Answers Database
LogiCORE PCI: What is the functionality of latency timer?
Record #3762
Product Family: Documentation
Product Line: PCI Apps
Product Part: PCI Frequently Asked Questions
Problem Title:
LogiCORE PCI: What is the functionality of latency timer?
Problem Description:
Priority: Standard
Problem Description:
The current PCI specification requires a latency timer to
be implemented within the core which will insure bus
ownership for a minimum amount of time for each master.
Solution 1:
The latency timer is in units of PCI clocks. Its typical
values are 32 and 64 clocks (1 and 2 Microseconds). The
timer starts when FRAME# is asserted, and stops when count
expires OR FRAME# is deasserted.
The Master must vacate the bus when latency timer has
expired AND GNT# is deasserted.
End of Record #3762 - Last Modified: 10/01/99 14:42 |
