Functional Description
EBC2
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© 2005 Kontron Modular Computers GmbH
ID 29022, Rev. 01
26873
.02.VC.050120/135424
P R E L I M I N A R Y
2.3.1.8
PCI Interface
In contrast to all other PCI based modules, the E²Brain™ modules are capable of both PCI
Master mode and PCI Agent mode. PCI Agent mode can be selected by setting the AGENT
signal on the System Interface to low.
In PCI Master mode (default by the EBC2), the E²Brain™ module operates as the host, initial-
izing and controlling up three PCI devices on the EBC2, whereas, in the Agent mode, the
E²Brain™ module itself operates as a PCI target.
The following table identifies the EBC2 PCI bus signals and provides a short description of
each signal.
Table 2-9: PCI Interface Signal Description
SIGNAL
DESCRIPTION
AD [0:31]
PCI multiplexed address and data bus
INT [A, B, C, D]#
PCI interrupt requests
C/BE [0:3]#
PCI multiplexed bus command and byte enable
IRDY#
Initiator Ready indicates the current bus master is ready to complete the current data phase.
TRDY#
Target Ready indicates the selected device is ready to complete the current data phase.
PCI-RST#
PCI Reset signal, is also used for LPC devices
PCI-CLK-OUT- [1:3] PCI clock Outputs for up to 3 external bus mastering PCI devices. All PCI signals except
PCI_RST#, and INT [A, B, C, D] # are sampled on the rising edge. (Consider routing guide-
lines for Carrier board)
FRAME#
Indicate the beginning and duration of a PCI access.
STOP#
Indicates the target is requesting the master to stop the current transaction
DEVSEL#
Device select generated by the target when cycle refers to its own address.
REQ [1:3]#
PCI Arbiter requests
GNT [1:3]#
PCI Arbiter grants
PAR
Calculated/Checked Parity
PERR#
Parity Error
LOCK#
PCI Lock resource signal
SERR#
System Error
REQ64#
PCI request for a 64-bit access
ACK64#
PCI grant for a 64-bit access
PCI-CLK-IN
PCI clock input, used in agent mode
AGENT
PCI-agent mode logic input, 0 -> PCI agent mode, 1 -> system controller
M66EN
66 MHz enable
PCI-X-CAP
PCI-X capable
