参数资料
型号: MSC8144ADS
厂商: Freescale Semiconductor
文件页数: 58/80页
文件大小: 0K
描述: ADS FOR MSC8144 DEVICE
标准包装: 1
类型: DSP
适用于相关产品: MSC8144
所含物品: AMC 卡、电源、缆线、USB TAP、硬件和说明文档
ETHCLOCK
ETHSYNC_IN
ETHRXD
t SMDVKH
Valid
t SMDXKH
t SMXR
ETHSYNC
ETHTXD
Valid
Figure 30. SMII Mode Signal Timing
Valid
2.6.10.6
RGMII AC Timing Specifications
Table 45 presents the RGMII AC timing specifications for applications requiring an on-board delayed clock.
Table 45. RGMII with On-Board Delay AC Timing Specifications
Parameter/Condition
Data to clock output skew (at transmitter)
Data to clock input skew (at receiver) 2
Symbol
t SKEWT
t SKEWR
Min
-0.5
0.9
Typ
Max
0.5
2.6
Unit
ns
ns
Notes:
1.
2.
3.
At recommended operating conditions with LV DD of 2.5 V +/- 5%.
This implies that PC board design requires clocks to be routed such that an additional trace delay of greater than 1.5 ns is
added to the associated clock signal.
GCR4 should be programmed as 0x00001004.
Table 46 presents the RGMII AC timing specification for applications required non-delayed clock on board.
Table 46. RGMII with No On-Board Delay AC Timing Specifications
Parameter/Condition
Data to clock output skew (at transmitter)
Symbol
t SKEWT
Min
–2.6
Typ
Max
–0.9
Unit
ns
Data to clock input skew (at receiver)
2
t SKEWR
–0.5
0.5
ns
Notes:
58
1.
2.
3.
At recommended operating conditions with LV DD of 2.5 V +/- 5%.
This implies that PC board design will require clocks to be routed with no additional trace delay
GCR4 should be programmed as 0x0004C130.
MSC8144 Quad Core Digital Signal Processor Data Sheet, Rev. 16
Freescale Semiconductor
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