Signal Description
2.5
Hot Plug Interface
.
Table 2-5. General Hot Plug Interface A Signals – All Hot Plug Modes
Signal
Type
Description
HPA_SLOT[3]
I
Enable/Disable PCI Hot Plug Mode:
1 = Hot Plug Mode Enabled
0 = Hot Plug Mode Disabled
HPA_SLOT[2:0]
I
Hot Plug Mode / # of PCI Slots: Used in conjunction with HPA_SLOT[3]
signal to determine PCI Hot Plug Mode and number of PCI slots on a bus
segment.
HPA_SLOT[3:0] = Hot Plug Mode Enable/Disable, # of PCI slots
0000 = hot plug disabled, 1 slot (optional)
0001 = hot plug disabled, 2 slots (optional)
0010 = hot plug disabled, 3 slots (optional)
0011 = hot plug disabled, 4 slots (optional)
0100 = hot plug disabled, 5 slots (optional)
0101 = hot plug disabled, 6 slots (optional)
0110 = hot plug disabled, 7 slots (optional)
0111 = hot plug disabled, 8 slots (optional)
1000 = reserved
1001 = hot plug enabled, 1 slot (parallel mode)
1010 = hot plug enabled, 2 slots (parallel mode)
1011 = hot plug enabled, 3 slots (serial mode)
1100 = hot plug enabled, 4 slots (serial mode)
1101 = hot plug enabled, 5 slots (serial mode)
1110 = hot plug enabled, 6 slots (serial mode)
1111 = hot plug enabled, 1-slot-no-glue (parallel mode)
Table 2-6. Serial Mode Hot Plug Signals – Interface A – 3 to 6 Slots (Sheet 1 of 2)
Signal
Type
Description
HPA_SLOT[3:0]
I
Hot Plug Mode Enable / # of PCI Slots: Used to enable/disable hot plug
mode and to determine number of hot plug slots.
HPA_SLOT[3:0]:
1011 = hot plug enabled, 3 slots (serial mode)
1100 = hot plug enabled, 4 slots (serial mode)
1101 = hot plug enabled, 5 slots (serial mode)
1110 = hot plug enabled, 6 slots (serial mode)
HPA_PRST#
O
Primary Bus Reset Out (HPA_PRST#): This is asserted whenever the
primary side of the Intel® 6702PXH 64-bit PCI Hub goes through a reset,
even if hot plug is disabled. Resets the slot interface logic in hot plug serial
mode.
HPA_SIC
HPA_SID
O
I
Serial Input Clock: This signal is normally high. It pulses low to shift
external serial input shift register data one bit position. (The shift registers
should be similar to standard “74x165” series).
Serial Input Data: Data shifted in from external logic on HPA_SIC.
Intel® 6702PXH 64-bit PCI Hub Datasheet
19
INTEL [ INTEL ]
