Intel Pentium 4 Processor CK00 Clock Synthesizer/Driver Design Guidelines

CK00 Clock Synthesizer/Driver Design Guidelines
Page 42
Table 6.8 Select Functions –
CKFF
SELq SELr SELs Description Details
0 0 0 All outputs on All outputs on
0 0 1 Top 8 PCI off Pins 6,7,10,11,14,15,17,18 held LOW
0 1 0 Top 6 PCI off Pins 6,7,10,11,14,15 held LOW
0 1 1 All PCI off All PCI outputs Held LOW
1 0 0 Hi-Z All outputs high impedance
1 0 1 Top one 66MHz off Pin 51 held LOW
1 1 0 All 14MHz off Pins 55,54 held LOW
1 1 1 One 48MHz off Pin 37 held LOW
These select pins should have priority over SMBus in conditions in which the select pins are
causing an output to be in an OFF condition.