參數(shù)資料
型號(hào): 440GR
廠商: Applied Micro Circuits Corp.
英文描述: Power PC 440GR Embedded Processor
中文描述: 440GR的Power PC嵌入式處理器
文件頁(yè)數(shù): 73/82頁(yè)
文件大小: 527K
代理商: 440GR
AMCC Proprietary
75
440GR – PPC440GR Embedded Processor
Preliminary Data Sheet
Revision 1.16 – July 19, 2006
Figure 10. DDR SDRAM Read Data Path
In the following examples, 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 eight DQS signals be matched.
Table 23. I/O Timing—DDR SDRAM TSIN and TDIN
Notes:
1. TSIN = Delay from DQS at package pin to C on Stage 1 FF.
2. TDIN = Delay from data at package pin to D on Stage 1 FF.
3. Clock speed for the values in the table is 133MHz.
4. The time values for TSIN include 1/4 of a cycle at 133MHz (7.5ns x 0.25 = 1.875 ns).
Signal Name
TSIN (ns)
minimum
TSIN (ns)
maximum
Signal Name
TDIN (ns)
minimum
TDIN (ns)
maximum
DQS0
2.74
3.70
MemData00:07
0.86
1.87
DQS1
2.75
3.69
MemData08:15
0.87
1.86
DQS2
2.74
3.69
MemData16:23
0.89
1.86
DQS3
2.76
3.69
MemData24:31
0.88
1.85
DQS8
2.77
3.68
ECC0:7
0.89
1.83
Stage 1
Stage 2
Stage 3
RDSP
PLB bus
FF,
FF
Data
Read Select
(SDRAM0_TR1)
DQS
1/4
Cycle
Delay
PLB Clock
Programmed
Delay
D
C
Package pins
Mux
Read Clock
C
D
FF Timing:
TIS = Input setup time = 0.2ns
TIH = Input hold time = 0.1ns
TP = Propagation delay (D to Q or C to Q) = 0.4ns maximum
XL
ECC
FF: Flip-Flop
XL: Transparent Latch
Q
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