American Dynamics PMC-4U-CACI user manual Control

Parallel termination resistors are supplied on each differential pair along with a switch to allow the user to select which lines are terminated and where. In some systems it will make sense to terminate the lines in the cable and in others it will make sense to use the onboard terminations.

CONTROL	CORRESPONDING IO BITS
TERM0	IO_0..7
TERM1	IO_8..11
TERM2	IO_12..13
TERM3	IO_14..15

PMC4U_SW_IN

[0X14] PMC-4U User Switch Port read only

USER CONTROL SWITCH REGISTER

DATA BIT	DESCRIPTION
5	UB5
4	UB4
3	UB3
2	UB2
1	UB1
0	UB0
FIGURE 8	PMC-4U SWITCH READ BIT MAP

The Switch Read Port has the user bits. The user bits are connected to 6 switch positions. The switches allow custom configurations to be defined by the user and for the software to “know” how to configure the read/write capabilities of each IO line. Please note that the lower 6 bits of the switch are implemented [positions 7 & 8 are unused]. The silk-screen is marked with the ‘0’ and ‘1’ definitions.

Hardware and Software Design • Manufacturing Services

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