78Q2120 Teridian Semiconductor Corp. (TDK Semiconductor), 78Q2120 Datasheet - Page 24

• Manufacturer Part Number: 78Q2120
• Description: 10/100 Ethernet PHYS
• Manufacturer: Teridian Semiconductor Corp. (TDK Semiconductor)

100BASE-TX System Timing
System timing requirements for 100BASE-TX operation are listed in table 24-2 of Clause 24 of IEEE 802.3.
10BASE-T System Timing
* Guarantee by design. The specifications in the following table are included for information only.
PARAMETER
TX_EN Sampled to first bit of “J” on MDI
output
First bit of “J” on MDI input to CRS assert
First bit of “T” on MDI input to CRS
de-assert
First bit of “J” on MDI input to COL assert
First bit of “T” on MDI input to COL
de-assert
TX_EN Sampled to CRS assert
TX_EN sampled to CRS de-assert
PARAMETER
TX_EN (MII) to TD Delay
RD to RXDat (MII) Delay
Collision delay
SQE test wait
SQE test duration
Jabber on-time*
Jabber off-time*
RPTR = low
RPTR = low
CONDITION
CONDITION
24
MIN
250
20
Ethernet Transceiver
NOM
12
15
23
16
24
4
4
NOM
1
1
10/100BASE-TX
MAX
150
750
6
6
9
UNIT
BT
BT
BT
BT
BT
BT
BT
UNIT
ms
ms
BT
BT
BT
µs
µs