<s>
The	O
Serial	O
Low-power	O
Inter-chip	O
Media	O
Bus	O
(	O
SLIMbus	B-Architecture
)	O
is	O
a	O
standard	O
interface	O
between	O
baseband	O
or	O
application	O
processors	O
and	O
peripheral	O
components	O
in	O
mobile	O
terminals	O
.	O
</s>
<s>
SLIMbus	B-Architecture
is	O
implemented	O
as	O
a	O
synchronous	O
2-wire	O
,	O
configurable	O
Time	B-Protocol
Division	I-Protocol
Multiplexed	I-Protocol
(	O
TDM	O
)	O
frame	O
structure	O
.	O
</s>
<s>
Physically	O
,	O
the	O
data	O
line	O
(	O
DATA	O
)	O
and	O
the	O
clock	O
line	O
(	O
CLK	O
)	O
interconnect	O
multiple	O
SLIMbus	B-Architecture
components	O
in	O
a	O
multi-drop	B-Architecture
bus	I-Architecture
topology	O
.	O
</s>
<s>
SLIMbus	B-Architecture
devices	O
may	O
dynamically	O
“	O
drop	O
off	O
”	O
the	O
bus	O
and	O
“	O
reconnect	O
”	O
to	O
the	O
bus	O
as	O
required	O
by	O
using	O
appropriate	O
protocols	O
outlined	O
in	O
the	O
SLIMbus	B-Architecture
specification	O
.	O
</s>
<s>
When	O
used	O
in	O
a	O
mobile	O
terminal	O
or	O
portable	O
product	O
,	O
SLIMbus	B-Architecture
may	O
replace	O
legacy	O
digital	O
audio	O
interfaces	O
such	O
as	O
PCM	B-Algorithm
,	O
I2S	O
,	O
and	O
SSI	B-Protocol
(	O
Synchronous	B-Protocol
Serial	I-Protocol
Interface	I-Protocol
for	O
digital	O
audio	O
)	O
,	O
as	O
well	O
as	O
some	O
instances	O
of	O
many	O
digital	O
control	O
buses	O
such	O
as	O
I2C	O
,	O
SPI	O
,	O
microWire	B-Architecture
,	O
UART	O
,	O
or	O
GPIO	B-Architecture
pins	O
on	O
the	O
digital	O
audio	O
components	O
.	O
</s>
<s>
LML-WG	O
released	O
first	O
draft	O
of	O
SLIMbus	B-Architecture
with	O
text	O
in	O
all	O
chapters	O
(	O
v0.55	O
)	O
on	O
October	O
18	O
,	O
2005	O
.	O
</s>
<s>
SLIMbus	B-Architecture
specification	O
v1.00	O
was	O
released	O
to	O
adopters	O
on	O
May	O
16	O
,	O
2007	O
.	O
</s>
<s>
From	O
June	O
2007	O
to	O
June	O
2008	O
,	O
SLIMbus	B-Architecture
specification	O
improvement	O
(	O
ambiguities	O
,	O
typos	O
&	O
bugs	O
fixed	O
)	O
based	O
on	O
implementer	O
feed-back	O
.	O
</s>
<s>
SLIMbus	B-Architecture
specification	O
V1.01	O
was	O
released	O
to	O
adopters	O
on	O
December	O
3	O
,	O
2008	O
and	O
is	O
recommended	O
for	O
implementation	O
.	O
</s>
<s>
SLIMbus	B-Architecture
Device	O
Class	O
definitions	O
are	O
those	O
which	O
specify	O
the	O
minimum	O
requirements	O
for	O
Device	O
control	O
data	O
,	O
Device	O
behavior	O
,	O
and	O
data	O
Transport	O
Protocol	O
support	O
.	O
</s>
<s>
There	O
are	O
four	O
SLIMbus	B-Architecture
Device	O
Classes	O
defined	O
at	O
the	O
release	O
of	O
Version	O
1.01	O
of	O
the	O
SLIMbus	B-Architecture
specification	O
:	O
Manager	O
,	O
Framer	O
,	O
Interface	O
,	O
and	O
Generic	O
.	O
</s>
<s>
Complete	O
SLIMbus	B-Architecture
systems	O
can	O
be	O
implemented	O
without	O
any	O
additional	O
Device	O
Classes	O
.	O
</s>
<s>
The	O
Manager	O
Device	O
is	O
responsible	O
for	O
configuring	O
SLIMbus	B-Architecture
,	O
and	O
performs	O
bus	O
administration	O
(	O
administration	O
of	O
Components	O
and	O
Devices	O
,	O
bus	O
configuration	O
,	O
and	O
dynamic	O
channel	O
allocation	O
)	O
and	O
is	O
typically	O
located	O
in	O
a	O
baseband	O
or	O
application	O
processor	O
rather	O
than	O
in	O
a	O
peripheral	O
component	O
.	O
</s>
<s>
The	O
Framer	O
delivers	O
a	O
clock	O
signal	O
on	O
the	O
CLK	O
line	O
to	O
all	O
SLIMbus	B-Architecture
Components	O
,	O
and	O
also	O
