UM0934 datasheet(54/113 Pages) STMICROELECTRONICS

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Host interface

UM0934

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Doc ID 17389 Rev 2

5.3.13

CMD_DataConfirm (52h)

This command exports the following services to the external host:

●

PHY mode: P_Data.Confirm

●

MAC mode: M_Data.Confirm.

This command is sent by the ST7570 to provide a positive or negative confirmation to a data

request previously requested by the external host.

The data field is a 1-byte field containing the result of the previous request.

When operating in MAC mode and a frame with repetitions (i.e. with credits IC and CC > 0)

is transmitted, the CMD_DataConfirm is always notified as soon as the transmission of the

first MAC frame within the repetition burst is completed (Figure 20).

Figure 20.

Transmission of a MAC frame with repetitions (example with IC=3)

Table 41.

CMD_DataRequest: RequestData (MAC mode)

Byte index

Label

Description

CREDIT

Credit information

b7 – b5: Initial credit IC

b4 - b2: Current credit CC

b1 – b0: Delta credit DC

UART data transmission: LSBit first (from b0 to b7)

1..3

ADDRESS

b23 – b12: MAC source address

b11 – b0: MAC destination address

UART data transmission: MSByte first, LSBit first. Therefore, the 3 bytes

are transmitted following this order:

• From b16 to b23

• From b8 to b15

• From b0 to b7.

PAD

1 byte padding (equal to 00h)

5..246

M_SDU

Mac service data unit (up to 242 bytes).

UART data transmission: MSByte first.

Table 42.

CMD_DataConfirm: Syntax

Source

Command(Args)

Possible response

ST7570

CMD_DataConfirm(ConfirmData)

None

CMD_DataConfirm()

MAC Frame

(IC=3, CC=3)

MAC Frame

(IC=3, CC=2)

MAC Frame

(IC=3, CC=1)

MAC Frame

(IC=3, CC=0)

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