Signal Description
Table 2-7. Parallel Mode Hot Plug Signals – Interface A and B – 1 to 2 Slots (Sheet 3 of 4)
Signal
Type
Description
PAIRQ_[9]#/
I
Slot 1 PCIXCAP2: Determines if the first hot plug slot is PCI-X capable,
and if so, whether it can operate at 133 MHz. PCIXCAP1 and PCIXCAP2
represent a decoded version of the three-state PCIXCAP pin present on
each slot. PCIXCAP2 represents whether the PCIXCAP pin was ground or
not ground (i.e., PCI-X capable), and PCIXCAP1 represents whether the
PCIXCAP pin was “low” (66 MHz only) or high (133 MHz capable). The
system initially powers up at 33 MHz PCI, and all hot plug slots are scanned
by firmware. If the system is capable, the bus is reset to run in the
appropriate PCI-X mode. These pins are used only in one-slot-no-glue,
single-slot parallel or dual-slot parallel hot plug mode (HPx_SLOT[3:0] =
1111,1001 or 1010).
HAPCIXCAP2_1
PBIRQ_[9]#/
HBPCIXCAP2_1
HPA_SID/
I
I
I
Slot 2 PCIXCAP1: Determines if the first hot plug slot is PCI-X capable,
and if so, whether it can operate at 133 MHz. PCIXCAP1 and PCIXCAP2
represent a decoded version of the three-state PCIXCAP pin present on
each slot. PCIXCAP2 represents whether the PCIXCAP pin was ground or
not ground (i.e., PCI-X capable), and PCIXCAP1 represents whether the
PCIXCAP pin was “low” (66 MHz only) or high (133 MHz capable). The
system initially powers up at 33 MHz PCI, and all hot plug slots are scanned
by firmware. If the system is capable, the bus is reset to run in the
appropriate PCI-X mode. These pins are used only in dual-slot parallel hot
plug mode (HPx_SLOT[3:0] = 1010).
HAPCIXCAP1_2
HPB_SID/
HBPCIXCAP1_2
HPA_SOC/
Slot 2 PCIXCAP2: Determines if the second hot plug slot is PCI-X capable,
and if so, whether it can operate at 133 MHz. PCIXCAP1 and PCIXCAP2
represent a decoded version of the three-state PCIXCAP pin present on
each slot. PCIXCAP2 represents whether the PCIXCAP pin was ground or
not ground (i.e., PCI-X capable), and PCIXCAP1 represents whether the
PCIXCAP pin was “low” (66 MHz only) or high (133 MHz capable). The
system initially powers up at 33 MHz PCI, and all hot plug slots are scanned
by firmware. If the system is capable, the bus is reset to run in the
appropriate PCI-X mode. These pins are used only in the dual-slot parallel
hot plug mode (HPx_SLOT[3:0] = 1010).
HAPCIXCAP2_2
HPB_SOC/
HAPCIXCAP2_2
HPA_SLOT[1]/
HAPRSNT1_1#
Slot 1 PRESENT1#: Input signal (optional). Used in conjunction with
HxPRSNT2_1# to indicate to the Intel® 6700PXH 64-bit PCI Hub whether
an add-on card is installed in the first hot plug slot and its power
requirements.
HPB_SLOT[1]/
HBPRSNT1_1#
Only used when in one-slot-no-glue, single-slot or dual-slot parallel hot plug
mode (HPx_SLOT[3:0] = 1111, 1001 or 1010).
PAREQ_[5]#/
HAPRSNT1_2#
I
I
Slot 2 PRESENT1#: Input signal (optional). Used in conjunction with
HxPRSNT2_2# to indicate to the Intel® 6700PXH 64-bit PCI Hub whether
an add-on card is installed in the second hot plug slot and its power
requirements. Only used when in dual-slot parallel hot plug mode
(HPx_SLOT[3:0] = 1010).
PBREQ_[5]#/
HBPRSNT1_2#
PAREQ_[3]#/
Slot 1 PRESENT2#: Input signal (optional). Used in conjunction with
HxPRSNT1_1# to indicate to the Intel® 6700PXH 64-bit PCI Hub whether
an add-on card is installed in the first hot plug slot and its power
requirements. This signal is directly connected to the present bits on the
PCI/PCI-X add-on card.
HAPRSNT2_1#
PBREQ_[3]#/
HBPRSNT2_1#
Only used when in one-slot-no-glue, single-slot or dual-slot parallel hot plug
mode (HPx_SLOT[3:0] = 1111, 1001 or 1010).
26
Intel® 6700PXH 64-bit PCI Hub Datasheet
INTEL [ INTEL ]
