note 3: The TDS values in the table include 1.5
× 3ns cycle at 333 MHz (3 ns × 1.5 = 4.5 ns).
Note 4: To obtain adjusted values for lower clock frequencies, subtract 4 ns from the values in the following table
and add
× 1.5 of the cycle time for the lower clock frequency (T
DS - 4.5 + 1.5 TCYC).
DDR SDRAM Write Data to DQS Timing—TSD and THD
Note 1: TSD and THD are measured under worst-case conditions.
Note 2: Clock speed for the values in the following table is 333 MHz.
Table 18. DDR SDRAM Clock to Write DQS Timing—TDS
Signal Name
TDS (ns)
Minimum
Maximum
DQS0
4.76
5.07
DQS1
4.78
5.09
DQS2
4.78
5.10
DQS3
4.76
5.07
DQS4
4.79
5.11
DQS5
4.80
5.13
DQS6
4.81
5.11
DQS7
4.79
5.11
DQS8
4.77
5.07
Table 19. DDR SDRAM Write Data to DQS Timing—TSD and THD
Signal Name
Reference Signal
TSD (ns)
THD (ns)
MemData00:07, DM0
DQS0
0.58
0.64
MemData08:15, DM1
DQS1
0.62
0.55
MemData16:23, DM2
DQS2
0.62
0.60
MemData24:31, DM3
DQS3
0.63
0.57
MemData32:39, DM4
DQS4
0.68
0.54
MemData40:47, DM5
DQS5
0.67
0.52
MemData48:55, DM6
DQS6
0.62
0.61
MemData56:63, DM7
DQS7
0.65
0.55
ECC0:7, DM8
DQS8
0.63
0.61
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