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SA1110 Datasheet(PDF) 68 Page - Intel Corporation |
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SA1110 Datasheet(HTML) 68 Page - Intel Corporation |
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68 / 406 page  8-2 SA-1110 Developer’s Manual Clocks 8.1 Intel® StrongARM SA-1110 Crystal Oscillators The SA-1110 clocks are derived from two crystals connected to on–chip oscillators. The first clock source is a 3.6864-MHz crystal that feeds the CPU PLL and the 48-MHz PLL. The CPU PLL multiplies the oscillator output up to the core frequency. This frequency is then divided down to generate baud rates for the serial ports. If the UARTs are not being used or do not need standard baud rates, then the 3.6864 -Hz oscillator may be replaced with a 3.5795-MHz crystal to generate frequencies as shown in Table 8-1.The second oscillator is connected to a 32.768-kHz crystal. The output of this oscillator clocks the power management controller and the real-time clock (RTC). See Appendix B, “3.6864–MHz Oscillator Specifications” and Appendix C, “32.768–kHz Oscillator Specifications” for detailed specifications of the crystal oscillators. 8.2 Core Clock Configuration Register The core clock frequency is configured by software through the core clock configuration field (CCF 4:0) in the power manager phase-locked loop (PLL) configuration register (PPCR). This field should be programmed during the boot sequence for the desired full-speed operation. nRESET clears the field by selecting the lowest frequency operation. See Section 9.5, “Power Manager” on page 9-26 for the physical address used to access this register. Table 8-1 shows the core clock frequency as a function of the CCF setting. The actual core clock (DCLK) can switch between being driven by the high speed core clock (CCLK, set by CCF 4:0) and the memory clock (MCLK), which runs at half the frequency of CCLK. CCLK is used except when the SA-1110 is waiting for fills to complete after a cache miss. Table 8-1. Core Clock Configurations CCF 4:0 Core Clock Frequency in MHz 3.6864-MHz Crystal Oscillator 3.5795-MHz Crystal Oscillator 00000 59.0 57.3 00001 73.7 71.6 00010 88.5 85.9 00011 103.2 100.2 00100 118.0 114.5 00101 132.7 128.9 00110 147.5 143.2 00111 162.2 157.5 01000 176.9 171.8 01001 191.7 186.1 01010 206.4 200.5 01011 221.2 214.8 01100– 11111 Not supported. — |
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