Key Components Description and Operation
UG0617 User Guide Revision 4.0
20
JTAG/FTDI programming (J32): JTAG_SEL is used to switch between embedded FlashPro5 FTDI JTAG
programming (high) and external FlashPro4 JTAG programming (low). JTAG_SEL can be enabled
through the JTAG_SEL_FTDI signal from the FTDI chip (short pins 2-4 in J32).
FTDI JTAG/SPI slave programming: Jumper J27 is used to switch between FTDI JTAG (high) and FTDI
SPI slave programming (low).
RVI header: A 10 × 2 RVI header is provided on the board for debugging. This header allows plugging in
the Keil ULINK debugger or IAR J-Link debugger to easily debug or configure the Cortex-M3 processor
during board power-up.
FlashPro4 programming header (J22): The RTG4 device on this Development Kit can be programmed
using a FlashPro4 programmer. In addition, SoftConsole uses FlashPro4 for software debugging.
For more information, see the Board Level Schematics document (provided separately).
4.7
FTDI Interface
The FT4232H chip is a USB 2.0 high-speed (480 Mbps) to UART/MPSSE interface with the following key
features:
•
Single-chip USB-to-quad serial ports in various configurations
•
Entire USB protocol handled on the chip without requiring USB-specific firmware programming
•
USB 2.0 high-speed (480 Mbps) and full-speed (12 Mbps) compatibility
•
Two MPSSEs on channel A and channel B to simplify synchronous serial protocol (USB to JTAG,
I
2
C, SPI, or bit-bang) design
•
Fully assisted hardware handshaking and X-On or X-Off software handshaking
•
+1.8 V (chip core) and +3.3 V I/O interfacing with +5 V tolerance
The following figure shows the FTDI interface of the RTG4 Development Board.
Figure 13 •
FTDI Interface
Table 9 •
Programming Jumper Selection
J27
J32
Description
X
L
FP4 JTAG programming (Connect Programmer to J22 header)
H
H
FTDI JTAG programming
L
X
FTDI SPI slave programming
Mux
RTG4
USB Mini-B
Connector
(J47)
FT4232
FP4/FP5
Header
(J22)
Mux
JTAG
(Bank3)
SC_SPI
JTAG_SEL
JTAG
J27
L
L
H H
J32
AD
TXD—E28
RXD—E27
SCL—G30
SDA—G31
UART
I2C
MSIO
MSIO
BD
CD
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