am79c940 Advanced Micro Devices, am79c940 Datasheet - Page 93

• Manufacturer Part Number: am79c940
• Description: Media Access Controller For Ethernet Mace
• Manufacturer: Advanced Micro Devices

AC CHARACTERISTICS (continued)
AUI Timing
DAI Port Timing
100
101
102
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
79
80
70
72
80
95
96
97
98
99
No.
Parameter
Symbol
tDOTD
tDOTR
tDOTF
tDOETM
tDOETD
tPWRDI
tPWODI
tPWMDI
tPWKDI
tPWRCI
tPWOCI
tPWMCI
tPWKCI
tSQED
tSQEL
tCLSHI
tTXH
tTXEND
tTXDD
tXH
tDOTF
tTXDTR
tTXDTF
tTXDTM
tTXENETD
tFRXDD
tLRXDD
tCRSCLSD
XTAL1 (externally driven) to
DO output
DO rise time (10% to 90%)
DO fall time (10% to 90%)
DO rise and fall mismatch
DO End of Transmit Delimiter
DI pulse width to reject
DI pulse width to turn on
internal DI carrier sense
DI pulse width to maintain
internal DI carrier sense on
DI pulse width to turn internal
DI carier sense off
CI pulse width to reject
CI pulse width to turn on
internal SQE sense
CI pulse width to maintain
internal SQE sense on
CI pulse width to turn internal
SQE sense off
CI SQE Test delay from
O inactive
CI SQE Test length
CLSN high time
TXEN or DO hold time from
CLSN
STDCLK delay to TXEN
STDCLK delay to TXDAT
change
TXEN or TXDAT hold time
from CLSN
Mismatch in STDCLK to TXEN
and TXDAT change
TXDAT rise time
TXDAT fall time
TXDAT rise and fall mismatch
TXEN End of Transmit Delimiter
First RXDAT delay to RXCRS
Last RXDAT delay to RXCRS
RXCRS delay to CLSN
(TXEN = 0)
Parameter Description
Am79C940
|input| > |VASQ|
|input| > |VASQ|
|input| > |VASQ|
|input| > |VASQ|
|input| > |VASQ|
|input| > |VASQ|
|input| > |VASQ|
|input| > |VASQ|
|input| > |VASQ|
|input| > |VASQ|
|input| > |VASQ|
CL = 50 pF
CL = 50 pF
See Note 1
See Note 1
See Note 1
Test Conditions
Min (ns)
tSTDC+30
32*tSTDC
32*tSTDC
200
200
160
250
2.5
2.5
45
45
26
26
Max (ns)
96*tSTDC
96*tSTDC
AMD
100
375
136
350
100
120
100
5.0
5.0
15
10
90
70
70
15
1
5
5
1
93