16
User Options
User options consist of connecting to the Strobe pin on the Logic Interface and
connections to support DMA.
The location of the shunt groups is shown near the end of this Manual in Figure 10.
The Strobe pin on the Logic Interface (pin 46) is provided for secondary clock input or
output. This pin may be driven by the Channel a Multi-Purpose Output from the SCC, or
it may be connected to provide for the external input the to Counter/Timer. These
options are shown below in Figure 8. Note that in most cases some corresponding
programming of SCC modes is required. The SCC may be programmed to drive the
connected pin for other functions that those listed in the Figure below. The IndustryPack
Logic Interface Specification restricts the Strobe pin to clock functions, however. Only
those functions listed below should programmed.
Shunt E1
I/O
SCC Pin
Function
1-2
Output MPOa
Counter/Timer
output
1-2
Output
MPOa
Transmit Clock (1X or 16X)
1-2
Output
MPOa
Receive Clock (1X or 16X)
2–3
Input
MPI1a
General Purpose Input
2–3
Input
MPI1a
Counter/Timer External Input
OUT
none
none
Strobe Pin floating
default
Figure 8 Strobe Connection Options
The IP-OCTAL-422 is configured to support minimum Direct Memory Access (DMA) on
Channels C and D. To use DMA, program the SCC for TxRDY or RxRDY on MPOc
and/or MPOd. See Figure 9 below for DMA Shunt Assignments.
Shunt
SCC Pin
Logic Pin
Function
E2 IN
MPOc
DMAReq0
TxRDY or RxRDY
E3 IN
MPOd
DMAReq1
TxRDY or RxRDY
E2,E3 OUT
--
--
No DMA
default
Figure 9 DMA Shunt Assignments
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