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VSC8221 датащи(PDF) 53 Page - Microsemi Corporation

номер детали VSC8221
подробное описание детали  Single Port 10/100/1000BASE-T PHY with1.25 Gbps SerDes for SFPs/GBICs
PDF  138 Pages
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производитель  MICROSEMI [Microsemi Corporation]
домашняя страница  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

VSC8221 датащи(HTML) 53 Page - Microsemi Corporation

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VSC8221
Data Sheet
VMDS-10106 Revision 4.1
December 2006
53 of 56
56
18 HARDWARE CONFIGURATION USING CMODE PINS
Each of the four CMODE pins (CMODE[3:0]) are used to latch a four bit value at PHY reset. A total of sixteen CMODE
configuration bits are set at reset. Each CMODE bit represents the default value of a particular PHY register bit and therefore
sets a default PHY operating condition at startup.
18.1 Setting the CMODE Configuration Bits
The CMODE bits are set by connecting each CMODE pin to either VDD33A or VSS (ground) through an external 1% resistor.
The four bit value latched by the PHY on each CMODE pin depends upon the value of the resistor used to pull-up or pull-down
the CMODE pin. CMODE resistor values and connections are defined in the following table:
Table 25. CMODE Pull-up/Pull-down Resistor Values
CMODE
bit 3 value
CMODE
bit 2 value
CMODE
bit 1 value
CMODE
bit 0 value
CMODE
Resistor Value
Tied to
VDD33A or GND
00000
GND
0001
2.26k
GND
0010
4.02k
GND
0011
5.90k
GND
010
0
8.25k
GND
0101
12.1k
GND
0110
16.9k
GND
0111
22.6k
GND
10000
VDD33A
1001
2.26k
VDD33A
1010
4.02k
VDD33A
1011
5.90k
VDD33A
1100
8.25k
VDD33A
1101
12.1k
VDD33A
1110
16.9k
VDD33A
1111
22.6k
VDD33A



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