參數(shù)資料
型號(hào)： DP83848HSQ/NOPB
廠商： National Semiconductor
文件頁(yè)數(shù)： 36/82頁(yè)
文件大小： 0K
描述： IC TXRX ETHERNET PHYTER 40-LLP
產(chǎn)品培訓(xùn)模塊： PHYTER® Family
標(biāo)準(zhǔn)包裝： 1
類型： 收發(fā)器
驅(qū)動(dòng)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： 40-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 40-LLP-EP（6x6）
包裝： 剪切帶 (CT)
配用： DP83848H-MAU-EK-ND - BOARD EVALUATION DP83848H
其它名稱： *DP83848HSQ/NOPB
DP83848HSQCT
www.national.com
40
D
P
83
84
8H
7.1.1 Basic Mode Control Register (BMCR)
Table 12. Basic Mode Control Register (BMCR), address 0x00
Bit
Bit Name
Default
Description
15
Reset
0, RW/SC
Reset:
1 = Initiate software Reset / Reset in Process.
0 = Normal operation.
This bit, which is self-clearing, returns a value of one until the reset
process is complete. The configuration is re-strapped.
14
Loopback
0, RW
Loopback:
1 = Loopback enabled.
0 = Normal operation.
The loopback function enables MII transmit data to be routed to the MII
receive data path.
Setting this bit may cause the descrambler to lose synchronization and
produce a 500
s “dead time” before any valid data will appear at the
MII receive outputs.
13
Speed Selection
RW
Speed Select:
When auto-negotiation is disabled writing to this bit allows the port
speed to be selected.
1 = 100 Mb/s.
0 = 10 Mb/s.
12
Auto-Negotiation
Enable
RW
Auto-Negotiation Enable:
Strap controls initial value at reset.
1 = Auto-Negotiation Enabled - bits 8 and 13 of this register are ig-
nored when this bit is set.
0 = Auto-Negotiation Disabled - bits 8 and 13 determine the port speed
and duplex mode.
11
Power Down
0, RW
Power Down:
1 = Power down.
0 = Normal operation.
Setting this bit powers down the PHY. Only the register block is en-
abled during a power down condition.
10
Isolate
0, RW
Isolate:
1 = Isolates the Port from the MII with the exception of the serial man-
agement.
0 = Normal operation.
9
Restart Auto-
Negotiation
0, RW/SC
Restart Auto-Negotiation:
1 = Restart Auto-Negotiation. Re-initiates the Auto-Negotiation pro-
cess. If Auto-Negotiation is disabled (bit 12 = 0), this bit is ignored. This
bit is self-clearing and will return a value of 1 until Auto-Negotiation is
initiated, whereupon it will self-clear. Operation of the Auto-Negotiation
process is not affected by the management entity clearing this bit.
0 = Normal operation.
8
Duplex Mode
Strap, RW
Duplex Mode:
When auto-negotiation is disabled writing to this bit allows the port Du-
plex capability to be selected.
1 = Full Duplex operation.
0 = Half Duplex operation.
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