參數(shù)資料
型號: PPC440EPx-NpAfffTs
廠商: Applied Micro Circuits Corp.
英文描述: PowerPC 440EPx Embedded Processor
中文描述: 嵌入式處理器的PowerPC 440EPx
文件頁數(shù): 88/94頁
文件大小: 738K
代理商: PPC440EPX-NPAFFFTS
440EPx – PPC440EPx Embedded Processor
Preliminary Data Sheet
88
AMCC Proprietary
Revision 1.26 – October 15, 2007
Figure 11. DDR SDRAM Write Cycle Timing
DQS
MemData
PLB Clk
MemClkOut
Addr/Cmd
T
SK
T
SA
T
HA
T
DS
T
DS
T
SD
T
HD
T
SD
T
HD
T
SA
= Setup time for address and command
T
HA
= Hold time for address and command signals from MemClkOut
T
SD
= Setup time for data signals (minimum time data is valid
before
rising/falling edge of DSQ)
T
HD
= Hold time for data signals (minimum time data is valid
after
rising/falling edge of DSQ)
T
SK
= Delay from falling edge of MemClkOut to rising/falling edge of signal (skew)
T
DS
= Delay from rising/falling edge of clock to the rising/falling edge of DQS
Note:
The timing data in the following tables is based on simulation runs using Einstimer.
Notes:
1. All of the DQS signals are referenced to MemClkOut with the DQS delay line programmed to 1 cycle.
2. Clock speed is 166 MHz.
Signal Name
T
DS
(ns)
Minimum
0.030
0.030
0.050
0.110
0.140
0.120
0.060
0.010
0.140
Maximum
+
0
.
650
+
0
.
620
+
0
.
580
+
0
.
480
+
0
.
410
+
0
.
480
+
0
.
580
+
0
.
690
+
0
.
420
DQS0
DQS1
DQS2
DQS3
DQS4
DQS5
DQS6
DQS7
DQS8
Table 24. I/O Timing—DDR SDRAM T
DS
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