PI7C9X20505GPBNDE Pericom Semiconductor, PI7C9X20505GPBNDE Datasheet - Page 32

• Manufacturer Part Number: PI7C9X20505GPBNDE
• Description: IC PCIE PACKET SWITCH 256BGA
• Manufacturer: Pericom Semiconductor
• Series: GreenPacket™r

Specifications of PI7C9X20505GPBNDE

• Applications: Data Transport
• Interface: Advanced Configuration Power Interface (ACPI)
• Package / Case: 256-PBGA
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -

6.2 SMBus INTERFACE
The PI7C9X20505GP provides the System Management Bus (SMBus), a two-wire interface through which a simple
device can communicate with the rest of the system. The SMBus interface on the PI7C9X20505GP is a
bi-directional slave interface. It can receive data from the SMBus master or send data to the master. The interface
allows full access to the configuration registers. A SMBus master, such as the processor or other SMBus devices,
can read or write to every RW configuration register (read/write register). In addition, the RO and HwInt registers
(read-only and hardware initialized registers) that can be auto-loaded by the EEPROM interface can also be read
and written by the SMBus interface. This feature allows increases in the system expandability and flexibility in
system implementation.
The SMBus interface on the PI7C9X20505GP consists of one SMBus clock pin (SMBCLK), a SMBus data pin
(SMBDATA), and 3 SMBus address pins (GPIO[5:7]). The SMBus clock pin provides or receives the clock signal.
The SMBus data pin facilitates the data transmission and reception. Both of the clock and data pins are
bi-directional. The SMBus address pins determine the address to which the PI7C9X20505GP responds to. The
SMBus address pins generate addresses according to the following table:
June 2009 – Revision 1.5
Pericom Semiconductor
Table 6-1 SMBus Address Pin Configuration
Figure 6-1 SMBus Architecture Implementation on PI7C9X20505GP
BIT
0
1
2
3
4
5
6
SMBus Address
GPIO[5]
GPIO[6]
GPIO[7]
1
0
1
1
PI6C9X20505GP
SMBDATA
SMBCLK
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(SMBus Master)
Processor
5Port-5Lane PCI Express Switch
Other SMBus
Devices
GreenPacket
PI7C9X20505GP
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