參數(shù)資料
型號(hào)： STLC1502
廠商： 意法半導(dǎo)體
英文描述： VOICE OVER IP PROCESSOR
中文描述： IP語(yǔ)音處理器
文件頁(yè)數(shù)： 54/81頁(yè)
文件大小： 526K
代理商： STLC1502
STLC1502
54/81
7.9.2 Receive Message from ARM by Host Processor
After receiving interrupt from ARM:
Clear Output Index Register (address b.001) by writing any value.
Read message from Output Message Buffer by consecutively reading from its address (b.110). Each
read will cause the Output Index Register to increment by 1 and access another byte location.
Clear the Output Status Reg (address b.000) by writing any value (the ARM can clear the OSR by
writing 0 to it).
7.9.3 Send Message from ARM to Host Processor
Read Output Status Register. If h0001, the HP has not read out the last message. If 0x0000, the HP
has read the last message and the Output Message Buffer is available for use.
Write message into Output Message Buffer. This buffer is directly addressable by the ARM.
Write 0x0001 to Output Status Register to interrupt the HP
7.9.4 Receive Message from Host Processor by ARM
After receiving interrupt from HP:
Read message from Input Message Buffer.This buffer is directly addressable by the ARM.
Clear the Input Status Reg by writing 0x0001 to its address (the HP can clear the ISR by writing 0 to
it).
In the following table there is the list of the available external signals of the HPI interface.
Table : External signals of HPI
7.9.5 HPI Memory map
NAME
Signal type
Description
HPI_CLK
IN
HPI bus clock form Host Processor
HPI_CS
IN
Active low select from Host Processor.
HPI_AS
IN
Address strobe from Host Processor.
HPI_R
W
IN
R/W from Host Processor
HPI_ADDR(2:0)
IN
Host Processor address
HPI_DATA(7:0)
INOUT
Host Processor data bus lines.
HP_INT
OUT
Interrupt to Host Processor
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