Altera PCI Compiler - Manual (Page 132)

3–58 User Guide Version 11.1 Altera Corporation
PCI Compiler October 2011
Target Mode Operation
Figure 3–11 shows that the local side transfers a full QWORD in clock cycle
6. In clock cycle 7, the pci_mt64 and pci_t64 functions drive the least
significant DWORD on ad[31..0]. The pci_mt64 and pci_t64
functions drive the correct parity value on the par signal in clock cycle 8.
1 The pci_mt64 and the pci_t64 functions always transfer
64-bit data on the local side. In a 32-bit single-cycle memory read
transaction, only one DWORD is transferred to the PCI master.
Figure 3–11. 32-Bit PCI and 64-Bit Local-Side Single-Cycle Memory Read Target Transaction
ad[31..0]
cben[3..0]
par
framen
req64n
irdyn
devseln
ack64n
trdyn
stopn
lt_framen
l_adro[31..0]
l_cmdo[3..0]
lt_ackn
l_adi[31..0]
clk
l_adi[63..32]
l_beno[3..0]
l_beno[7..4]
Adr
6
Adr-PAR
Z
Adr
6
l_ldat_ackn
l_hdat_ackn
BE0_L
Z
D0_L
D0_H
D0-L-PAR
lt_dxfrn
lt_tsr[11..0] 000 101 000 501
1 2 3 4 5 6 7 8 9 10
D0_L
lt_rdyn
BE0_H
BE0_L BE0_L
BE0_H