Altera PCI Compiler - Manual (Page 172)

3–98 User Guide Version 11.1 Altera Corporation
PCI Compiler October 2011
Master Mode Operation
10 Because lm_lastn was asserted and a data phase was completed in the previous cycle, framen
and req64n are deasserted, while irdyn and trdyn are asserted. This action indicates that the
last data phase is completed on the PCI side on the rising edge of clock cycle 11.
On the local side, the function continues to assert
lm_ackn , informing the local side that the function
has registered data from the PCI side on the previous cycle and is ready to send the data to the local
side master interface. Because
lm_rdyn was asserted in the previous cycle and lm_ackn is
asserted in the current cycle, the function asserts lm_dxfrn . The assertion of the lm_dxfrn ,
l_ldat_ackn , and l_hdat_ackn signals indicate to the local side that another valid data is
available on the l_dato bus. The local side has now received two valid 64-bit data.
The function continues to assert lm_tsr[8] informing the local side that a successful data transfer
has occurred on the PCI bus during the previous clock cycle.
11 On the PCI side, irdyn , devseln , ack64n , and trdyn are deasserted, indicating that the current
transaction on the PCI side is completed. There will be no more PCI data phases.
On the local side, the function continues to assert lm_ackn , informing the local side that the function
has registered data from the PCI side on the previous cycle and is ready to send the data to the local-
side master interface. Because
lm_rdyn was asserted in the previous cycle and lm_ackn is
asserted in the current cycle, the function asserts lm_dxfrn . The assertion of the lm_dxfrn ,
l_ldat_ackn , and l_hdat_ackn signals indicate to the local side that data on the l_dato bus
is valid. The local side has now received three 64-bit words of data.
Because the local side has received all the data that was registered from the PCI side, the local side
can now deassert
lm_rdyn . Otherwise, if there is still some data that has not been transferred from
the PCI side to the local side, lm_rdyn must continue to be asserted.
The function continues to assert lm_tsr[8] informing the local side that a successful data transfer
has occurred on the PCI bus during the previous clock cycle.
12 The function deasserts lm_tsr [3] , informing the local side that the data transfer mode is
completed. Therefore, lm_ackn and lm_dxfrn are also deasserted.
Table 3–38. Zero-Wait State Burst Memory Read Master Transaction (Part 3 of 3)
Clock
Cycle
Event