USB 2.0 test mode enable register.
TEST_SE0_NAK | Respond to any valid IN token with NAK. |
TEST_J | Force USB to continuous J state. |
TEST_K | Force USB to continuous K state. |
TEST_PKT | Transmit fixed test packet. |
FORCE_HS | Force USB to High-speed after reset. |
FORCE_FS | Force USB to Full-speed after reset. |