5-2
PmPPC440: PCI/PCI-X Interface
April 2005
5.3 PCI Bus Control Signals
The following signals for the PCI interface are available on connectors P11–P13.
Refer to the PCI specification for details on using these signals. All signals are bi-
directional unless otherwise stated.
NOTE.
A sustained three-state line is driven high for one clock cycle before
float.
440 ResetOut
CPU Reset. This bit allows the PCI ResetOut signal to be driven when the
PPC440GP ResetOut signal is driven (1=enable, 0=disable). The reset
value is zero.
SW
Software Reset. This bit allows the PCI ResetOut signal to be driven when
an on-board hard reset is caused by a write to the Reset Command regis-
ter (1=enable, 0=disable). The reset value is zero.
FP
Front Panel Reset. This bit allows the PCI ResetOut signal to be driven
when an on-board hard reset is caused by the front panel push button
(1=enable, 0=disable). The reset value is one.
ACK64*, REQ64*
These output signals are used to tell a 64-bit PCI device whether to use
the 64-bit or the 32-bit data width. Since the PmPPC440 is a 64-bit
board, these signals are tied off to indicate the 64-bit data width.
AD00-AD31
ADDRESS and DATA bus (bits 0-31). These three-state lines are used for
both address and data handling. A bus transaction consists of an address
phase followed by one or more data phases.
C/BE0*-C/BE3*
BUS COMMAND and BYTE ENABLES. These three-state lines have differ-
ent functions depending on the phase of a transaction. During the
address phase of a transaction these lines define the bus command. Dur-
ing a data phase the lines are used as byte enables.
CLK
CLOCK. This input signal to the PmPPC440 provides timing for PCI
transactions.
DEVSEL*
DEVICE SELECT. This sustained three-state signal indicates when a
device on the bus has been selected as the target of the current access.
EREADY
READY. This signal is an input for Monarch modules and an output for
non-Monarch modules. It indicates that all modules are initialized and
the PCI bus is ready to be enumerated.
FRAME*
CYCLE FRAME. This sustained three-state line is driven by the current
master to indicate the beginning of an access, and continues to be
asserted until transaction reaches its final data phase.
Содержание PmPPC440
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