L9788 datasheet(182/264 Pages) STMICROELECTRONICS

182 / 264 page

Micro second channel (MSC) interface

L9788

182/264

DS12308 Rev 4

Figure 84. MSC Command Frame bit stream

18.2.2

Data frame

A data frame always starts with a low level bit (data selection bit). The number of the data bit

of the active phase of a data frame NDB is fixed to 31 bits:

If the number of the data bit is not equal to NDB = 31 the frame will be ignored and the error

flag (TRANS_L) will be set, but no action on outputs is taken.

The length of the data frame's passive phase tCPP must be a minimum of 2 * tCL.

Figure 85. MSC Data Frame bit stream

Content of DATA frame (transmitted LSB first)

Table 87. MSC Interface command frame

bit

Description

=’1’: command selection bit

1-7

Command. LSB first!

8-15

Data for the command. LSB first!

MSC_EN

INVALID

CMD

INVALID

LSB

MSB

Active level

LSB

MSB

Downstream Command Frame (16 bits)

tCPP

Address field (7 bits)

Data field (8 bits)

GADG1312161204PS

CMD

INVALID

LSB

D10

D11

D12

D13

D30

Active level

MSB

Downstream Data Frame (32 bits)

tCPP

Data field (31 bits)

GADG2112161207PS

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