Signal Description
2.13.1
Mode Determination
The standard hot plug controller is enabled and the mode selected through pin strappings that are
sampled on the rising edge of PWROK signal. Table 2-24 shows the information. When the
standard hot plug controller is disabled (HPA_SLOT[3] = “0”), the standard hot plug capability
registers and the working register set are hidden from software and the standard hot plug controller
is essentially disabled. The number of standard hot plug slots the controller handles is logged into
the slot configuration register at offset 0Ch in the SHPC working register set. This register is a
read-only register and cannot be written to by BIOS to change the mode of operation of the
controller in the Intel® 6702PXH 64-bit PCI Hub (between serial and parallel).
Table 2-24. Hot Plug Mode Settings
# of Slots (Intel® 6702PXH 64-bit
PCI Hub SHPC Mode)
HPA_SLOT[3:0]
Slot Configuration Register [4:0]
Hot Plug Disabled (see Note)
0000
0001
0010
0011
0100
0101
0110
0111
1 Slot
2 Slots
3 Slots
4 Slots
5 Slots
6 Slots
7 Slots
8 Slots
00001
00010
00011
00100
00101
00110
00111
01000
Hot Plug Enabled
1000
1001
1010
1011
1100
1101
1110
1111
Reserved
1-slot (parallel)
2-slot (parallel)
3-slot (serial)
N/A
00001
00010
00011
00100
00101
00110
00001
4-slot (serial)
5-slot (serial)
6-slot (serial)
1-slot-no-glue (parallel)
NOTE: HPA_SLOT[2:0] are optional when Hot Plug is disabled.
Intel® 6702PXH 64-bit PCI Hub Datasheet
45
INTEL [ INTEL ]
