ZHCSBT2G November 2012 – October 2017 66AK2H06 , 66AK2H12 , 66AK2H14
PRODUCTION DATA.
The PASS PLL generates interface clocks for the Network Coprocessor. Using the PACLKSEL pin the user can select the input source of the PASS PLL as either the output of the Main PLL mux or the PASSCLK clock reference source. When coming out of power-on reset, PASS PLL comes out in a bypass mode and needs to be programmed to a valid frequency before being enabled and used.
PASS PLL power is supplied via the PASS PLL power-supply pin (AVDDA3). An external EMI filter circuit must be added to all PLL supplies. See Hardware Design Guide for KeyStone II Devices for detailed recommendations.
The PASS PLL block diagram is shown in Figure 11-29.