American Megatrends MegaRAC M300V, User Manual

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64 MegaRAC® M300V Card Implementer’s Reference and User’s Guide
MegaRAC M300V Card Present and in Non-SoL Mode
CARD_DETECT_L= Logic Low
MCARD_AUX_SoL_CTRL_L= Logic High
The motherboard UART TXD and RXD signals are routed to the motherboard’s serial connector
through MegaRAC M300V card. The MegaRAC M300V card UART1 monitors the RXD signal
for an escape (ESC) sequences so that it can switch between
SoL Mode
and
Non-SoL Mode
. The
motherboard UART control signals are routed to motherboard’s serial connector. The MegaRAC
M300V card UART0 is in
No Connect
mode.
X1
X2 X3
X4
X5
RS232 xlator
Connector
UART0 UART1
UART
BMC
CLI
Generator
ESC Snoop
BMC
Local Bus
Management
NIC
Ethernet
Super I/ O
Host System
Handshake Signals
UAR
T Handshake Signals
SoL / ESC Snoop
TxD, RxD
mCard
Present
B not used when card installed
On-card TxD/ RxD
signal mux control
Handshake signal mux control
from mCard
Driven by UART but not felt at connector
TxD, RxD
TxD, RxD
Rx
A
B
Y
A
B
Y
A
B
Y
A
B
Y
A
B
Y
X1
X2 X3
UART0 UART1
BMC
CLI
Generator
E
SC Snoop
BMC
Local Bus
M
ana
g
emen
t
NI
C
SoL / ESC Snoop
T
x
D,
R
x
D
On-card TxD/ RxD
signal mux control
Rx
A
B
Y
A
B
Y
A
B
Y
In this configuration the X4 De-MUX direction is from Y to A and the X5 MUX direction is from
B to Y.