參數(shù)資料
型號: NS32490D
廠商: National Semiconductor Corporation
英文描述: NIC Network Interface Controller(NIC網(wǎng)絡(luò)接口控制器)
中文描述: NIC網(wǎng)絡(luò)接口控制器(NIC網(wǎng)絡(luò)接口控制器)
文件頁數(shù): 47/56頁
文件大?。?/td> 689K
代理商: NS32490D
15.0 Switching Characteristics
(Continued)
Wait State Insertion
TL/F/8582–45
Symbol
Parameter
Min
Max
Units
ews
External Wait Setup to T3
v
Clock
(Note 1)
10
ns
ewr
External Wait Release Time
(Note 1)
15
ns
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.)
BSCK (MHz)
Y
of Wait States
Byte Transfer
Word Transfer
8
0
1
10
0
1
12
1
2
14
1
2
16
1
3
18
2
3
20
2
4
Table assumes 10 MHz network clock.
The number of allowable wait states in byte mode can be calculated using:
Y
W
(byte mode)
e
8 tnw
4.5 tbsck
b
1
Y
W
Y
W
(word mode)
e
e
Number of Wait States
e
Network Clock Period
e
BSCK Period
tnw
tbsck
The number of allowable wait states in word mode can be calculated using:
5 tnw
2 tbsck
b
1
47
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