ADLINK PCIe-7350 - Manual (Page 57)

Function Block and Operation Theory 47
Step2: Execute DI DMA Read Command (burst handshaking
mode)
 PCIe-7350 will generate DI-ACK signal when it is ready to
receive DI data after DI-REQ signal is active.

External device starts to send DI data and DI sample clock
after DI-ACK signal is active.

PCIe-7350 starts to receive DI data and DI sample clock
from external device when DI-REQ and DI-ACK are all
active.

The DI data in the DI FIFO will be transferred into system
memory directly and automatically by bus mastering DMA.
The operation architecture of DI DMA in burst handshaking mode
is shown as below:
Figure 3-18: DI Burst Handshaking Mode Architecture
16 steps
phase shift
Ext. DI sampled clk
Ext. D
I C
LK
Mu
x
Bus Master DMA
8K FIFO Flip Flop
D[31:0]
I
AFI7
SMB CLK in
AFI[7:0]
DI sampled clk
Start Trigger
Mux
NoWait/
WaitTRIG
Software trigger DI-Start or DI-TRIG
PCIe-7350 Card
DI Data DI Data
External trigger in
External clock in
clk
enable
Software trigger out
DI-REQ
DI-ACK
DI-REQ
DI-ACK
DI-REQ
DI-ACK
DI
C
LK
Mu
x