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參數(shù)資料
型號: ADSP-21MOD870-100
廠商: ANALOG DEVICES INC
元件分類: 調(diào)制器/解調(diào)器
英文描述: Single Chip Digital Modem(單片數(shù)字調(diào)制解調(diào)器)
中文描述: 56 kbps DATA, 8 kbps FAX, MODEM, PQFP100
封裝: TQFP-100
文件頁數(shù): 2/3頁
文件大小: 16K
代理商: ADSP-21MOD870-100
This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Analog Devices assumes no
obligation regarding future manufacturing unless otherwise agreed to in writing.
writes the starting address of the transfer and then writes
the first word of data. After the first write, the IDMA
address generator automatically increments; the host
writes the next data word and the IDMA transfers that
word to the next location in ADSP-21mod870 memory.
The executable image contains both code and data
which must be loaded into both program and data mem-
ory. Program memory on the ADSP-21mod870 is 24-
bits wide therefore two transfers are used to load each
word of program memory.
The host begins the download by asserting the RESET/
pin of the ADSP-21mod870. The host then transfers all
code and data. The ADSP-21mod870 begins execution
after the last word of program code is written to location
0. All internal memory can be loaded in 5 ms.
Control Interface
The ADSP-21mod870 is controlled via two unidirec-
tional mailboxes. The host sends a command by writing
to the
host-to-modem
mailbox. After the modem reads
the command, it clears the mailbox. The ADSP-
21mod870 sends a response to the host by writing an
indication back to the
modem-to-host
mailbox. Analog
Devices provides a list of mailbox commands and indi-
cations.
Data Interface
All data transferred to and from the ADSP-21mod870
passes through byte-FIFOs located in internal memory
on the ADSP-21mod870. The two FIFOs are accessed
through a control structure which contains: a pointer to
the start of the FIFO in memory, the length of the FIFO
in 16-bit words, a pointer to the next address to be read,
a pointer to the next address to be written, and two
words indicating whether there are an odd or even num-
ber of bytes to be read and written in the next word. The
transmit and receive FIFOs are each 328 bytes deep.
Example code providing primitives for accessing the
byte-FIFOs is available from Analog Devices.
Modem Statistics
Several modem statistics can be gathered through the
IDMA port. These include the following: call status,
modulation in use, connect rate, transmit and receive
data rate, symbol rate, retrain count, rate re-negotiation
count and others.
Software Interface Summary
A description of the API for the example code is shown
in the following table.
Function
Example
Download
download_image()
Control
send_command()
read_indication()
Data
read_fifo()
write_fifo()
get_space_in_fifo()
get_bytes_in_fifo()
Statistics
read_modem_parameter()
Figure 1 ADSP-21mod870 Network Access System
相關(guān)PDF資料
PDF描述
ADSP-21MOD870-110 Internet Gateway Processor Software
ADSP-21MOD870 Internet Gateway Processor
ADSP-21MOD870-000 Internet Gateway Processor
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ADSP-21XX4444 ADSP-2100 Family DSP Microcomputers
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