SPRS814D March 2012 – October 2019 TMS320C6655 , TMS320C6657
PRODUCTION DATA.
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Some of the clock inputs are required to be present for the device to initialize correctly, but behavior of many of the clocks is contingent on the state of the boot configuration pins. Table 6-4 describes the clock sequencing and the conditions that affect the clock operation. All clock drivers should be in a high-impedance state until CVDD is at a valid level and that all clock inputs either be active or in a static state with one leg pulled low and the other connected to CVDD.
CLOCK | CONDITION | SEQUENCING |
---|---|---|
DDRCLK | None | Must be present 16 µs before POR transitions high. |
CORECLK | None | CORECLK used to clock the core PLL. It must be present 16 µs before POR transitions high. |
SRIOSGMII
CLK |
SGMII will not be used. SRIO will be used as a boot device. | SRIOSGMIICLK must be present 16 µs before POR transitions high. |
SGMII will not be used. SRIO will be used after boot. | SRIOSGMIICLK is used as a source to the SRIO SERDES PLL. It must be present before the SRIO is removed from reset and programmed. | |
PCIECLK | PCIE will be used as a boot device. | PCIECLK must be present 16 µs before POR transitions high. |
PCIE will be used after boot. | PCIECLK is used as a source to the PCIE SERDES PLL. It must be present before the PCIE is removed from reset and programmed. | |
PCIE will not be used. | PCIECLK is not used and should be tied to a static state. | |
MCMCLK | HyperLink will be used as a boot device. | MCMCLK must be present 16 µs before POR transitions high. |
HyperLink will be used after boot. | MCMCLK is used as a source to the MCM SERDES PLL. It must be present before the HyperLink is removed from reset and programmed. | |
HyperLink will not be used. | MCMCLK is not used and should be tied to a static state. |