CY7C68013
Document #: 38-08012 Rev. *E
Page 2 of 48
Cypress’s EZ-USB FX2
is the world’s first USB 2.0
integrated microcontroller. By integrating the USB 2.0 trans-
ceiver, SIE, enhanced 8051 microcontroller, and a program-
mable peripheral interface in a single chip, Cypress has
created a very cost-effective solution that provides superior
time-to-market advantages. The ingenious architecture of FX2
results in data transfer rates of 56 Mbytes per second, the
maximum allowable USB 2.0 bandwidth, while still using a low-
cost 8051 microcontroller in a package as small as a 56 SSOP.
Because it incorporates the USB 2.0 transceiver, the FX2 is
more economical, providing a smaller footprint solution than
USB 2.0 SIE or external transceiver implementations. With
EZ-USB FX2, the Cypress Smart SIE handles most of the USB
1.1 and 2.0 protocol in hardware, freeing the embedded micro-
controller for application-specific functions and decreasing
development time to ensure USB compatibility. The General
Programmable Interface (GPIF) and Master/Slave Endpoint
FIFO (8- or 16-bit data bus) provides an easy and glueless
interface to popular interfaces such as ATA, UTOPIA, EPP,
PCMCIA, and most DSP/processors.
2.0
Applications
• DSL modems
• ATA interface
• Memory card readers
• Legacy conversion devices
• Cameras
• Scanners
•Home PNA
• Wireless LAN
• MP3 players
• Networking.
The “Reference Designs” section of the cypress website
provides additional tools for typical USB 2.0 applications. Each
reference design comes complete with firmware source and
object code, schematics, and documentation. Please visit
http://www.cypress.com for more information.
3.0
Functional Overview
3.1
USB Signaling Speed
FX2 operates at two of the three rates defined in the Universal
Serial Bus Specification Revision 2.0, dated April 27, 2000:
• Full speed, with a signaling bit rate of 12 Mbps
• High speed, with a signaling bit rate of 480 Mbps
FX2 does not support the low-speed signaling mode of
1.5 Mbps.
3.2
8051 Microprocessor
The 8051 microprocessor embedded in the FX2 family has
256 bytes of register RAM, an expanded interrupt system,
three timer/counters, and two USARTs.8051 Clock Frequency
FX2 has an on-chip oscillator circuit that uses an external
24-MHz (±100 ppm) crystal with the following characteristics:
• Parallel resonant
• Fundamental mode
• 500-
µW drive level
• 20–33 pF (5% tolerance) load capacitors.
An on-chip PLL multiplies the 24-MHz oscillator up to
480 MHz, as required by the transceiver/PHY, and internal
counters divide it down for use as the 8051 clock. The default
8051 clock frequency is 12 MHz. The clock frequency of the
8051 can be changed by the 8051 through the CPUCS
register, dynamically.
The CLKOUT pin, which can be tri-stated and inverted using
internal control bits, outputs the 50% duty cycle 8051 clock, at
the selected 8051 clock frequency—48, 24, or 12 MHz.
3.2.1
USARTS
FX2 contains two standard 8051 USARTs, addressed via
Special Function Register (SFR) bits. The USART interface
pins are available on separate I/O pins, and are not multi-
plexed with port pins.
UART0 and UART1 can operate using an internal clock at 230
KBaud with no more than 1% baud rate error. 230-KBaud
operation is achieved by an internally derived clock source that
generates overflow pulses at the appropriate time. The
internal clock adjusts for the 8051 clock rate (48, 24, 12 MHz)
such that it always presents the correct frequency for
230-KBaud operation.
Note. 115-KBaud operation is also possible by programming
the 8051 SMOD0 or SMOD1 bits to a “1” for UART0 and/or
UART1, respectively.
3.2.2
Special Function Registers
Certain 8051 SFR addresses are populated to provide fast
access to critical FX2 functions. These SFR additions are
shown in Table 3-1. Bold type indicates non-standard,
enhanced 8051 registers.
The two SFR rows that end with “0” and “8” contain bit-addres-
sable registers. The four I/O ports A–D use the SFR addresses
used in the standard 8051 for ports 0–3, which are not imple-
mented in FX2.
Because of the faster and more efficient SFR addressing, the
FX2 I/O ports are not addressable in external RAM space
(using the MOVX instruction).
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