Cypress CY7C68034 Default Silicon ID Values Default VID/PID/DID, ReNumeration, Interrupt System

CY7C68033/CY7C68034

Figure 4. NX2LP-Flex Enumeration Sequence

Start-up

values stored in ROM space. The default silicon ID values should only be used for development purposes. Cypress requires designers to use their own Vendor ID for final products. A Vendor ID is obtained through registration with the USB Implementor’s Forum (USB-IF). Also, if the NX2LP-Flex is used as a mass storage class device, a unique USB serial number is required for each device in order to comply with the USB Mass Storage class specification.

Yes

NAND Flash

Programmed?

Yes

Load Firmware

From NAND

Enumerate

According To

Firmware

Normal Operation

Mode

NAND Flash	No
Present?

No

Load Default

Descriptors and

Configuration Data

Enumerate As

Unprogrammed

NX2LP-Flex

Manufacturing

Mode

Cypress provides all the software tools and drivers necessary for properly programming and testing the NX2LP-Flex. Please refer to the documentation in the development kit for more information on these topics.

Table 2. Default Silicon ID Values

Default VID/PID/DID

Vendor ID	0x04B4	Cypress Semiconductor
Product ID	0x8613	EZ-USB®Default
Device release	0xAnnn	Depends on chip revision
		(nnn = chip revision, where first
		silicon = 001)

ReNumeration™

Cypress’s ReNumeration™ feature is used in conjunction with the NX2LP-Flex manufacturing software tools to enable first-time NAND programming. It is only available when used in conjunction with the NX2LP-Flex Manufacturing tools, and is not enabled during normal operation.

Bus-powered Applications

The NX2LP-Flex fully supports bus-powered designs by enumerating with less than 100 mA, as required by the USB 2.0 specification.

Interrupt System

INT2 Interrupt Request and Enable Registers

NX2LP-Flex implements an autovector feature for INT2 and INT4. There are 27 INT2 (USB) vectors, and 14 INT4 (FIFO/GPIF) vectors. See the EZ-USB Technical Reference Manual (TRM) for more details.

Normal Operation Mode

In Normal Operation Mode, the NX2LP-Flex behaves as a USB 2.0 Mass Storage Class NAND Flash controller. This includes all typical USB device states (powered, configured, etc.). The USB descriptors are returned according to the data stored in the configuration data memory area. Normal read and write access to the NAND Flash is available in this mode.

Manufacturing Mode

In Manufacturing Mode, the NX2LP-Flex enumerates using the default descriptors and configuration data that are stored in internal ROM space. This mode allows for first-time programming of the configuration data memory area, as well as board-level manufacturing tests.

Default Silicon ID Values

To facilitate proper USB enumeration when no programmed NAND Flash is present, the NX2LP-Flex has default silicon ID

USB-Interrupt Autovectors

The main USB interrupt is shared by 27 interrupt sources. To save the code and processing time that normally would be required to identify the individual USB interrupt source, the NX2LP-Flex provides a second level of interrupt vectoring, called Autovectoring. When a USB interrupt is asserted, the NX2LP-Flex pushes the program counter onto its stack then jumps to address 0x0500, where it expects to find a ‘jump’ instruction to the USB Interrupt service routine.

Developers familiar with Cypress’s programmable USB devices should note that these interrupt vector values differ from those used in other EZ-USB microcontrollers. This is due to the additional NAND boot logic that is present in the NX2LP-Flex ROM space. Also, these values are fixed and cannot be changed in the firmware.

Document #: 001-04247 Rev. *D Page 5 of 33

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