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Table 4-1 HP 16550A Resource Division
Group Pair Resource Operation Resource Pair Links Group Link
Group
1
Pair 1 Off, On, Negate a Combine
resources
within
pairs
using
AND,
NAND, OR,
XNOR
Off, On, Negate b
Pair 2 Off, On, Negate c
Off, In Range, Out of Range Range 1
Pair 3 Off, On, Negate d Combine
pairs
within
groups or
in group 1
and group
2 using
AND or OR
Off, On, Negate Edge 1
Pair 4 Off, On, Negate e
Off, <, > Timer 1
Group
2
Pair 1 Off, On, Negate f
Combine
resources
within
pairs
using
AND,
NAND, OR,
NOR,
XNOR
Off, On, Negate g
Pair 2 Off, On, Negate h
Off, In Range, Out of Range Range 2
Pair 3 Off, On, Negate i
Off, On, Negate Edge 2
Pair 4 Off, On, Negate j
Off, <, > Timer 2
So, the following combinations are valid combinations for the state
analyzer, if timers are on:
(a+b) • (In_Range2 + Timer2 > 400 ns)
(c • Out_Range1) + (f xor g)
The following combinations are not valid, because resources cross pair
boundaries:
(a + c)
(d + Timer1 < 400 ns)
The first example shows that a and c cannot be combined at the first
level. You can get around this, however, by combining them at the
second level.
Concepts
4–8