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MSC8154E Datasheet, PDF (49/68 Pages) Freescale Semiconductor, Inc – Quad-Core Digital Signal Processor with Security | |||
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Electrical Characteristics
Table 35 presents the RGMII AC timing specification for applications required non-delayed clock on board.
Table 35. RGMII at 1 GHz2 with No On-Board Delay3 AC Timing Specifications
Parameter/Condition
Symbol
Min
Typ
Max Unit
Data to clock output skew (at transmitter)4
Data to clock input skew (at receiver)4
tSKEWT
â2,6
â
â1.0
ns
tSKEWR
â0.5
â
0.5
ns
Notes: 1. At recommended operating conditions with VDDIO of 2.5 V ± 5%.
2. RGMII at 100 MHz support is guaranteed by design.
3. GCR4 should be programmed as 0x000CC330.
4. This implies that PC board design requires clocks to be routed with no additional trace delay
Figure 25 shows the RGMII AC timing and multiplexing diagrams.
GTX_CLK
(At Transmitter)
TXD[3:0]
TX_CTL
txd[3:0] txd[7:4]
tSKEWT
RXD[3:0]
rxd[3:0] rxd[8:5]
RX_CTL
RX_CLK
(At Receiver)
Figure 25. RGMII AC Timing and Multiplexing
tSKEWR
2.6.6 SPI Timing
Table 36 lists the SPI input and output AC timing specifications.
Table 36. SPI AC Timing Specifications
Parameter
Symbol 1
Min
SPI outputs validâMaster mode (internal clock) delay
tNIKHOV
â
SPI outputs holdâMaster mode (internal clock) delay
tNIKHOX
0.5
SPI outputs validâSlave mode (external clock) delay
tNEKHOV
â
SPI outputs holdâSlave mode (external clock) delay
tNEKHOX
2
SPI inputsâMaster mode (internal clock) input setup time
tNIIVKH
12
Max
Unit
Note
6
ns
2
â
ns
2
12
ns
2
â
ns
2
â
ns
â
MSC8154E Quad-Core Digital Signal Processor with Security Data Sheet, Rev. 0
Freescale Semiconductor
49
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