BLUENRG-2 datasheet(44/190 Pages) STMICROELECTRONICS

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Functional details

BlueNRG-2

44/190

DocID030675 Rev 2

Source

port

width

Destination

port width

Number of

data items

to transfer

(NDT)

Source

content:

address/data

Transfer operations

Destination

content:

address/data

@0x8 /

BBBAB9B8

3: READ

BBBAB9B8[31:0]

@0x8 then WRITE

B5B4[15:0] @0x4

@0x4 / B9B8

@0xC /

BFBEBDBC

4: READ

BFBEBDBC[31:0]

@0xC then WRITE

B7B6[15:0] @0x6

@0x6 / BDBC

@0x0 /

B3B2B1B0

1: READ

B3B2B1B0[31:0]

@0x0 then WRITE

0000B1B0[31:0]

@0x0

@0x0 /

B3B2B1B0

@0x4 /

B7B6B5B4

2: READ

B7B6B5B4[31:0]

@0x4 then WRITE

0000B3B2[31:0]

@0x4

@0x4 /

B7B6B5B4

@0x8 /

BBBAB9B8

3: READ

BBBAB9B8[31:0]

@0x8 then WRITE

0000B5B4[31:0]

@0x8

@0x8 /

BBBAB9B8

@0xC /

BFBEBDBC

4: READ

BFBEBDBC[31:0]

@0xC then WRITE

0000B7B6[31:0]

@0xC

@0xC /

BFBEBDBC

The DMA is addressed through AHB and can be accessed only with 32-bit access. Any 8-

bit or 16-bit access will generate a hard fault.

When the DMA initiates an AHB byte or halfword write operation, the data are duplicated

on the unused lanes of the HWDATA[31:0] bus. So when the used AHB slave peripheral

does not support byte or halfword write operations (when HSIZE is not used by the

peripheral) and does not generate any error, the DMA writes the 32 HWDATA bits as

shown in the two examples below:



write the halfword “0xABCD”, the DMA sets the HWDATA bus to “0xABCDABCD”

with HSIZE = HalfWord



To write the byte “0xAB”, the DMA sets the HWDATA bus to “0xABABABAB” with

HSIZE = Byte

Assuming that the AHB/APB bridge is an AHB 32-bit slave peripheral that does not take the

HSIZE data into account, it will transform any AHB byte or halfword operation into a 32-bit

APB operation in the following manner:



an AHB byte write operation of the data “0xB0” to 0x0 (or to 0x1, 0x2 or 0x3) will be

converted to an APB wo

rd write operation of the data “0xB0B0B0B0” to 0x0



an AHB half-

word write operation of the data “0xB1B0” to 0x0 (or to 0x2) will be

converted to an APB word write operation of the data “0xB1B0B1B0” to 0x0

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