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ETERNA

™ SERIAL PROGRAMMER GUIDE

Eterna Flash Emulator

The Eterna Serial Programmer Software uses the Eterna Flash Emulator, part of the

Eterna integrated circuit, which supports a command protocol over IPCS that allows

manipulation of the main pages on the Eterna Flash. The following describes the details

of the Eterna Flash Emulator protocol.

If a device can is locked with the Hardware Lock Key (see

040-0109 Eterna Board

Specific Parameter Configuration Guide for details), it will prevent access to all internal

memory including the flash. A locked device may be unlocked using UARTC0_RX,

UARTC1_RX and UART_RX as described in the CLI (unlock command) section below.

Notes:

•

UARTC0_RX, UARTC1_RX and UART_RX can always be used for unlocking a

device, regardless of how the pin is configured for use in the product.

•

On some operating systems, e.g. Linux, it may not be possible to load both

D2XX and VCP drivers simultaneously. See the FTDI website for driver

support.

A typical sequence in pseudo code for a simple example follows:

EnterFlashEmulator();

// assert FLASH_P_ENn,

// RESETn high 1ms, RESETn low,

// 10ms wait

BulkErase();

// SPI transaction to send Bulk Erase

command

WaitForRdy();

// SPI reads to poll STATUS until ready

ProgramFlash(

// SPI writes, in 16KB chunks max0x0,

// start of flash

fullImage,

// pointer to buffer with desired image

sizeof(fullImage) );

WaitForRdy();

ReadFlash(

// SPI reads

0x0,

buf,

sizeof(fullImage));

Verify(

// Verify image

buf,

fullImage,

sizeof(fullImage));

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