82596CA Datasheet, PDF (65/76 Pages) Intel Corporation – HIGH-PERFORMANCE 32-BIT LOCAL AREA NETWORK COPROCESSOR

TRANSMIT RECEIVE CLOCK PARAMETERS (Continued)
Symbol
Parameter
20 MHz
Min
Max
INTERFRAME SPACING PARAMETERS
T71
Interframe Delay
EXTERNAL LOOPBACK-PIN PARAMETERS
T72
TXC Low to LPBK Low
T36
T73
TXC Low to LPBK High
T36
NOTES
1 Special MOS levels V_CIL e 0 9V and V_CIH e 3 0V
2 Manchester only
3 Manchester Needs 50% duty cycle
4 1 TTL load a 50 pF
5 1 TTL load a 100 pF
6 NRZ only
7 Abnormal end of transmission CTS expires before RTS
8 Normal end to transmission
9 Programmable value
T71 e N_IFS  T36
where N_IFS e the IFS configuration value
(if N_IFS is less than 12 then N_IFS is forced to 12)
10 Programmable value
T64 e (N_CDF  T36) a x  T36
(If the collision occurs after the preamble)
where
N_CDF e the collision detect filter configuration value
and
x e 12 13 14 or 15
11 T68 e 32  T36
12 Programmable value
T67 e (N_CSF  T36) a x  T36
where N_CSF e the Carrier Sense Filter configuration
value and
x e 12 13 14 or 15
13 To guarantee recognition on the next clock
82596CA
Notes
9
4
4
65