ADLINK PCIe-7360 - Manual (Page 61)

Operations 51
PCIe-7360
Z
The PCIe-7360 can also export DO sampled clock to
external devices. The destination of the exported DO
sampled clock can be AFI6 or SMB CLK out connector.
Z
The phase shift function is available when exported
clock rate is from 20 to 100 MHz.
X
Define DO-REQ and DO-ACK signal (AFI0 - AFI7)
Z
For example: if configure AFI3 as DO-REQ and AFI4 as
DO-ACK, and then you must connect the handshake sig-
nal (DO-REQ and DO-ACK) of external device to the
AFI3 and AFI4.
X
Define DO starting mode configuration (NoWait or Wait-
TRIG)
Z If choose WaitTRIG, you can define start trigger source
to be software trigger or external trigger (DO-Start or
DO-TRIG) from AFI0 - AFI7.
X
Define DO data count
Step2: Execute DO DMA Write Command (burst handshake
mode)
X The DO data saved in the system memory is transferred to
DO FIFO directly and automatically by bus mastering DMA.
X
After DO data are ready, DO-REQ signal is asserted.
X
PCIe-7360 start to send DO data and DO sampled clock to
external device after DO-ACK signal is asserted.
X
If input buffer of external device has no much space for new
DO data, DO-ACK signal is inactive and PCIe-7360 is only
allowed to send 4 more data to the receiver.
X
If DO data are not ready (DO FIFO is empty), DO-REQ sig-
nal is inactive and PCIe-7360 stops to send DO data and
DO sample clock until DO data are ready again.
The operating architecture of DO DMA in burst handshake mode
is as shown.