ZHCSBT2G November 2012 – October 2017 66AK2H06 , 66AK2H12 , 66AK2H14
PRODUCTION DATA.
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 11-4 describes the clock sequencing and the conditions that affect clock operation. All clock drivers should be in a high-impedance state until CVDD is at a valid level and that all clock inputs be either active or in a static state with one leg pulled to ground and the other connected to CVDD.
CLOCK | CONDITION | SEQUENCING |
---|---|---|
DDR3ACLK | None | Must be present 16 µsec before POR transitions high. |
DDR3BCLK | None | Must be present 16 µsec before POR transitions high. |
SYSCLK | CORECLKSEL = 0 | SYSCLK is used to clock the core PLL. It must be present 16 µsec before POR transitions high. |
CORECLKSEL = 1 | Reserved. | |
ALTCORECLK | CORECLKSEL = 0 | ALTCORECLK is not used and should be tied to a static state. |
CORECLKSEL = 1 | ALTCORECLK is used to clock the core PLL. It must be present 16 µsec before POR transitions high. | |
PASSCLK | PASSCLKSEL = 0 | PASSCLK is not used and should be tied to a static state. |
PASSCLKSEL = 1 | PASSCLK is used as a source for the PASS PLL. It must be present before the PASS PLL is removed from reset and programmed. | |
SRIOSGMIICLK | An SGMII port will be used. | SRIOSGMIICLK must be present 16 µsec before POR transitions high. |
SGMII will not be used. SRIO will be used as a boot device. | SRIOSGMIICLK must be present 16 µsec 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. | |
SGMII will not be used. SRIO will not be used. | SRIOSGMIICLK is not used and should be tied to a static state. | |
PCIECLK | PCIE will be used as a boot device. | PCIECLK must be present 16 µsec 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. | |
HYPCLK | HyperLink will be used as a boot device. | HYPCLK must be present 16 µsec before POR transitions high. |
HyperLink will be used after boot. | HYPCLK is used as a source to the HyperLink SerDes PLL. It must be present before the HyperLink is removed from reset and programmed. | |
HyperLink will not be used. | HYPCLK is not used and should be tied to a static state. |