Cirrus-logic AN333 Manual de usuario descargar pdf (Pagina 10)

10 AN333

4 Operating System (OS) Firmware Module

Figure 4-1. Unsolicited Read Command and Data Words

Table 4-1 describes the API used to control the OS firmware module. Indices of the Firmware Module can differ in

properties that are important to the system firmware programmer.

Variables marked by a ‘†’ can be modified after kick-starting the application. However, variables not marked by a ‘†’ must

be configured by the system host controller before the kick-start message is sent to begin decoding. For these indices,

changes after kick-starting the application do not have the desired effect and can potentially cause the application to

become unstable.

All indices are reinitialized to the default values after downloading the overlay and soft-resetting the overlay.

Index = 0xHHHH, data value = 0xhhhhhhhh

Write = 0x8100HHHH 0xhhhhhhhh

Read Request = 0x81C0HHHH

Read Response = 0x01C0HHHH 0xhhhhhhhh

Unsolicited Read Command Word:

313029282726252423222120191817161514131211109876543210

OPCODE[31:16] INDEX[15:0]

Unsolicited Read Data Word:

313029282726252423222120191817161514131211109876543210

DATA WORD[31:0]

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 27 28

Sin comentarios

Cirrus-logic AN333 Manual de usuario Pagina 10