PI7C8152BMAE Pericom Semiconductor, PI7C8152BMAE Datasheet - Page 32

• Manufacturer Part Number: PI7C8152BMAE
• Description: IC PCI-PCI BRIDGE 2PORT 160-MQFP
• Manufacturer: Pericom Semiconductor

Specifications of PI7C8152BMAE

• Applications: *
• Interface: *
• Voltage - Supply: *
• Package / Case: 160-MQFP, 160-PQFP
• Mounting Type: Surface Mount
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 3 V to 3.6 V
• Supply Current (max): 246 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.9.2
3.9.3
!
If PI7C8152x is delivering posted write data when it terminates the transaction because the
master latency timer expires, it initiates another transaction to deliver the remaining write
data. The address of the transaction is updated to reflect the address of the current DWORD
to be delivered.
If PI7C8152x is pre-fetching read data when it terminates the transaction because the
master latency timer expires, it does not repeat the transaction to obtain more data.
MASTER ABORT RECEIVED BY PI7C8152x
If the initiator initiates a transaction on the target bus and does not detect DEVSEL_L
returned by the target within five clock cycles of the assertion of FRAME_L, PI7C8152x
terminates the transaction with a master abort. This sets the received-master-abort bit in the
status register corresponding to the target bus.
For delayed read and write transactions, PI7C8152x is able to reflect the master abort
condition back to the initiator. When PI7C8152x detects a master abort in response to a
delayed transaction, and when the initiator repeats the transaction, PI7C8152x does not
respond to the transaction with DEVSEL_L, which induces the master abort condition back
to the initiator. The transaction is then removed from the delayed transaction queue. When
a master abort is received in response to a posted write transaction, PI7C8152x discards the
posted write data and makes no more attempt to deliver the data. PI7C8152x sets the
received-master-abort bit in the status register when the master abort is received on the
primary bus, or it sets the received master abort bit in the secondary status register when
the master abort is received on the secondary interface. When master abort is detected in
posted write transaction with both master-abort-mode bit (bit 5 of bridge control register)
and the SERR_L enable bit (bit 8 of command register for secondary bus) are set,
PI7C8152x asserts P_SERR_L if the master-abort-on-posted-write is not set. The master-
abort-on-posted-write bit is bit 4 of the P_SERR_L event disable register (offset 64h).
Note: When PI7C8152x performs a Type 1 to special cycle conversion, a master abort is
the expected termination for the special cycle on the target bus. In this case, the master
abort received bit is not set, and the Type 1 configuration transaction is disconnected after
the first data phase.
TARGET TERMINATION RECEIVED BY PI7C8152x
When PI7C8152x initiates a transaction on the target bus and the target responds with
DEVSEL_L, the target can end the transaction with one of the following types
of termination:
!
!
!
!
The target terminates the transaction with a retry, disconnect, or target abort.
Normal termination (upon de-assertion of FRAME_L)
Target retry
Target disconnect
Target abort
Page 32 of 90
2-PORT PCI-TO-PCI BRIDGE
October 16, 2003 – Revision 1.11
ADVANCE INFORMATION
PI7C8152A & PI7C8152B