PCI-MT32-O4-N2 Lattice, PCI-MT32-O4-N2 Datasheet - Page 124

• Manufacturer Part Number: PCI-MT32-O4-N2
• Description: FPGA - Field Programmable Gate Array PCI Master/Target 32B
• Manufacturer: Lattice

Specifications of PCI-MT32-O4-N2

• Factory Pack Quantity: 1

Lattice Semiconductor
IPUG18_09.2, November 2010
Table 2-49. Target Initiated Termination Summary
Disconnect With Data
A Disconnect With Data occurs after at least one DWORD or QWORD has been transferred. The difference
between a Disconnect With Data and a Disconnect Without Data depends on the state of
Interface requests a disconnect using the lt_disconnectn signal. This condition indicates if the bus transaction
is terminated before or after the completion of the current data phase. Once the current data phase is completed,
the bus transaction is terminated with a Disconnect With Data.
Data on a read transaction.
Below is a list of the reasons for the PCI IP core to perform a Disconnect With Data:
• Target is slow to complete subsequent data phase
• Target does not support requested burst mode
• Memory target does not understand addressing sequence
• Transfer crosses over target’s address boundary
Without Data
Termination
Target Abort
Disconnect
Disconnect
With Data
Retry
Type
De-asserted
De-asserted
Don’t Care
Asserted
lt_rdyn
lt_disconnectn
Don’t Care
Asserted
Asserted
Asserted
De-asserted
De-asserted
De-asserted
lt_abortn
Asserted
124
Some data is transferred. This includes the current DWORD or
QWORD. If the PCI master needs to transfer more data, the
transaction is re-initiated using the next address.
Some data is transferred but not the current DWORD or
QWORD. This occurs in a data phase other than the first phase.
The master may resume the transaction or not. If resumed, it
starts on the same address.
No data is transferred. This occurs during the first data phase.
Master may or may not try the same transaction.
Indicates a fatal error. Data is disregarded.
Figure 2-44
and
Table 2-50
Comments
Functional Description
PCI IP Core User’s Guide
lt_rdyn
show a Disconnect With
when the Local