User Options

User options consist of connecting to the Strobe pin on the Logic Interface and connections to support DMA. 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 9. 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 be 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 9 Strobe Connection Options

The IP-Octal Serial is configured to support minimum Direct Memory Access (DMA) on Channels C and D. To use DMW, program the SCC for TxRDY or RxRDY on MPOc and/or MPOd. See Figure 10 below 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 10 DMA Shunt Assignments

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

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