CHAMP-AV8 (VPX6-462) H
ARDWARE
U
SER
’
S
M
ANUAL
C
URTISS
-W
RIGHT
1-18
P
ROPRIETARY
826448 V
ERSION
5 M
ARCH
2015
Figure 1.8: CHAMP-AV8 Serial Port Implementation
Access to the two dual-mode EIA-232/422 transceivers are multiplexed by the FPGA between
DIO[16] and UART A0 (also between DIO[17] and UART B0). This allows a DIO port to take
control of a EIA-422 differential pair, thus forming a DDIO (Differential DIO) port. Figure 1.9,
“CHAMP-AV8 Serial Port Detail,” on page 1-19 illustrates how the control registers are used to
control switching between the DIO registers, UART ports, and the EIA-232/422 dual-mode
transceiver.
Node
B
Intel®
PCH
Front Panel
Connector
Node
A
Intel®
PCH
LPC_A
A0/A1
RS-232/422
Transceiver
ISL 3333
1 RS 422 CH or
2 RS 232 CH
TX
TX
RX
RX
B0/B1
RS-232/422
Transceiver
ISL 3333
TX
TX
RX
RX
Backplane Connector
CF- FPGA
SEL
SEL
REG
UART
A1
UART
A0
UART
B1
UART
B0
REG
LPC_B
UART
A2
UART
B2
UART
A3
RS- 422
XCVR
RS- 422
XCVR
IPMI BMC
1 RS 422 CH or
2 RS 232 CH
TX
p/ n
RX
p/n
TX
p/n
RX
p/n
1 RS 422 CH
A0
A1
B0
B1
LTC2855
LTC2855
1 RS 422 CH
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