ak7712a-vt AKM Semiconductor, Inc., ak7712a-vt Datasheet - Page 36

• Manufacturer Part Number: ak7712a-vt
• Description: Built-in 20-bit Adc/dac Sophisticated Audio Dsp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
About the timing of ALU, the input of B register actions always, but when ALU is NOP, the value of ACC and flag
are not changed. It becomes possible to output the result to DBUS 2 steps later .
0180-E-02
Command
In each command of ALU, input data is processed as follows.
{: Flag is effective.
NOP
/20
/18
/16
<<
<1
1+
1-
| |
&
+
$
#
-
!
A,+1 +4bits="0"
A,+1 +4bits="0"
A,+1 +4bits="0"
-24bits+1,all"0"
inversion
A input
all "0"
A
A
A
A
A
A
×: Don't care. RE: Reset of overflow register
-23bits+1, all "0"
-20bits+1, all"0"
-18bits+1, all"0"
-16bits+1, all"0"
-24 -29bits="0"
+4 -23bits="1"
inversion+1
B input
all "0"
all "0"
B
B
B
B
B
B
- 36 -
OF ZF SF OV
not change
{ { { RE
{ { { RE
{ { { {
{ { { {
{ { { {
{ { { {
{ { { {
{ { { {
{ { { {
{ { { {
× { × RE
× { × RE
× { × RE
× { × RE
negative: invertion + 1
ALU function
positive: +
EXOR
AND
NOT
[AK7712A-VT]
OR
+
+
+
+
+
+
+
1997/12