參數資料
型號: NS32490D
廠商: National Semiconductor Corporation
英文描述: NIC Network Interface Controller(NIC網絡接口控制器)
中文描述: NIC網絡接口控制器(NIC網絡接口控制器)
文件頁數: 53/56頁
文件大?。?/td> 689K
代理商: NS32490D
15.0 Switching Characteristics
(Continued)
Serial TimingDTransmit (Beginning of Frame)
TL/F/8582–90
Symbol
Parameter
Min
Max
Units
txch
Transmit Clock High Time
36
ns
txcl
Transmit Clock Low Time
36
ns
txcyc
Transmit Clock Cycle Time
80
120
ns
txcenh
Transmit Clock to Transmit Enable High
(Note 1)
48
ns
txcsdv
Transmit Clock to Serial Data Valid
67
ns
txcsdh
Serial Data Hold Time from
Transmit Clock High
10
ns
Note 1:
The NIC issues TXEN coincident with the first bit of preamble. The first bit of preamble is always a 1.
Serial TimingDTransmit (End of Frame, CD Heartbeat)
TL/F/8582–91
Symbol
Parameter
Min
Max
Units
tcdl
Transmit Clock to Data Low
55
ns
tcenl
Transmit Clock to TXEN Low
55
ns
tdcdh
TXEN Low to Start of Collision
Detect Heartbeat (Note 1)
0
64
txcyc
cycles
cdhw
Collision Detect Width
2
txcyc
cycles
Note 1:
If COL is not seen during the first 64 TX clock cycles following de-assertion of TXEN, the CDH bit in the TSR is set.
53
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