YSS901 Datasheet, PDF (7/14 Pages) List of Unclassifed Manufacturers – SD Stereo dipole

YSS901
g Serial Microcomputer Interface
Format for writing data through microcomputer
After setting the address (A0 and A1) through SI, it is possible to write data (D0 to D7) into the specified address
when R/W bit has been set to “0”. The address map is as shown below.
Address
A1, A0
00
01
10
11
Data
D0
D1
D2
D3
D4
D5 to D7
D0
D1
D2
D3 to D7
D7 to D0
D7 to D0
Description
CSEL0
CSEL1
CSEL2
BSFT0
BSFT1
To be “0”.
Write address selection
Write address counter clear
RAM clear
To be “0”.
Coefficient data to be written (higher byte)
Coefficient data to be written (lower byte)
How to write coefficient data into RAM
Two coefficients are used as a set, each constituted with 16 bits x 125 taps.
The first coefficient (“coef1” shown in the block diagram) is written into RAM address 0-124, and the second one
(“coef2” shown in the block diagram) into RAM address 125-249.
The address counter for writing the data uses seven (7) bits, the upper bit (8th bit) uses “write address selection” of
D2 with A1, A0 = 0 1.
Data writing procedure
(1) Clear the RAM and write address counter. (RAM clear needs up to 2 fs to be completed.)
(2) When the RAM has been cleared, write data into higher byte and then into lower byte starting at the first
byte of the first coefficient. (When the writing into the lower byte has been completed, the data is actually
written into RAM. Wait 1 fs before writing the data into higher byte of the next coefficient.)
(3) When the first coefficient has been written, write the second one by using the same procedure. Set the
“write address selection” bit to “1” when writing data into the 4th tap and after of the second coefficient.
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