The following attributes are available for all devices supporting a HFCE interface

Speed

The KMXF_HFCE_SPEED attribute holds the speed for each RX and TX channels, in Bps.

The supported range is:

Module	Range (bps)	Default (bps)	Note
MXF_MODULE_HFCE	100000 - 1000000	400000	Frequency = 16000000 / n with 15 ≤ n ≤ 159

TX Interframe Time Fill

The KMXF_HFCE_TX_INTERFRAME_TIME_FILL attribute holds the inter-frame time fill option.

The supported values are:

Constant	Value
VMXF_HFCE_TX_INTERFRAME_TIME_FILL_NONE	No idle pattern will be sent between transmission (idle time). Allows other stations on the bus to transmit. (default)
VMXF_HFCE_TX_INTERFRAME_TIME_FILL_IDLE_PATTERN	Idle pattern will be sent between transmission. No other stations on the bus are allowed to transmit.

Loopback Mode

The KMXF_HFCE_TX_RX_TEST_LB attribute holds the TX-to-RX loopback state for the receiver channel. When the loopback mode is enabled, the received data comes from the corresponding internal transmitter instead of the default configuration where the received data come from the RX line circuit. This feature is intended for a demo application or for testing purposes. When enabled, the module's first RX channel receives data transmitted on the first TX channel; the second RX channel receives data from the second TX channel, and so on.

The supported values are:

Constant	Value
VMXF_ENABLE	Enable loopback
VMXF_DISABLE	Disable loopback (default)

RX FIFO Aging Timeout

The KMXF_HFCE_RX_FIFO_AGING attribute defines the FIFO aging timeout value for a receiver channel. It defines the longest delay that a received word can wait in the hardware FIFO before a receive interrupt is generated. The attribute value resolution is based on the timebase resolution. A RX FIFO Aging Timeout value of 0 disables the aging timeout.

The supported range is:

Module	Range (microsecond)	Default (microsecond)	Note
MXF_MODULE_HFCE	0 - 16320	8192	Value is rounded down to step of 64 microseconds

Note: MX Foundation takes care of initializing this attribute using the optimal value. It is not recommended to change this attribute unless told to do so by a MAX Technologies' support engineer.

RX FIFO Almost Full Threshold

The KMXF_HFCE_RX_FIFO_AF attribute holds the almost full threshold for a receiver channel. This attribute value determines the number of received words that must be accumulated in the receive hardware FIFO before an interrupt is generated.

The supported range is:

Module	Range (16-bit word)	Default (16-bit word)
MXF_MODULE_HFCE	1 - 127	16

Note: MX Foundation takes care of initializing this attribute using the optimal value. It is not recommended to change this attribute unless told to do so by a MAX Technologies' support engineer.

TX FIFO Almost Full Threshold

The KMXF_HFCE_TX_FIFO_AF attribute holds the almost full threshold for a transmitter channel. The attribute value determines the maximum number of transmit words that are queued in the transmit hardware FIFO. The transmit interrupt will be cleared automatically once this threshold is reached.

The supported range is:

Module	Range (16-bit word)	Default (16-bit word)
MXF_MODULE_HFCE	2 - 255	48

Note: MX Foundation takes care of initializing this attribute using the optimal value. It is not recommended to change this attribute unless told to do so by a MAX Technologies' support engineer.

TX FIFO Almost Empty Threshold

The KMXF_HFCE_TX_FIFO_AE attribute holds the almost empty threshold for a transmitter channel. The attribute value determines when the transmit interrupt will be generated. The transmit interrupt will be generated whenever the number of word remaining in the transmit hardware FIFO is less than or equal to the value specified through this attribute. The software embedded process, will then be able to react and fill in the transmit FIFO.

The supported range is:

Module	Range (16-bit word)	Default (16-bit word)
MXF_MODULE_HFCE	1 - 254	32

Note: MX Foundation takes care of initializing this attribute using the optimal value. It is not recommended to change this attribute unless told to do so by a MAX Technologies' support engineer.

RX Time tag Enable

The KMXF_HFCE_MODULE_RX_TIMETAG_ENABLE attribute defines the RX time tag enable state. When the time tag reception is disabled, the timeTag field of MXF_HFCE_DATAREC will always be 0. Disabling the time tag can result in a small gain in performance, because less data are transferred between the module and the reception buffer.

The supported values are:

Constant	Value
VMXF_ENABLE	Enable time tag reception (default)
VMXF_DISABLE	Disable time tag reception