# Beckhoff CCAT - emllCCAT

The parameters to the Real-time Ethernet Driver CCAT are setup-specific.
The function `CreateLinkParmsFromCmdLineCCAT()` in [`EcSelectLinkLayer.cpp`](_downloads/bf62c71a4a7e317930818b9da4a9815c/EcSelectLinkLayer.cpp) demonstrates how to initialize the Real-time Ethernet Driver instance.
Because the link status cannot be read quickly from a register of the adapter, it will not be automatically refreshed like by the other Real-time Ethernet Drivers.

### struct EC_T_LINK_PARMS_CCAT

### Public Members

### [EC_T_LINK_PARMS](emll_init.html.md#_CPPv415EC_T_LINK_PARMS) linkParms

Common link parameters. Signature must be set to EC_LINK_PARMS_SIGNATURE_CCAT. 

### [EC_T_CCAT_TYPE](#_CPPv414EC_T_CCAT_TYPE) eCcatType

CCAT connection type 

### [EC_T_UINT64](api.html.md#_CPPv411EC_T_UINT64) qwCcatBase

Physical address of register block, only for eCCAT_EIM 

### [EC_T_DWORD](api.html.md#_CPPv410EC_T_DWORD) dwCcatSize

Size of register block, only for eCCAT_EIM 

### [EC_T_DWORD](api.html.md#_CPPv410EC_T_DWORD) dwRxBufferCnt

Receive buffer count, only for eCCAT_EIM 

### [EC_T_DWORD](api.html.md#_CPPv410EC_T_DWORD) dwTxBufferCnt

Transmit buffer count, only for eCCAT_EIM 

### enum EC_T_CCAT_TYPE

*Values:*

### enumerator eCCAT_PCI

CCAT connected to PCI bus 

### enumerator eCCAT_EIM

CCAT connected via EIM. Used in ARM systems, no DMA 

## Supported PCI devices

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Beckhoff CCAT PCI specific definitions (VendorId, DeviceId)