Intel CONTROLLERS 413808 - Manual (Page 81)

Intel ® 413808 and 413812 I/O Controllers in TPER Mode
October 2007 Developer’s Manual
Order Number: 317805-001US 81
Address Translation Unit (PCI-X)—Intel
®
413808 and 413812
2.4.1.1 Compact PCI Hot-Swap Mode Select
HS_SM# must be asserted (0b) to enable Hot-Swap functionality.
HS_FREQ[1:0] pins allow the 4138xx to determine the cPCI backplane operating
frequency without needing to see a PCI-X initialization pattern. These pins are only
valid when HS_SM# is sampled as 0b during P_RST#.
Table 8. HS_FREQ Encoding
a
a. Hot-Swap is not supported in PCI-X Mode 2.
HS_FREQ[1:0] P_M66EN Operating Mode Bus Frequency PCSR[19:16]
11 0 PCI 33 MHz 1111
11 1 PCI 66 MHz 1111
10 - PCI-X (Mode 1) 66 MHz 1110
01 - PCI-X (Mode 1) 100 MHz 1101
00 - PCI-X (Mode 1) 133 MHz 1100