UM0842
Configuration
Doc ID 16542 Rev 4
11/50
For the two Ethernet PHYs (U5 and U6 in MII mode) to function correctly, it is necessary to
clock them using a 25-MHz clock. There are two ways to deliver the 25-MHz clock signal to
the devices.
5.2
Digital input / digital output connectors
The digital input and digital output connectors are used to extend the EVALSPEAR320PLC
board with the industrial input and output cards.
The input sensors (for example, proximity switches) of the controlled industrial process are
normally decoupled and connected by the current limiters based on the CLT and SCLT
devices of the microcontroller. The digital outputs, also electrically decoupled, are based on
high-side drivers which are used in industrial environments to switch industrial loads (valves,
relays, …) and process control. For both the inputs and outputs, we can use either serial
(SPI) or parallel (GPIO) IN/OUT cards.
The EVALSPEAR320PLC board is compatible with the following cards:
●
Digital input serial (CN3): STEVAL-IFP007V1
●
Digital output serial (CN4): STEVAL-IFP009V1
●
Digital input parallel (CN5): STEVAL-IFP004V1 and STEVAL-IFP008V1
●
Digital output parallel (CN6): STEVAL-IFP002V1, STEVAL-IFP001V1 and STEVAL-
IFP006V1
Figure 5.
EVALSPEAR320PLC board with digital input and digital output cards
MII1_MDC, MII1_MDIO used for both PHYs (U5, U6)
R93, R94, R27, R29 loaded
R95, R96 not loaded
MII2_MDC, MII2_MDIO used for both PHYs (U5, U6)
R95, R96, R27, R29 loaded
R93, R94 not loaded
Table 3.
SMI interface configuration (continued)
Function
Default configuration
Digital input
(current limiters)
EVALSPEAR320PLC
board
Controlled
process
Digital output
(high side drivers)
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