MPC8280 datasheet(254/1386 Pages) FREESCALE

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External Signals

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

6-12

Freescale Semiconductor

L_A24

PCI_REQ1

CPCI_HS_ES

Local bus address 24—Local bus address bit 24 output pin. In the local address bus bit 14 is most

significant and bit 31 is least significant.

PCI arbiter request 1—PCI request 1 input pin. When the MPC8280’s internal PCI arbiter is used,

assertion of this pin indicates that an external PCI device is requesting the PCI bus.

CompactPCI Hot Swap Ejector Switch—Hot Swap Ejector Switch input pin. In a CompactPCI

system, when the MPC8280’s internal PCI arbiter is not used, this pin is used for the Hot Swap

interface to connect to the ejector switch logic.

0 Switch is closed

1 Switch is open

Important note: When functioning as the CPCI_HS_ES input, this signal must be filtered

(debounced) by an external circuit. Do not connect this input directly to the ejector switch. The

input must be a monotonically rising/falling signal.

L_A25

PCI_GNT0

Local bus address 25—Local bus address bit 25 output pin. In the local address bus bit 14 is most

significant and bit 31 is least significant.

PCI arbiter grant 0—PCI grant 0 input/output pin. When the MPC8280’s internal PCI arbiter is

used, this is an output pin. In this mode, assertion of PCI_GNT0 indicates that an the external

PCI device that requested the PCI bus with PCI_REQ0 is granted the bus. When an external PCI

arbiter is used, this is an input pin. In this mode, assertion of PCI_GNT0 indicates that the

MPC8280’s PCI interface is granted the PCI bus.

L_A26

PCI_GNT1

CPCI_HS_LED

Local bus address 26—Local bus address bit 26 output pin. In the local address bus bit 14 is most

significant and bit 31 is least significant.

PCI arbiter grant 1—PCI grant 1 output pin. When the MPC8280’s internal PCI arbiter is used,

assertion of PCI_GNT1 indicates that the external PCI device that requested the PCI bus with

PCI_REQ1 pin is granted the bus.

CompactPCI Hot Swap LED—Hot Swap LED output pin. In CompactPCI system, when the

MPC8280’s internal PCI arbiter is not used, this pin is used for the Hot Swap interface to connect

to the Hot Swap LED. The Hot Swap pins are not available when the internal arbiter is used.

0 LED is off

1 LED is on

L_A27

PCI_GNT2

CPCI_HS_ENUM

Local bus address 27—Local bus address bit 27 output pin. In the local address bus bit 14 is most

significant and bit 31 is least significant.

PCI arbiter grant 2—PCI grant 2 output pin. When the MPC8280’s internal PCI arbiter is used,

assertion of PCI_GNT2 indicates that the external PCI device that requested the PCI bus with

PCI_REQ2 pin is granted the bus.

CompactPCI Hot Swap Enumerator—Hot Swap ENUM output pin. In CompactPCI system, when

the MPC8280’s internal PCI arbiter is not used, this pin is used for the Hot Swap interface to

connect to the host as the enumeration request.

Table 6-1. External Signals (continued)

Signal

Description

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