EZ-USB Development Kit User Guide, Doc. # 001-66390 Rev. *D
19
3.
Advanced Development Board
3.1
Introduction
The EZ-USB Advanced Development Board provides a compact evaluation and design vehicle for
the EZ-USB family. The board provides expansion and interface signals on six 20-pin headers. A
mating prototype board allows quick construction and testing of USB designs. All ICs on the board
operate at 3.3 V. The board can be powered from the USB connector.
The EZ-USB Advanced Development Board is supplied as part of the Cypress EZ-USB DVK, which
includes an evaluation version of Cypress-customized software development tools from Keil
Software Inc. The Keil 8051 assembler, C compiler, and debugger work with the development board
to provide a complete code development environment. An 8051 debug monitor is typically loaded
into the development board expansion RAM to leave the internal RAM free for code development.
The evaluation version of the Keil tools that ships with the DVK has several restrictions that make it
inappropriate for real-world development. Most significantly, it limits the compiled object size to 4 KB.
The full retail version allows a code of any size.
3.2
Schematic Summary
Read this description while referring to the EZ-USB FX2LP development board schematic and the
FX2LP development board assembly drawing. Both drawings are located in the
and are available in PDF format in the DVK hardware directory. With the exception of the
EZ-USB chip, the development boards in the FX2LP and FX1 DVKs are identical and are referred to
generically as the EZ-USB development board in the following sections.
U1 is either EZ-USB FX2LP (CY7C68013A-128AC) or FX1 (CY7C64713-128AC). This is the full-
function EZ-USB chip, which brings out the 8051 address and data buses for external memory
expansion. U2, a reprogrammable GAL, provides RAM enable signals for four jumper-selectable
memory maps. U3 is a 128-KB RAM, used for external 8051 memory expansion. Only 64 KB of this
memory is addressed by the 8051; the A16 pin is connected to a pull-up resistor that can be
attached to a GAL output to provide bank switching options.
U4 is a 3.3-V, 500-milliamp voltage regulator. U5 and U6 are socketed EEPROMS, used for EZ-USB
initialization and 8051 general-purpose access. U7 converts the 3.3-V 8051 serial port signals to
bipolar RS-232 levels. U8 and U10 are Philips PCF8574 I/O expanders, which attach to the EZ-USB
I
2
C bus and provide eight GPIO pins. U10 reads the four push-button switches, S2–S5, and U8
drives the 7-segment readout U9.
Six 20-pin headers, P1-P6, provide interface signals to the plug-in prototyping board supplied in this
kit. They also serve as connection points for HP (Agilent) logic analyzer pods. P8 contains a subset
of signals from P1–P6 on a connector that is pinned out for connection to a ‘straight-through’ ATA
cable.
Two slide switches, SW1 and SW2, control the connection and selection of the two socketed
EEPROMS at U5 and U6.
Summary of Contents for CY3674
Page 18: ...18 EZ USB Development Kit User Guide Doc 001 66390 Rev D Getting Started...
Page 34: ...34 EZ USB Development Kit User Guide Doc 001 66390 Rev D Development Kit Contents...
Page 54: ...54 EZ USB Development Kit User Guide Doc 001 66390 Rev D Cypress USB Drivers for EZ USB Kits...
Page 110: ...110 EZ USB Development Kit User Guide Doc 001 66390 Rev D Resources...
Page 113: ...EZ USB Development Kit User Guide Doc 001 66390 Rev D 113 A 2 Board Layout...
