參數(shù)資料
型號: PPC440GRx-NpAfffTs
廠商: Applied Micro Circuits Corp.
英文描述: PowerPC 440GRx Embedded Processor
中文描述: 嵌入式處理器的PowerPC 440GRx
文件頁數(shù): 84/88頁
文件大小: 603K
代理商: PPC440GRX-NPAFFFTS
440GRx – PPC440GRx Embedded Processor
Preliminary Data Sheet
84
AMCC Proprietary
Revision 1.08 – October 15, 2007
Table 25. I/O Timing—DDR SDRAM T
DS
Notes:
1. All of the DQS signals are referenced to MemClkOut with the DQS delay line programmed to 1 cycle.
2. Clock speed is 166MHz.
Table 26. I/O Timing—DDR SDRAM T
SK
, T
SA
, and T
HA
Notes:
1. Clock speed is 166MHz. T
SK
is referenced to MemClkOut falling edge. T
SA
and T
HA
are referenced to MemClkOut rising
edge.
2. The timing in this table assumes a single registered DIMM load on the outputs. To adjust the timing for unbuffered DIMMs,
use the following values by subtracting them from T
SA
and adding them to T
SK
and T
HA
:
5 loads adjust by 0.41ns
9 loads adjust by 1.12ns
18 loads adjust by 2.12ns
3. To obtain adjusted T
SA
values for lower clock frequencies, use 1/2 of the cycle time for the lower clock frequency and subtract
T
SK
maximum (0.5T
CYC
T
SK
max).
4. To obtain adjusted T
HA
values for lower clock frequencies, use 1/2 of the cycle time for the lower clock frequency and add
T
SK
minimum (0.5T
CYC
+ T
SK
min).
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
Signal Name
T
SK
(ns)
T
SA
(ns)
Minimum
T
HA
(ns)
Minimum
Minimum
Maximum
MemAddr00:13
BA0:2
BankSel0:1
ClkEn
CAS
RAS
WE
0.960
0.270
3.27
2.04
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