contains	O
logic	O
to	O
transmit	O
the	O
Frame	O
Sync	O
and	O
Framing	O
Information	O
channels	O
on	O
the	O
DATA	O
line	O
.	O
</s>
<s>
The	O
Interface	O
Device	O
provides	O
bus	O
management	O
services	O
,	O
monitors	O
the	O
Physical	O
Layer	O
for	O
errors	O
,	O
reports	O
information	O
about	O
the	O
status	O
of	O
a	O
SLIMbus	B-Architecture
Component	O
,	O
and	O
otherwise	O
manages	O
the	O
Component	O
such	O
that	O
the	O
Devices	O
within	O
it	O
will	O
function	O
properly	O
on	O
the	O
bus	O
.	O
</s>
<s>
To	O
implement	O
a	O
functional	O
SLIMbus	B-Architecture
component	O
always	O
requires	O
the	O
use	O
of	O
a	O
SLIMbus	B-Architecture
Interface	O
Device	O
,	O
plus	O
the	O
function	O
to	O
be	O
performed	O
,	O
such	O
as	O
DAC	O
,	O
ADC	O
,	O
digital	O
amplifier	O
,	O
and	O
so	O
on	O
.	O
</s>
<s>
A	O
SLIMbus	B-Architecture
Component	O
contains	O
two	O
or	O
more	O
SLIMbus	B-Architecture
Devices	O
.	O
</s>
<s>
A	O
SLIMbus	B-Architecture
Component	O
will	O
have	O
only	O
one	O
SLIMbus	B-Architecture
Interface	O
Device	O
(	O
INTERFACE	O
)	O
,	O
and	O
may	O
have	O
one	O
or	O
more	O
other	O
types	O
of	O
SLIMbus	B-Architecture
devices	O
which	O
perform	O
a	O
particular	O
function	O
(	O
FUNCTION	O
)	O
.	O
</s>
<s>
A	O
SLIMbus	B-Architecture
Port	O
(	O
P	O
)	O
provides	O
the	O
connection	O
path	O
for	O
data	O
flow	O
between	O
Devices	O
.	O
</s>
<s>
SLIMbus	B-Architecture
Ports	O
are	O
normally	O
used	O
for	O
digital	O
audio	O
data	O
flow	O
,	O
but	O
may	O
also	O
be	O
used	O
for	O
other	O
digital	O
data	O
flow	O
.	O
</s>
<s>
A	O
simple	O
SLIMbus	B-Architecture
Component	O
example	O
is	O
shown	O
in	O
Figure	O
1	O
below	O
,	O
and	O
a	O
complex	O
SLIMbus	B-Architecture
Component	O
example	O
is	O
shown	O
in	O
Figure	O
2	O
below	O
.	O
</s>
<s>
All	O
SLIMbus	B-Architecture
Devices	O
use	O
DATA	O
and	O
CLK	O
to	O
synchronize	O
with	O
the	O
bus	O
configuration	O
in	O
use	O
,	O
to	O
receive	O
or	O
transmit	O
messages	O
and	O
data	O
,	O
and	O
to	O
implement	O
bus	O
arbitration	O
,	O
collision	O
detection	O
,	O
and	O
contention	O
resolution	O
between	O
devices	O
.	O
</s>
<s>
For	O
all	O
SLIMbus	B-Architecture
Components	O
(	O
except	O
one	O
containing	O
a	O
Framer	O
Device	O
)	O
,	O
the	O
CLK	O
terminal	O
is	O
input	O
only	O
.	O
</s>
<s>
If	O
a	O
SLIMbus	B-Architecture
Component	O
is	O
the	O
Framer	O
Device	O
,	O
or	O
contains	O
a	O
Framer	O
Device	O
,	O
the	O
CLK	O
signal	O
is	O
bi-directional	O
.	O
</s>
<s>
For	O
all	O
SLIMbus	B-Architecture
Components	O
,	O
the	O
DATA	O
line	O
is	O
bidirectional	O
,	O
and	O
carries	O
all	O
information	O
sent	O
or	O
received	O
on	O
the	O
bus	O
using	O
Non-Return-to-Zero	B-Protocol
Inverted	I-Protocol
(	O
NRZI	O
)	O
encoding	O
.	O
</s>
<s>
The	O
DATA	O
line	O
can	O
be	O
driven	O
high	O
,	O
driven	O
low	O
,	O
or	O
held	O
at	O
the	O
high	O
or	O
low	O
level	O
by	O
an	O
internal	O
bus-holder	B-Protocol
circuit	O
,	O
depending	O
upon	O
the	O
particular	O
operational	O
mode	O
of	O
a	O
SLIMbus	B-Architecture
Device	O
.	O
</s>
<s>
The	O
SLIMbus	B-Architecture
interface	O
DATA	O
and	O
CLK	O
lines	O
use	O
CMOS-like	O
single-ended	O
,	O
ground	O
referenced	O
,	O
rail-to-rail	O
,	O
voltage	O
mode	O
signals	O
,	O
and	O
signaling	O
voltages	O
are	O
specified	O
with	O
respect	O
to	O
the	O
interface	O
supply	O
voltage	O
( +	O
1.8Vdd	O
or	O
+	O
