PCI External Signals
MPC5200B Users Guide, Rev. 1
Freescale Semiconductor 10-3
For detailed description of the PCI bus signals, see the PCI Local Bus Specification, Revision 2.2.
10.2.1 PCI_AD[31:0] - Address/Data Bus
The PCI_AD[31:0] lines are a time multiplexed address data bus. The address is presented on the bus during the address phase while the data
is presented on the bus during one or more data phases.
10.2.2 PCI_CBE[3:0] - Command/Byte Enables
The PCI_CBE[3:0] lines are time multiplexed. The PCI command is presented during the address phase and the byte enables are presented
during the data phase.
10.2.3 PCI_DEVSEL - Device Select
The PCI_DEVSEL signal is asserted active low when MPC5200B decodes that it is the target of a PCI transaction from the address presented
on the PCI bus during the address phase.
10.2.4 PCI_FRAME - Frame
The PCI_FRAME signal is asserted by a PCI initiator to indicate the beginning of a transaction. It is deasserted when the initiator is ready to
complete the final data phase.
10.2.5 PCI_IDSEL - Initialization Device Select
The PCI_IDSEL signal is asserted during a PCI Type 0 Configuration Cycle to address the PCI Configuration header.
10.2.6 PCI_IRDY - Initiator Ready
The PCI_IRDY signal is asserted to indicate that the PCI initiator is ready to transfer data. During a write operation, assertion indicates that
the master is driving valid data on the bus. During a read operation, assertion indicates that the master is ready to accept data.
10.2.6.1 PCI_PAR - Parity
The PCI_PAR signal indicates the parity of data on the PCI_AD[31:0] and PCI_CBE[3:0] lines.
10.2.7 PCI_CLK - PCI Clock
The PCI_CLK signal is the clock for the internal PCI Controller and the external PCI system. The PCI clock is also used as reference clock
for the LocalPlus synchronous interfaces (Burst Flash, ATA). The PCI_CLK is always sourced by the MPC5200B.
10.2.8 PCI_PERR - Parity Error
The PCI_PERR signal, if enabled, is asserted when a data phase parity error is detected.
10.2.9 PCI_RST - Reset
The PCI_RST signal is asserted active low by MPC5200B to reset the PCI bus. This signal is asserted after MPC5200B reset and must be
negated to enable usage of the PCI bus. An external shared pull-up resistor is required on this pin.
10.2.10 PCI_SERR - System Error
The PCI_SERR signal, if enabled, is asserted by the MPC5200B only when an address phase parity error is detected.
10.2.11 PCI_STOP - Stop
The PCI_STOP signal is asserted by the currently addressed target to indicate that it wishes to stop the current transaction.
10.2.12 PCI_TRDY - Target Ready
The PCI_TRDY signal is asserted by the currently addressed target to indicate that it is ready to complete the current data phase.