PEX8505-AA25BI Device Summary

1. General Information

• Manufacturer: PLX Technology (now part of Broadcom)
• Part Number: PEX8505-AA25BI
• Device Type: 5-Lane, 5-Port PCI Express Gen 1 Switch
• Package: 196-ball PBGA (Plastic Ball Grid Array)
• Package Size: 15 mm × 15 mm
• RoHS Compliant: Yes
• Silicon Revision: AA

2. Functional Overview

• PCI Express Specification Compliance:PCI Express Base Specification Revision 1.1PCI Local Bus Specification Revision 3.0PCI Power Management Interface Specification Revision 1.2PCI-to-PCI Bridge Architecture Specification Revision 1.2
• Switch Architecture: Non-blocking crossbar switch
• Port Configuration: Up to 5 ports, configurable as x1 or x2 lanes
• Upstream Port: Configurable (Port 0 recommended)
• Downstream Ports: Ports 1–4 (Hot Plug supported on Ports 1–3)
• Cut-Thru Latency: 210 ns (x1 to x1)
• Max Payload Size: Up to 1024 bytes
• Aggregate Bandwidth: 25 Gbps (2.5 Gbps/lane × 5 lanes × 2 for full duplex)

3. Power and Thermal

• Typical Power Consumption: 0.86 W
• Power Supply Voltages:1.0 V (Core and SerDes)1.0 V (SerDes Analog)1.0 V (SerDes Digital)3.3 V (I/O and PLL)
• Thermal Characteristics: Refer to datasheet Chapter 16 for thermal data and mechanical specifications

4. Features

Link and Physical Layer

• Supports x1 and x2 link widths
• Lane reversal and polarity inversion
• Hardware-based link training and initialization
• Supports L0, L0s, L1, L2/L3 Ready, and L3 link power states
• Active State Power Management (ASPM)

Error Handling and Debugging

• Advanced Error Reporting (AER)
• ECC support for internal memory
• JTAG boundary scan support
• Lane status LEDs (PEX_LANE_GOOD[4:0]#)
• Loopback modes (analog and digital)

Configuration Options

• Configuration via:Strapping pinsSerial EEPROM (SPI-compatible, up to 16 MB)I²C Slave interface (100 kbps)
• Supports dynamic register updates via I²C or EEPROM

Interrupt Support

• INTx emulation (PCI-compatible)
• Message Signaled Interrupts (MSI)
• Hot Plug events generate interrupts or PME messages

Hot Plug Support

• Available on Ports 1–3
• Supports:Attention ButtonPower ControllerMRL (Manual Retention Latch) SensorPresence DetectPower Fault DetectionPower and Attention LEDs

5. Pin Count and Layout

• Total Balls: 196
• Signal Groups:PCI Express: 23 ballsHot Plug: 27 balls (Ports 1–3)Serial EEPROM: 4 ballsI²C: 5 ballsJTAG: 5 ballsStrapping: 15 ballsPower and Ground: 89 ballsNo Connect: 18 balls

6. Register Access

• PCI Configuration Space: 256 bytes (offsets 00h–FFh)
• PCI Express Extended Configuration Space: 960 DWords (offsets 100h–FFFh)
• Access Mechanisms:PCI 3.0-compatible configurationPCI Express enhanced configurationDevice-specific memory-mapped configuration (128 KB total)

7. Applications

• Control plane systems
• I/O expansion cards
• Multi-function printers
• Industrial and medical systems
• Embedded systems and AMC modules

8. Ordering Information

• Part Number: PEX8505-AA25BI
• Package: 196-ball PBGA
• Temperature Range: Industrial (implied by datasheet context)