Intel® 845G/845GL/845GV GMCH Chipset System Clock and AGP Characteristics
Intel® 845G/845GL/845GV GMCH Chipset System Clock and AGP Characteristics - The figure shows a block diagram of an 845G chipset-based system (enlarged click).
The type of this series which is known as Intel 82845G GMCH has the following clocks. There are:
• 100/133 MHz, Spread spectrum, Low voltage (0.7 V) Differential HCLKP/HCLKN for PSB
• 66.667 MHz, Spread spectrum, 3.3 V GCLKIN for hub interface and AGP
• 48 MHz, Non-Spread spectrum, 3.3 V DREFCLK for the Display frequency syntheses
• Up to 85 MHz, 1.5 V DVOBC_CLKINT for TV-Out mode
The AGP Electrical characteristics shows that the 4X data transfers use 1.5 V signaling levels. Also, The GMCH supports 1X/2X/PCI data transfers using 1.5 V signaling levels.
The table below shows the data rates and signaling levels supported by the GMCH:
|Data Rate||Signaling Level|
|1.5 V||3.3 V|