STLC5466 datasheet(74/130 Pages) STMICROELECTRONICS

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STLC5466

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VII.3.2 - Bits written by the Tx DMAC only

VII.3.3 - Transmit Buffer

Each transmit buffer is defined by its transmit descriptor.

The maximum size of the buffer is 2048 words (1 word=2 bytes)

BOF

: Beginning Of Frame

BOF=1,the transmit buffer associated to this transmit descriptor contains the beginning of frame.

The DMA Controller will store automatically the current descriptor address in the Initialization

Block.

BOF=0, the DMA Controller will not store the current descriptor address in the Initialization

Block.

EOF

: End Of Frame

EOF = 1,the transmit buffer associated to this transmit descriptor contains the end of frame.

EOF = 0,the transmit buffer associated to this transmit descriptor does not contain the end of

frame

EOQ

: End Of Queue

EOQ = 1, the DMAC stops immediately its transmission, generates an interrupt (HDLC = 1 in IR)

and waits a command from the HTCR (HDLC Transmit Command Register).

EOQ = 0, the DMAC continues.

CRCC : CRC Corrupted

CRCC = 1,at the end of this frame the CRC will be corrupted by the Tx HDLC Controller.

PRI

: Priority Class 8 or 10

PRI = 1, if CSMA/CR is validated for this channel, the priority class is 8.

PRI = 0, if CSMA/CR is validated for this channel the priority class is 10.

(see Register CSMA)

CFT

: Frame correctly transmitted

CFT = 1, the Frame has been correctly transmitted.

CFT = 0, the Frame has not been correctly transmitted.

ABT

: Frame Transmitting Aborted

ABT = 1, the frame has been aborted by the microprocessor during the transmission.

ABT = 0, the microprocessor has not aborted the frame during the transmission.

UND

: Underrun

UND = 1, the transmit FIFO has not been fed correctly during the transmission.

UND = 0, the transmit FIFO has been fed correctly during the transmission.

TBA

First Word to Transmit

TBA + x;

NBT is odd: x = NBT - 1

NBT is even: x = NBT - 2

Last Word to Transmit

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