Cypress CY7C67200 manual Introduction, Processor Core Functional Overview, Interface Descriptions

CY7C67200

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.

Table 1. Interface Options for GPIO Pins

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

	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
Document #: 38-08014 Rev. *G							Page 2 of 78

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