參數(shù)資料
型號(hào)： AK7712A-VT
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類： 圓形連接器
英文描述： Circular Connector; No. of Contacts:8; Series:MS27484; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:16; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:16-8 RoHS Compliant: No
中文描述： 內(nèi)置20位ADC / DAC的尖端音頻DSP
文件頁(yè)數(shù)： 39/87頁(yè)
文件大小： 968K
代理商： AK7712A-VT
ASAHI KASEI
[AK7712A-VT]
0180-E-02
1997/12
- 39 -
Coefficient RAM(CRAM)
This is a RAM to store coefficient data for such as digital filter, and can be written the data through CBUS/DBUS. 3
ways are prepared for writing. The first way is to be loaded from such as microcomputer at reset of this LSI. The
second way is to write the 16 data written on microcomputer buffer at running state. The last way is writing from
DBUS, that is controlled by appointing at DST field. Output can be done to multiplier directly or to DBUS(lower 8 bits
are "0" ). The capacity of memory is 256 word
×
16-bit. Two pointers are prepared. CP0 is reset to the
address"0(HEX)" and CP1 is reset to "80(HEX)" every sampling cycle, and appointment of pointer is set to CP0. The
address is able to increment(+1) and to decrement(-1). By load command, it is able to load the DBUS data directly
as pointer value. CPC command not only change the pointer but also does increment of the pointer change from.
For example, in the case of changing the pointer from CP0 to CP1, the change CP0
→
CP1 and increment of
address of CP0 are done. The timing is shown below.
CPC: Pointer change(CP0
→
CP1, CP0+1 ; CP1
→
CP0, CP1+1)
CPU: Increment of address(+1)
CPD: Decrement of address(-1)
CRAM: Output the data to DBUS
@CP0: Load the data to CRAM-CP0 pointer (for address)
@CP1: Load the data to CRAM-CP1 pointer (for address)
@CRAM: Write DBUS data
It is explained below how those timing go in actual program.
,OP ,,CPU,,, ,
,OP ,, ,,, ,
,OPCR*DR ,,CPU,,,CRAM,
,OP ,, ,,,TMP0 , @CRAM ;write the data of TMP0 to the address made 1step before by CPU
,OPCR*DR ,, ,,, ,
;output the data written 1step before by @CRAM to CR and DBUS
,OP ,,CPC,,, ,
;
,OP ,, ,,, ,
;
,OP ,, ,,, ,
;output the data of pointer changed 2 steps before by CRC
,OP ,, ,,, ,
;operate with the changed pointer until next CPC is executed
;be able to output to DBUS and multiplier(CR) 2 steps after
;
;
<List of CRAM Relational Command>
相關(guān)PDF資料
PDF描述
AK7714 Circular Connector; No. of Contacts:8; Series:MS27484; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:16; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:16-8 RoHS Compliant: No
AK7714VT Circular Connector; No. of Contacts:8; Series:MS27484; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:16; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:16-8 RoHS Compliant: No
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