SK_LED
CSR_WRITE_2(sc, SK_LED, SK_LED_GREEN_ON);
CSR_WRITE_2(sc, SK_LED, SK_LED_GREEN_OFF);
CSR_WRITE_2(sc, SK_LED, SK_LED_GREEN_ON);
CSR_WRITE_2(sc, SK_LED, SK_LED_GREEN_ON);
CSR_WRITE_2(sc, SK_LED, SK_LED_GREEN_OFF);
CSR_WRITE_2(sc, SK_LED, SK_LED_GREEN_OFF);
CSR_WRITE_2(sc, SK_LED, SK_LED_GREEN_ON);