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PCI Bus Control Signals
5-3
10003794-05
GNT*
GRANT. This input signal indicates that access to the bus has been
granted to a particular master. Each master has its own GNT*.
IDSEL
INITIALIZATION DEVICE SELECT. This input signal acts as a chip select
during configuration read and write transactions.
INTA*, INTB*,
INTC*, INTD*
PMC INTERRUPTS A, B, C, D. These interrupt lines are used by PCI
devices to interrupt the host processor.
IRDY*
INITIATOR READY. This sustained three-state signal indicates that the
bus master is ready to complete the data phase of the transaction.
M66EN
ENABLE 66MHZ. When grounded, this signal prevents 66MHz operation
of the PCI bus.
MONARCH*
MONARCH. When this signal is grounded, it indicates that the
PmPPC440 is a Monarch and must provide PCI bus enumeration and
interrupt handling.
LOCK*
LOCK. This sustained three-state signal indicates that an automatic oper-
ation may require multiple transactions to complete.
PAR
PARITY. This is even parity across AD00-AD31 and C/BE0-C/BE3*. Parity
generation is required by all PCI agents. This three-state signal is stable
and valid one clock after the address phase, and one clock after the bus
master indicates that it is ready to complete the data phase (either IRDY*
or TRDY* is asserted). Once PAR is asserted, it remains valid until one
clock after the completion of the current data phase.
PCIXCAP
PCI-X CAPABILITY. This line indicates which type of PCI/PCI-X card is
attached to the PCI/PCI-X bus. If it is pulled up to 3.3V, the bus operates
in 133-MHz PCI-X mode. If the line is grounded, the bus operates in con-
ventional PCI mode. If the line is connected to a voltage divider, the bus
operates in 66-MHz PCI-X mode.
PERR*
PARITY ERROR. This sustained three-state line is used to report parity
errors during all PCI transactions.
PME*
POWER MANAGEMENT EVENT. This optional open-drain signal (pull-
up resistor required) allows a device to request a change in the power
state. Devices must be enabled by software before asserting this signal.
PRESENT*
PRESENT. When grounded, this signal indicates to a carrier that a PMC
module is installed.
RESET_OUT*
RESET OUTPUT. This optional output signal may be used to support
another source. To avoid reset loops, do not use RST* to generate
RESET_OUT*.
REQ64*
This optional output signal is used to tell a 64-bit PCI device whether to
use the 64-bit or the 32-bit data width.
Summary of Contents for PmPPC440
Page 1: ...PmPPC440 PowerPC Based Processor PMC Module User s Manual April 2005 ...
Page 3: ...PmPPC440 PowerPC Based Processor PMC Module User s Manual April 2005 ...
Page 14: ...viii PmPPC440 Contents ...
Page 34: ...2 14 PmPPC440 Setup April 2005 ...
Page 42: ...3 8 PmPPC440 PPC440GP Processor April 2005 ...
Page 56: ...6 4 PmPPC440 Ethernet Interface April 2005 ...