參數(shù)資料
型號(hào)： ICSXXXXY
英文描述： Auto-Negotiation Advertisement Register (register 4 [0x04])
中文描述： 自動(dòng)談判廣告登記（注冊(cè)4 [0x04]）
文件頁數(shù)： 46/66頁
文件大小： 1725K
代理商： ICSXXXXY
46
ICS1890
Phy Address 4 - Receive Data LED
At power-up and reset, this pin is sampled for a logic high or
zero. If a logic one is detected, a value of 16 is set in the
configuration register.
P4RD
The
ICS1890
sets this bit to the appropriate value to turn on
the LED when receive data is detected. This signal is stretched
ensure that a single packet will be seen. If the packet stream
is continuous, the LED will appear permanently on.
Phy Address 3 - Transmit Data LED
At power-up and reset, this pin is sampled for a logic high or
zero. If a logic one is detected, a value of 8 is set in the
configuration register.
P3TD
The
ICS1890
sets this bit to the appropriate value to turn on
the LED when transmit data is detected. This signal is stretched
to ensure that a single packet will be seen. If the packet stream
is continuous, the LED will appear permanently on.
Phy Address 2 - Link Integrity LED
At power-up and reset, this pin is sampled for a logic high or
zero. If a logic one is detected, a value of 4 is set in the
configuration register.
P2LI
The
ICS1890
sets this bit to the appropriate value to turn on
the LED when the Link Integrity status is OK.
Phy Address 1 - Collision LED
At power-up and reset, this pin is sampled for a logic high or
zero. If a logic one is detected, a value of 2 is set in the
configuration register.
P1CL
The
ICS1890
sets this bit to the appropriate value to turn on
the LED when a collision is detected. This signal is stretched
to ensure that a single collision will be seen. If the collisions
are continuous, the LED will appear permanently on.
Phy Address 0 - Activity LED
At power-up and reset, this pin is sampled for a logic high or
zero. If a logic one is detected, a value of 1 is set in the
configuration register.
P0AC
The
ICS1890
sets this bit to the appropriate value to turn on
the LED when either transmit or receive activity is detected.
This signal is stretched to ensure that a single activity event
will be seen. If the activity is continuous, the LED will appear
permanently on.
Power Supply
These 7 VDD and 8 VSS pins supply power to the
ICS1890
device.
ICS1890 Power Supply Isolation and Filtering
It is important to properly isolate the
ICS1890
10/100Base-
TX Physical Layer Device from noise sources in a system
design. There are two key areas to consider, isolation from
digital noise and noise coupling between the transmitter and
receiver.
Filtering for the
ICS1890
is accomplished by separating the
power supply into three domains: digital, transmit, and receive.
All supply pins on the device fall into one of these three
categories as shown in the table below.
In the above table, each supply pin is followed directly by its
ground pin. Each supply pair should be bypassed with a 0.1μF
capacitor located as close to the device as possible.
The PCB board may have separate power and ground planes
for the
ICS1890
. The power planes could be split into three
domains following the pin isolation. A single, uniform plane
should be used for ground. Power plane placement is illustrated
in the figure below.
Point-to-point trace routing for power connections may be
used instead of actual power planes if required by printed
circuit board constraints.
Both the Receive and Transmit Domains should be connected
to the Digital Domain or main supply through a ferrite bead or
inductor, with a value of .1μH to 1μH. The best filter configuration
is a pi filter composed of a .1μH capacitor, .1μH ferrite bead,
and a .1μH capacitor at the device pin.
Reserved & N/C Pins
Four pins are labeled Reserved or N/C. These pins should
be left unconnected. Connecting these pins to ground or
power may prevent the device from operating properly
Digital Domain
Transmit Domain
Receive Domain
16 VDD
18 VDD
17 VSS
25 VDD
29 VSS
41 VDD 8 VDD
40 VSS 7VSS
54 VDD
51 VSS
57 VDD
63 VSS
56 VDD
55 VSS
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