参数资料
型号: 78Q2123-DB
厂商: Maxim Integrated Products
文件页数: 22/38页
文件大小: 0K
描述: BOARD DEMO 78Q2123 78Q2133
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 1
系列: *
DS_21x3_001
78Q2123/78Q2133 Data Sheet
Rev. 1.6
29
4.6.3
100BASE-TX System Timing
System timing requirements for 100BASE-TX operation are listed in Table 24-2 of Clause 24 of IEEE
802.3.
Parameter
Condition
Nom
Unit
TX_EN Sampled to first bit of “J” on MDI
output
12
BT
First bit of “J” on MDI input to CRS assert
16
BT
First bit of “T” on MDI input to CRS
de-assert
23
BT
First bit of “J” on MDI input to COL assert
20
BT
First bit of “T” on MDI input to COL
de-assert
24
BT
TX_EN Sampled to CRS assert
RPTR = low
6
BT
TX_EN sampled to CRS de-assert
RPTR = low
6
BT
4.6.4
10BASE-T System Timing
Parameter
Condition
Min
Nom
Max
Unit
TX_EN (MII) to TD Delay
6
BT
RD to RXD at (MII) Delay
6
BT
Collision delay
9
BT
SQE test wait
1
s
SQE test duration
1
s
Jabber on-time*
20
150
ms
Jabber off-time*
250
750
ms
* Guarantee by design. The specifications in the following table are included for information only.
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