dp8390d National Semiconductor Corporation, dp8390d Datasheet - Page 53

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dp8390d

Manufacturer Part Number
dp8390d
Description
Nic Network Interface Controller
Manufacturer
National Semiconductor Corporation
Datasheet

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15 0 Switching Characteristics
Note 1 The NIC issues TXEN coincident with the first bit of preamble The first bit of preamble is always a 1
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
Symbol
txch
txcl
txcyc
txcenh
txcsdv
txcsdh
tcdl
tcenl
tdcdh
cdhw
Symbol
Transmit Clock High Time
Transmit Clock Low Time
Transmit Clock Cycle Time
Transmit Clock to Transmit Enable High
(Note 1)
Transmit Clock to Serial Data Valid
Serial Data Hold Time from
Transmit Clock High
Transmit Clock to Data Low
Transmit Clock to TXEN Low
TXEN Low to Start of Collision
Detect Heartbeat (Note 1)
Collision Detect Width
Serial Timing Transmit (End of Frame CD Heartbeat)
Parameter
Serial Timing Transmit (Beginning of Frame)
Parameter
(Continued)
53
Min
0
2
Min
36
36
80
10
Max
55
55
64
Max
120
48
67
TL F 8582 – 91
cycles
cycles
TL F 8582 – 90
Units
txcyc
txcyc
Units
ns
ns
ns
ns
ns
ns
ns
ns

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