PI7C7300DNAE Pericom Semiconductor, PI7C7300DNAE Datasheet - Page 33

• Manufacturer Part Number: PI7C7300DNAE
• Description: IC PCI-PCI BRIDGE 3PORT 272-BGA
• Manufacturer: Pericom Semiconductor

Specifications of PI7C7300DNAE

• Applications: *
• Interface: *
• Voltage - Supply: *
• Package / Case: 272-PBGA
• Mounting Type: Surface Mount
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 3 V to 3.6 V
• Supply Current (max): 660 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.8
4.8.1
Pericom Semiconductor
PI7C7300D can recognize fast back-to-back read transactions.
CONFIGURATION TRANSACTIONS
Configuration transactions are used to initialize a PCI system. Every PCI device
has a configuration space that is accessed by configuration commands. All registers are
accessible in configuration space only.
In addition to accepting configuration transactions for initialization of its own
configuration space, the PI7C7300D also forwards configuration transactions for device
initialization in hierarchical PCI systems, as well as for special cycle generation.
To support hierarchical PCI bus systems, two types of configuration transactions are
specified: Type 0 and Type 1.
Type 0 configuration transactions are issued when the intended target resides on the same
PCI bus as the initiator. A Type 0 configuration transaction is identified by the
configuration command and the lowest two bits of the address set to 00b.
Type 1 configuration transactions are issued when the intended target resides on another
PCI bus, or when a special cycle is to be generated on another PCI bus. A Type 1
configuration command is identified by the configuration command and the lowest two
address bits set to 01b.
The register number is found in both Type 0 and Type 1 formats and gives the DWORD
address of the configuration register to be accessed. The function number is also included
in both Type 0 and Type 1 formats and indicates which function of a multifunction
device is to be accessed. For single-function devices, this value is not decoded. The
addresses of Type 1 configuration transaction include a 5-bit field designating the device
number that identifies the device on the target PCI bus that is to be accessed. In addition,
the bus number in Type 1 transactions specifies the PCI bus to which the transaction is
targeted.
TYPE 0 ACCESS TO PI7C7300D
The configuration space is accessed by a Type 0 configuration transaction on the primary
interface. The configuration space cannot be accessed from the secondary bus. The
PI7C7300D responds to a Type 0 configuration transaction by asserting P_DEVSEL#
when the following conditions are met during the address phase:
Function code is either 0 for configuration space of S1, or 1 for configuration space of S2
as PI7C7300D is a multi-function device.
PI7C7300D limits all configuration access to a single DWORD data transfer and returns
target-disconnect with the first data transfer if additional data phases are requested.
The bus command is a configuration read or configuration write transaction.
Lowest two address bits P_AD[1:0] must be 00b.
Signal P_IDSEL must be asserted.
Page 33 of 107
3-PORT PCI-TO-PCI BRIDGE
November 2005 - Revision 1.01
PI7C7300D