MSI H6M-P23 (B3) Specifications download pdf (Page 58)

3-6 Signal Description

3.2.6 PCI Interrupt Signals

Table 3.6 describes the PCI interrupt signals.

3.3 PCI-Related Signals

Table 3.7 describes the PCI-related signals.

Table 3.6 PCI Interrupt Signals

Signal Name BGA Position Type Description

INTA/ V3 O Refer to the PCI Local Bus Speciﬁcation, Version 3.0, and

the PCI-X Addendum to the PCI Local Bus Speciﬁcation,

Version 2.0, for complete signal descriptions.

Table 3.7 PCI-Related Signals

Signal Name BGA Position Type Description

ALT_INTA/ U3 O The PCI device asserts active LOW Alternate Interrupt

A to request service from the host device driver. This

signal is disabled when ZCR is disabled. ALT_INTA/ is an

open drain signal.

The interrupt request routing mode bits, bits [9:8] in the

PCI Host Interrupt Mask register, control the routing of

interrupt signals to INTA/ and/or ALT_INTA/.

ALT_GNT/ T5 I Active LOW Alternate Grant signal provides a grant

signal for ZCR implementations.

ZCR_EN/ T1 – The active LOW ZCR enable input conﬁgures the

LSISAS1064 for Zero Channel RAID operation. When this

input is asserted, the standard PCI signals INTA/ and

GNT/ are not used, and the alternate signals ALT_INTA/

and ALT_GNT/ are used. When this input is deasserted,

the chip is conﬁgured for standard PCI operation.

BZR_SET V21 – This signal provides the reference resistor node for the

PCI-X impedance controller.

BZVDD AA24 – This signal provides the reference resistor node for the

PCI-X impedance controller.

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MSI H6M-P23 (B3) Specifications Page 58