
3–56 User Guide Version 11.1 Altera Corporation
PCI Compiler October 2011
Target Mode Operation
Figure 3–10 shows the same transaction as shown in Figure 3–8 with the
local side inserting a wait state. The local side deasserts lt_rdyn in clock
cycle 6. Deasserting lt_rdyn in clock cycle 6 suspends the local side data
transfer in clock cycle 7 by deasserting the lt_dxfrn signal. Because no
data is transferred in clock cycle 7 from the local side, the PCI MegaCore
function deasserts trdyn in clock cycle 8 thus inserting a PCI wait state.
Figure 3–10. Burst Memory Read Target Transaction with Local-Side Wait State
Note to Figure 3–10:
(1) This signal is not applicable to the pci_mt32 or pci_t32 MegaCore functions.
ad[31..0]
(1) ad[63..32]
cben[3..0]
(1) cben[7..4]
par
(1) par64
framen
(1) req64n
irdyn
devseln
(1) ack64n
trdyn
stopn
l_adro[31..0]
l_cmdo[3..0]
l_adi[31..0]
clk
(1) l_adi[63..32]
Adr
6
Adr-PAR
Z
Adr
6
Z
BE0_L
BE0_H
Z
D0_L
D0_H
D0_L
D0_H
D0-L-PAR
D0-H-PAR
Z
Z
D2_L
D2_H
D3_L
D3_H
D1_L
D1_H
D2_L
D2_H
D1-L-PAR
D1-H-PAR
D2-L-PAR
D2-H-PAR
234567 910 12811131
D1_L
D1_H
lt_framen
lt_rdyn
lt_ackn
lt_dxfrn
lt_tsr[11..0]
000 000381 781 381 781
BE1_L
BE2_L
BE1_H
BE2_H
BE0_H
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