Datasheet

DS_21x3_001 78Q2123/78Q2133 Data Sheet
4.5 DigitalTiming Characteristics
4.5.1 RST Characteristics
Figure 1: RST Pulse Duration
Parameter Symbol Conditions Min Nom Max Unit
RST Pulse Assertion Treset
VCC = 3.3V and
oscillator stabilized
30
Oscillator
Clock
Cycles
4.5.2 MII Transmit Interface
Characteristics Symbol Conditions Min Nom Max Unit
Setup Time: TX_CLK to
TXD[3:0], TX_EN, TX_ER
TX
SU
15 ns
Hold Time: TX_CLK to
TXD[3:0], TX_EN, TX_ER
TX
HD
0 ns
CKIN-to-TX_CLK Delay
T
CKIN
0 40 ns
TX_CLK Duty-Cycle 40 60 %
Figure 2: Transmit Inputs to the 78Q2123/78Q2133
VCC
Oscillator
RST
T
reset
25