參數(shù)資料
型號： DP83848YB/NOPB
廠商： National Semiconductor
文件頁數(shù)： 17/86頁
文件大?。?/td> 0K
描述： IC TXRX ETHERNET PHYTERA 48-LQFP
標(biāo)準包裝： 250
類型： 收發(fā)器
驅(qū)動器/接收器數(shù)： 1/1
規(guī)程： 以太網(wǎng)
電源電壓： 3 V ~ 3.6 V
安裝類型： 表面貼裝
封裝/外殼： 48-LQFP 裸露焊盤
供應(yīng)商設(shè)備封裝： 48-LQFP 裸露焊盤（7x7）
包裝： 帶卷 (TR)
其它名稱： DP83848YBTR
23
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DP
83
84
8
Y
B
3.4.3 Serial Management Preamble Suppression
The DP83848YB supports a Preamble Suppression mode
as indicated by a one in bit 6 of the Basic Mode Status
Register (BMSR, address 01h.) If the station management
entity (i.e. MAC or other management controller) deter-
mines that all PHYs in the system support Preamble Sup-
pression by returning a one in this bit, then the station
management entity need not generate preamble for each
management transaction.
The DP83848YB requires a single initialization sequence
of 32 bits of preamble following hardware/software reset.
This requirement is generally met by the mandatory pull-up
resistor on MDIO in conjunction with a continuous MDC, or
the management access made to determine whether Pre-
amble Suppression is supported.
While the DP83848YB requires an initial preamble
sequence of 32 bits for management initialization, it does
not require a full 32-bit sequence between each subse-
quent transaction. A minimum of one idle bit between man-
agement transactions is required as specified in the IEEE
802.3u specification.
Table 5. Typical MDIO Frame Format
MII Management
Serial Protocol
<idle><start><op code><device addr><reg addr><turnaround><data><idle>
Read Operation
<idle><01><10><AAAAA><RRRRR><Z0><xxxx xxxx xxxx xxxx><idle>
Write Operation
<idle><01><01><AAAAA><RRRRR><10><xxxx xxxx xxxx xxxx><idle>
Figure 4. Typical MDC/MDIO Read Operation
Figure 5. Typical MDC/MDIO Write Operation
MDC
MDIO
00 0
11
110 0 00 000
(STA)
Idle
Start
Opcode
(Read)
PHY Address
(PHYAD = 0Ch)
Register Address
(00h = BMCR)
TA
Register Data
Z
MDIO
(PHY)
Z
0 0 0 1 1 0 0 0 1 0 0 0000 0 0 Z
Idle
Z
MDC
MDIO
00
0
11
11 0 0 0 0 000
(STA)
Idle
Start Opcode
(Write)
PHY Address
(PHYAD = 0Ch)
Register Address
(00h = BMCR)
TA
Register Data
Z
0 0 0
0 00
0 0 0 0 0 000 Z
Idle
10 0
0
Z
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參數(shù)描述
DP83848YBX/NOPB 功能描述:以太網(wǎng) IC RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray
DP83849C 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PHYTER? DUAL Commercial Temperature Dual Port 10/100 Mb/s Ethernet Physical Layer Transceiver
DP83849C_08 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PHYTER? DUAL Commercial Temperature Dual Port 10/100 Mb/s Ethernet Physical Layer Transceiver
DP83849CVS 功能描述:以太網(wǎng) IC RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray
DP83849CVS 制造商:Texas Instruments 功能描述:TRANSCEIVER, ENET PHYTER, DUAL, 80TQFP 制造商:Texas Instruments 功能描述:TRANSCEIVER, ENET PHYTER, DUAL, 80TQFP; Data Rate:100Mbps; Ethernet Type:IEEE 802.3u; Supply Voltage Min:3V; Supply Voltage Max:3.6V; Digital IC Case Style:TQFP; No. of Pins:80; Interface Type:MII, RMII, Serial; Operating Temperature;RoHS Compliant: Yes
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