DP8390 NSC [National Semiconductor], DP8390 Datasheet - Page 47

• Manufacturer Part Number: DP8390
• Description: NIC Network Interface Controller
• Manufacturer: NSC [National Semiconductor]

15 0 Switching Characteristics
Note 1 The addition of wait states affects the count of deserialized bytes and is limited to a number of bus clock cycles depending on the bus clock and network
rates The allowable wait states are found in the table below (Assumes 10 Mbit sec data rate )
Table assumes 10 MHz network clock
BSCK (MHz)
Symbol
ews
ewr
10
12
14
16
18
20
8
Byte Transfer
0
0
1
1
1
2
2
External Wait Setup to T3
(Note 1)
External Wait Release Time
(Note 1)
of Wait States
Parameter
Word Transfer
1
1
2
2
3
3
4
(Continued)
Wait State Insertion
Clock
47
The number of allowable wait states in byte mode can be calculated using
tnw
tbsck
The number of allowable wait states in word mode can be calculated using
W
W
W
(byte mode)
(word mode)
Min
10
15
e
e
e
e
e
Number of Wait States
Network Clock Period
BSCK Period
4 5 tbsck
2 tbsck
5 tnw
8 tnw
b
b
1
1
Max
TL F 8582 – 45
Units
ns
ns