ADLINK PCIe-7360 - Manual (Page 57)

Operations 47
PCIe-7360
Timing of DO DMA in handshake mode is as shown.
Figure 3-17: DO Handshake Timing Diagram
DI DMA in Burst Handshake Mode
The burst handshake mode is a fast and reliable data transfer pro-
tocol. It has both advantage of handshake mode and continuous
mode.
In DI burst handshake mode, DI-REQ signal is active by external
device when it is ready to send DI data and sample clock. And
then DI-ACK signal is generated by PCIe-7360 when it is ready to
receive DI data from external device.
External device should start to send DI data after it detect DI-ACK
signal is active. DI data transfer between PCIe-7360 and external
device should be continued when both DI-REQ and DI-ACK are
active. When DI FIFO of PCIe-7360 becomes almost full, DI-ACK
signal is inactive. External device should stop to send DI data and
sample clock after it detects DI-ACK signal inactive. The operation
sequences are listed as follows:
DO D1 D2
DO -REQ
DO Data
Write data to external device
DO -ACK
t
2
t
3
t
2
• 40 ns
t
3
• 50 ns