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| 型号： | 1893YI-10 |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 网络接口 |
| 英文描述： | DATACOM, INTERFACE CIRCUIT, PQFP64 |
| 封装： | 10 X 10 MM, TQFP-64 |
| 文件页数： | 9/152页 |
| 文件大小： | 943K |
| 代理商： | 1893YI-10 |
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ICS1893 Rev C 6/6/00
June, 2000
106
Chapter 9
Pin Diagram, Listings, and Descriptions
ICS1893 Data Sheet - Release
Copyright 2000, Integrated Circuit Systems, Inc.
All rights reserved.
9.3.2
Multi-Function (Multiplexed) Pins: PHY Address and LED Pins
Table 9-3 lists the pins for the multi-function group of pins (that is, the multiplexed PHY Address / LED
pins).
Note:
1.
During either a power-on reset or a hardware reset, each multi-function configuration pin is an input
that is sampled when the ICS1893 exits the reset state. After sampling is complete, these pins are
output pins that can drive status LEDs.
2.
A software reset does not affect the state of a multi-function configuration pin. During a software reset,
all multi-function configuration pins are outputs.
3.
Each multi-function configuration pin must be pulled either up or down with a resistor to establish the
address of the ICS1893. LEDs placed in series with these resistors provide a designated status
indicator.
Caution:
All pins listed in Table 9-3 must not float.
4.
As outputs, the asserted state of a multi-function configuration pin is the inverse of the sense sampled
during reset. This inversion provides a signal that can illuminate an LED during an asserted state. For
example, if a multi-function configuration pin is pulled down to ground through an LED and a
current-limiting resistor, then the sampled sense of the input is low. To illuminate an LED for the
asserted state requires the output to be high.
Note:
Each of these pins monitor the data link by providing signals that directly drive LEDs.
Table 9-3.
PHY Address and LED Pins
Pin
Name
Pin
Number
Pin
Type
Pin Description
P0AC
55
Input or
Output
PHY (Address Bit) 0 / Activity LED.
For more information on this pin, see Section 6.8, “Status Interface”.
This multi-function configuration pin is:
– An input pin during either a power-on reset or a hardware reset. In
this case, this pin configures the ICS1893 when it is in either
hardware mode or software mode.
– An output pin following reset. In this case, this pin provides link status
of the ICS1893.
As an input pin:
This pin establishes the address for the ICS1893. When the signal on
this pin is logic:
– Low, that address bit is set to logic zero.
– High, that address bit is set to logic one.
As an output pin:
When the signal on this pin is:
– De-asserted, this state indicates the ICS1893 does not have a link.
– Asserted, this state indicates the ICS1893 has a valid link.
Caution:
This pin must not float. (See the notes at Section 9.3.2,
“Multi-Function (Multiplexed) Pins: PHY Address and LED
Pins”.)
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