FUNCTIONAL DESCRIPTION
STKP - Stick Parity:
Forces parity to logic 1 or logic 0 if parity is
enabled. See EPS, PEN, and figure 5.
EPS - Even Parity Select:
Selects even or odd parity if parity is enabled.
See STKP, PEN, and figure 5.
PEN - Parity Enable:
E n a b l e s p a r i t y g e n e r a t i o n o n t r a n s m i s s i o n a n d
v e r i f i c a t i o n o n r e c e p t i o n . S e e E P S , S T K P , a n d
figure 5.
+--------------+---------+
| STKP EPS PEN | Parity |
+--------------+---------+
| x x 0 | None |
| 0 0 1 | Odd |
| 0 1 1 | Even |
| 1 0 1 | Logic 1 |
| 1 1 1 | Logic 0 |
+--------------+---------+
Figure 5. 16450/16550 parity selections.
STB - Number of Stop Bits:
D e f i n e s t h e n u m b e r o f s t o p b i t s p e r c h a r a c t e r .
See WLSx and figure 6.
WLSx - Word Length Select:
D e f i n e s t h e n u m b e r o f d a t a b i t s p e r c h a r a c t e r .
See STB and figure 6.
+---------------+-------------+-----------+
| STB WLS1 WLS0 | Word length | Stop bits |
+---------------+-------------+-----------+
| 0 0 0 | 5 bits | 1 |
| 0 0 1 | 6 bits | 1 |
| 0 1 0 | 7 bits | 1 |
| 0 1 1 | 8 bits | 1 |
| 1 0 0 | 5 bits | 1½ |
| 1 0 1 | 6 bits | 2 |
| 1 1 0 | 7 bits | 2 |
| 1 1 1 | 8 bits | 2 |
+---------------+-------------+-----------+
Figure 6. Word length and stop bit selections.
