SEND_CTRL
write_csr(dd, SEND_CTRL, 0);
write_csr(dd, SEND_CTRL, 0);
write_csr(dd, SEND_CTRL, sendctrl | SEND_CTRL_CM_RESET_SMASK);
sendctrl = read_csr(dd, SEND_CTRL);
reg = read_csr(dd, SEND_CTRL);
write_csr(dd, SEND_CTRL, reg);
(void)read_csr(dd, SEND_CTRL); /* flush write */