User manual

CY7C67200
Document #: 38-08014 Rev. *G Page 2 of 78
Introduction
EZ-OTG™ (CY7C67200) is Cypress Semiconductor’s first
USB On-The-Go (OTG) host/peripheral controller. EZ-OTG is
designed to easily interface to most high-performance CPUs
to add USB host functionality. EZ-OTG has its own 16-bit RISC
processor to act as a coprocessor or operate in standalone
mode. EZ-OTG also has a programmable IO interface block
allowing a wide range of interface options.
Processor Core Functional Overview
An overview of the processor core components are presented
in this section.
Processor
EZ-OTG has a general purpose 16-bit embedded RISC
processor that runs at 48 MHz.
Clocking
EZ-OTG requires a 12 MHz source for clocking. Either an
external crystal or TTL-level oscillator may be used. EZ-OTG
has an internal PLL that produces a 48 MHz internal clock from
the 12 MHz source.
Memory
EZ-OTG has a built-in 4K × 16 masked ROM and an 8K × 16
internal RAM. The masked ROM contains the EZ-OTG BIOS.
The internal RAM can be used for program code or data.
Interrupts
EZ-OTG provides 128 interrupt vectors. The first 48 vectors
are hardware interrupts and the following 80 vectors are
software interrupts.
General Timers and Watchdog Timer
EZ-OTG has two built-in programmable timers and a
watchdog timer. All three timers can generate an interrupt to
the EZ-OTG.
Power Management
EZ-OTG has one main power-saving mode, Sleep. Sleep
mode pauses all operations and provides the lowest power
state.
Interface Descriptions
EZ-OTG has a variety of interface options for connectivity, with
several interface options available. See Table 1 to understand
how the interfaces share pins and can coexist. Below are
some general guidelines:
• I2C EEPROM and OTG do not conflict with any interfaces
• HPI is mutually exclusive to HSS, SPI, and UART
Table 1. Interface Options for GPIO Pins
GPIO Pins HPI HSS SPI UART I2C OTG
GPIO31 SCL/SDA
GPIO30 SCL/SDA
GPIO29 OTGID
GPIO24 INT
GPIO23 nRD
GPIO22 nWR
GPIO21 nCS
GPIO20 A1
GPIO19 A0
GPIO15 D15 CTS
GPIO14 D14 RTS
GPIO13 D13 RXD
GPIO12 D12 TXD
GPIO11 D11 MOSI
GPIO10 D10 SCK
GPIO9 D9 nSSI
GPIO8 D8 MISO
GPIO7 D7 TX
GPIO6 D6 RX
GPIO5 D5
GPIO4 D4
GPIO3 D3
GPIO2 D2
GPIO1 D1
GPIO0 D0
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