AX68002QF datasheet(25/57 Pages) ASIX

25 / 57 page

AX6800x

2/4-Port USB KVM Switch SoC

2.4 Flash Controller and On-Chip Flash Memory

2.4.1 Program Loader

The Program Loader activates right after chip reset or software reboot command and performs copying CPU

program code from on-chip Flash memory to on-chip 8K bytes Program SRAM for “Program Code Mirroring”.

2.4.2 Flash Controller and In-Application Programming

Flash Controller supports Flash memory access related Word Read, Word Write, Sector Erase, Chip Erase

command signal generation needed for CPU’s special SFR access and software DMA’s write access. Along with

Software DMA controller, it supports various DMA transfer direction such as Flash memory to External Data

Memory (P2D), External Data Memory (xDATA) to Flash memory (D2P), Flash memory to Flash memory (P2P),

etc. for so-called In-Application Programming (IAP) function during run-time. For each Word Write access, Flash

Controller will perform the read back check automatically. If the read back check encountered the mismatch

happened, the Flash Controller will interrupt CPU to inform the current Word Write access is incorrect.

2.4.3 In-System Programming

ISP Controller supports In-System Programming (ISP) function through either UART 0 interface to program

on-chip Flash memory.

Upon enabled (via BURN_FLASH_EN pin), ISP controller allows on-chip Flash memory to be programmed by

ASIX’s Flash Programming utility software on a PC with a standard RS-232 port. The link speed (baud rate) of

UART 0 used for communicating to the PC’s RS-232 port can be selectable between 921.6K or 115.2K bps (via

BURN_FLASH_921K pin). When developing AX6800x software or manufacturing AX6800x based systems,

ASIX’s Flash Programming utility can provide easy and fast Flash memory programming capability.

2.4.4 On-Chip Flash Memory

The main features of the on-chip Flash memory are listed below,



Requires only 1.8V power for read, erase and write operations



Fast Read, Write and Erase



Read access time: 40ns



Write (programming) access time: 20us (typical)



Page erase time: 2ms



Mass Erase time: 10ms



Minimum 100,000 erase/program cycles



Minimum 10 years data retention under maximum 20 times pre-cycles



Program code download protection in hardware to prevent unauthorized program code download.

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