RH850 datasheet(14/66 Pages) RENESAS

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Data Flash Access Library - Type T01, European Release

Functional Specifications

R01US0079ED0103

User Manual

Chapter 3

Functional Specifications

3.1 Supported functions, commands and Flash operations

For a better understanding of the flows and mechanisms required for an FDL usage, the basic functions

of the FDL are introduced in the following. The API of the FDL is thereby, on the one hand based on

functions used to manage the operation of the library itself, on the other hand it offers so-called

commands to access and control the content of the FDL pool.

The following table list

s up all functions, the library will support. Please refer to the chapter 4.4 “Functions”

for detailed descriptions.

Table 1: FDL Function

Function

Description

R_FDL_Init

Initialize the library and Flash hardware

R_FDL_Execute

Initiate a Flash operation

R_FDL_Handler

Control an initiated Flash operation and forward the

status.

R_FDL_SuspendRequest

Request suspending an on-going Flash operation

R_FDL_ResumeRequest

Resume a suspended Flash operation

R_FDL_StandBy

Suspend an on-going Flash operation from an

asynchronous context

R_FDL_WakeUp

Wake-up the FDL from Stand-by state

R_FDL_GetVersionString

Return a pointer to the library version string

Commands are used to manage the FDL pool. Commands are initiated via R_FDL_Execute and the

further progress is controlled by regular execution of R_FDL_Handler.

The following commands can be used to execute the following Flash operations:

Table 2: FDL commands and operations

Command

Initiated Flash

operation

Description

R_FDL_CMD_ERASE

Flash erase

Erase one or more Flash blocks

R_FDL_CMD_WRITE

Flash write

Write one or more Flash words

R_FDL_CMD_BLANKCHECK Flash blank check

Blank Check one or more Flash words. Return the fail

address in case some Flash word is not blank

R_FDL_CMD_READ

Flash data read

Read one or more Flash words to a buffer. Return a

possible ECC (Error correction code) error to the

application together with the address of the error

The following picture shows the basic flow of Flash operations at the example of erasing 2 Flash blocks.

While the Flash hardware can only Erase or Write one unit (Erase 1 block, Write 1 word), the FDL will

manage handling multiple units. Blank Check is executed on word basis but internally it is split in multiple

units at each multiple of 0x4000 bytes boundary.

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