35
Table 3-7
Programmable oscillator control pin, Signal Name, I/O standard, Pin Assignments
and Descriptions
Programmable
Oscillator
Schematic
Signal Name
I/O Standard
Cyclone V GX
Pin Number
Description
U20 (Si5338)
I2C_SCL
2.5-V
PIN_B7
I2C bus, direct
connected with Si5338
I2C_SDA
2.5-V
PIN_G11
3
3
.
.
4
4
R
R
S
S
-
-
2
2
3
3
2
2
S
S
e
e
r
r
i
i
a
a
l
l
P
P
o
o
r
r
t
t
t
t
o
o
U
U
S
S
B
B
i
i
n
n
t
t
e
e
r
r
f
f
a
a
c
c
e
e
The RS-232 is designed to perform communication between board and PC, allowing a transmission
speed of up to 3Mbps. This interface wouldn’t support HW flow control signals. The physical
interface is done using UART-USB on-board bridge from a FT232R chip and connects to the host
using a USB Type-B connector. For detailed information on how to use the transceiver, please refer
to the datasheet, which is available on the manufacturer’s website, or under the Datasheets\FT232
folder on the Kit System CD.
shows the related schematics, and
lists the
RS-232 pin assignments, signal names and functions.
Figure 3-14 Connections between the Cyclone V GX FPGA and FT232R Chip
Table 3-8
RS-232 Pin Assignments, Schematic Signal Names, and Functions
Schematic
Signal Name
Description
I/O Standard
Stratix V GX Pin
Number
UART_TX
Transmit Asynchronous Data Output
2.5-V
PIN_L9
UART_RX
Receiving Asynchronous Data Input
PIN_M9
