78Q2120-64CG ETC [List of Unclassifed Manufacturers], 78Q2120-64CG Datasheet - Page 23

• Manufacturer Part Number: 78Q2120-64CG
• Description: 10/100BASE-TX Ethernet Transceiver
• Manufacturer: ETC [List of Unclassifed Manufacturers]

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 above table are not tested during production test. They 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
de-assert
First bit of “J” on MDI input to COL assert
First
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*
bit
bit
of
of
“T”
“T”
on
on
MDI
MDI
input
input
to
to
CRS
COL
CONDITION
CONDITION
RPTR = low
RPTR = low
23
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
78Q2120
UNIT
BT
BT
BT
BT
BT
BT
BT
UNIT
ms
ms
BT
BT
BT
s
s