Hr875/876 Card - Mitsubishi Electric MELDAS C6 Maintenance Manual

2.5 HR875/876 Card

[Block diagram]
RTBUS
Connect to control
unit's back panel
PLD
[Explanation of functions]
The HR875/876 card functions as the 10Base-T Ethernet.
□ Bus conversion section (Base PCB ... HR875)
Memory SRAM
Add-on connector
□ Ethernet interface section (Add-on PCB ... HR876)
Ethernet Controller
Physical Layer Transceiver
Transformer
Modular jack
Add-on connector
Memory SRAM
EEPROM
Monitor LED
[Connector layout diagram]
HR875
HR876
RTBUS
[Explanation of LEDs]
RX : (Green) ON when receiving packet
TX : (Green) ON when transmitting packet
COL : (Green) ON when collision occurs
SPEED : (Green) ON during 100Base-T communication (always OFF)
LINK : (Green) ON when mutual communication is possible
FDPOL : (Green) ON during full-duplex communication
2. EXPLANATION OF MODULE FUNCTIONS
2.5 HR875/876 Card
Add-on
connector
S R A M
SRAM
HR875
PCIEXT/EXTPCI2
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Physical
Ethernet
layer
Controller
Transceiver
EEPROM
SRAM
HR876
ISP
II - 8
ETHERNET
Twisted
pair cable
Trans-
former
Modular
jack
RX
TX
ETHERNET