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R
ML410 Embedded Development Platform
UG085 (v1.7.2) December 11, 2008
Downloaded from
Elcodis.com
electronic components distributor
RS-232 Ports
Two RS-232 ports, shown in
independent MAX3232 transceivers (U7 and U46). The FPGA RS-232 ports are wired as
DTE and meet the EIA/TIA-574 standard. The ports are accessible via two DB9M
connectors integrated on the P1 connector assembly.
From FPGA
UART0_TXD
UART0_RTS_N
UART0_RXD
UART0_CTS_N
C330
0.1UF
C331
0.1UF
From FPGA
UART1_TXD
UART1_RTS_N
UART1_RXD
UART1_CTS_N
C330
0.1UF
C331
0.1UF
Figure 2-10: FPGA UART and RS-232 Connectivity
Table 2-12
and
Table 2-13, page 44
and UART1.
Table 2-12: FPGA RS-232 Connections for UART0
Signal Name
UART0_CTS_N
UART0_RTS_N
UART0_RXD
UART0_TXD
Figure
2-10, are connected to the FPGA (U37) through
U7
11
14
DIN1
DOUT1
10
7
DIN2
DOUT2
12
13
ROUT1
RIN1
9
8
ROUT2
RIN2
VCC3V3
1
16
C1+
VCC
C326
0.1UF
3
2
C1-
V+
4
6
C2+
V-
C327
0.1UF
5
15
C2-
GND
MAX3232
U46
11
14
DIN1
DOUT1
10
7
DIN2
DOUT2
12
13
ROUT1
RIN1
9
8
ROUT2
RIN2
VCC3V3
1
16
C1+
VCC
C326
0.1UF
3
2
C1-
V+
4
6
C2+
V-
C327
0.1UF
5
15
C2-
GND
MAX3232
show the RS-232 connections to the FPGA for UART0
FPGA Pin (U37)
G6
F6
E6
D6
www.xilinx.com
Detailed Description
Serial Port A
COM0_TXD_N
DSR
6
COM0_RTS
RTS
7
COM0_RXD_N
CTS
8
RI
9
COM0_CTS
RS-232 DTE pinout connects
to PC with F/F null modem cable.
VCC3V3
C313
0.1UF
Serial Port B
COM1_TXD_N
DSR
6
COM1_RTS
RTS
7
COM1_RXD_N
CTS
8
COM1_CTS
RI
9
RS-232 DTE pinout connects
to PC with F/F null modem cable.
VCC3V3
C313
0.1UF
1
CD
2
RX
3
TX
4
DTR
5
GND
1
CD
2
RX
3
TX
4
DTR
5
GND
UG085_10_120605
43
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