stream x configuration register
| EN | Stream enable / flag stream ready when read low | 
| DMEIE | Direct mode error interrupt enable | 
| TEIE | Transfer error interrupt enable | 
| HTIE | Half transfer interrupt enable | 
| TCIE | Transfer complete interrupt enable | 
| PFCTRL | Peripheral flow controller | 
| DIR | Data transfer direction | 
| CIRC | Circular mode | 
| PINC | Peripheral increment mode | 
| MINC | Memory increment mode | 
| PSIZE | Peripheral data size | 
| MSIZE | Memory data size | 
| PINCOS | Peripheral increment offset size | 
| PL | Priority level | 
| DBM | Double buffer mode | 
| CT | Current target (only in double buffer mode) | 
| ACK | ACK | 
| PBURST | Peripheral burst transfer configuration | 
| MBURST | Memory burst transfer configuration | 
| CHSEL | Channel selection |