5 commands, 6 interrupt request register (al event register), 7 write access – BECKHOFF EtherCAT IP Core for Altera FPGAs v3.0.10 User Manual
Page 108: 8 read access, Commands, Interrupt request register (al event register), Write access, Read access, Table 48: spi commands cmd0 and cmd1, Table 49: interrupt request register transmission
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