GR712RC-UM, Jun 2017, Version 2.9 114 www.cobham.com/gaisler
GR712RC
16.5.5 The transmission process
When the txen bit is set the GRSPW starts reading descriptors immediately. The number of bytes indi-
cated are read and transmitted. When a transmission has finished, status will be written to the first
field of the descriptor and a packet sent bit is set in the DMA control register. If an interrupt was
requested it will also be generated. Then a new descriptor is read and if enabled a new transmission
starts, otherwise the transmit enable bit is cleared and nothing will happen until it is enabled again.
31: 24 RESERVED
23: 0 Data length (DATALEN) - Length of data part of packet. If set to zero, no data will be sent. If both
data- and header-lengths are set to zero no packet will be sent.
Table 89. GRSPW transmit descriptor word 3(address offset 0xC)
31 0
DATAADDRESS
31: 0 Data address (DATAADDRESS) - Address from where data is read. Does not need to be word
aligned.
Table 88. GRSPW transmit descriptor word 2 (address offset 0x8)
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