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1. Board Design
1.2
PCI Interface
1.2.1
Overview
The PCI Interface is implemented on the board with four slots, in which one is an R/A mounted
connector on the top of the board. All PCI connectors are compliant with the PCI 3.0 specification.
Appropriate clearance is provided such that up to four PCI cards can be inserted for testing while the
board is in an open-chassis standard ATX case.
The PCI Interface supports four slots operating at 25, 33, 50, or 66 MHz.
1.2.2
IDSEL Signals
IDSEL signals are connected in the following order:
•
Slot 0 – R/A connector top slot: 150 ohms to AD16 (Device 0)
•
Slot 1 – 150 ohms to AD17 (Device 1)
•
Slot 2 – 150 ohms to AD19 (Device 3)
•
Slot 3 – 150 ohms AD18 (Device 2)
1.2.3
Interrupt Signals
The PCI interrupt signals are connected to the slots as shown in the following table.
Table 1: PCI Interrupt Routing
PEB383
A
B
C
D
1.2.4
Pull-up Signals
The following pull-ups are added to the PCI bus, in which a value of 8.2Kohm is used.
Table 2: PCI Pull-up Signals
Signal
PCI_REQ#[0:3]
PCI_GNT#[0:3]
PCI_FRAME#
PCI_IRDY#, PCI_TRDY#
Integrated Device Technology
www.idt.com
Slot 0
Slot 1
A
B
B
C
C
D
D
A
Description
Bus request
Bus grant
Control signal
Control signal
Slot 3
Slot 4
D
C
A
D
B
A
C
B
PEB383 (QFN) Evaluation Board User Manual
9
602080_MA001_01
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