1.2Vdd	O
are	O
permitted	O
)	O
.	O
</s>
<s>
For	O
EMI	O
performance	O
reasons	O
,	O
slew	O
rate	O
limits	O
have	O
been	O
specified	O
for	O
SLIMbus	B-Architecture
.	O
</s>
<s>
The	O
SLIMbus	B-Architecture
CLK	O
line	O
frequency	O
is	O
determined	O
by	O
a	O
range	O
of	O
"	O
Root	O
"	O
clock	O
frequencies	O
up	O
to	O
28MHz	O
,	O
and	O
10	O
Clock	O
Gears	O
for	O
altering	O
the	O
clock	O
frequency	O
by	O
powers	O
of	O
2	O
over	O
a	O
span	O
of	O
512x	O
from	O
lowest	O
to	O
highest	O
Gear	O
.	O
</s>
<s>
The	O
SLIMbus	B-Architecture
CLK	O
may	O
also	O
be	O
stopped	O
and	O
restarted	O
.	O
</s>
<s>
SLIMbus	B-Architecture
CLK	O
frequencies	O
and	O
data	O
transport	O
protocols	O
will	O
support	O
all	O
common	O
digital	O
audio	O
converter	O
over-sampling	O
frequencies	O
and	O
associated	O
sample	O
rates	O
.	O
</s>
<s>
The	O
SLIMbus	B-Architecture
Frame	O
Structure	O
has	O
five	O
building	O
blocks	O
:	O
Cells	O
,	O
Slots	O
,	O
Frames	O
,	O
Subframes	O
,	O
and	O
Superframes	O
.	O
</s>
<s>
A	O
Subframe	O
is	O
defined	O
as	O
the	O
division	O
of	O
the	O
Frame	O
Structure	O
at	O
which	O
Control	O
Space	O
and	O
Data	O
Space	O
are	O
interleaved	B-Error_Name
.	O
</s>
<s>
The	O
Superframe	O
rate	O
can	O
be	O
dynamically	O
changed	O
on	O
SLIMbus	B-Architecture
to	O
suit	O
the	O
particular	O
application	O
by	O
changing	O
either	O
SLIMbus	B-Architecture
Root	O
Frequency	O
or	O
Clock	O
Gear	O
,	O
or	O
both	O
.	O
</s>
<s>
Information	O
on	O
the	O
SLIMbus	B-Architecture
DATA	O
line	O
is	O
allocated	O
to	O
Control	O
Space	O
and	O
Data	O
Space	O
channels	O
.	O
</s>
<s>
The	O
Control	O
Space	O
may	O
be	O
dynamically	O
programmed	O
to	O
take	O
as	O
much	O
of	O
the	O
SLIMbus	B-Architecture
bandwidth	O
as	O
required	O
,	O
even	O
up	O
to	O
100%	O
at	O
times	O
.	O
</s>
<s>
SLIMbus	B-Architecture
Components	O
convey	O
control	O
and	O
data	O
information	O
between	O
each	O
other	O
using	O
Control	O
and	O
Data	O
Channels	O
with	O
Transport	O
Protocols	O
to	O
achieve	O
the	O
required	O
system	O
operation	O
.	O
</s>
<s>
SLIMbus	B-Architecture
Device	O
Ports	O
are	O
associated	O
with	O
Data	O
Channels	O
using	O
appropriate	O
channel	O
connection	O
and	O
dis-connection	O
Messages	O
.	O
</s>
<s>
For	O
data	O
flow	O
between	O
Ports	O
attached	O
to	O
Channels	O
,	O
SLIMbus	B-Architecture
supports	O
a	O
small	O
group	O
of	O
frequently	O
used	O
Transport	O
Protocols	O
(	O
including	O
a	O
User	O
Defined	O
Transport	O
Protocol	O
)	O
which	O
define	O
data	O
flow	O
type	O
,	O
flow	O
control	O
mechanism	O
,	O
and	O
a	O
side-channel	O
(	O
if	O
any	O
)	O
for	O
any	O
additional	O
application-specific	O
information	O
.	O
</s>
<s>
User	O
1	O
&	O
2	O
protocols	O
are	O
used	O
to	O
extend	O
SLIMbus	B-Architecture
's	O
data	O
transmission	O
mechanisms	O
and	O
it	O
is	O
assumed	O
that	O
a	O
Device	O
connected	O
to	O
a	O
User	O
Protocol	O
Data	O
Channel	O
knows	O
the	O
definition	O
of	O
the	O
TAG	O
and	O
AUX	O
bits	O
and	O
how	O
they	O
are	O
used	O
.	O
</s>
<s>
A	O
SLIMbus	B-Architecture
system	O
for	O
illustrative	O
purposes	O
only	O
is	O
shown	O
in	O
Figure	O
7	O
below	O
.	O
</s>
<s>
Note	O
that	O
the	O
upper	O
left	O
SLIMbus	B-Architecture
Component	O
in	O
this	O
example	O
contains	O
a	O
Framer	O
Device	O
(	O
F	O
)	O
,	O
and	O
therefore	O
the	O
CLK	O
signal	O
for	O
this	O
component	O
is	O
bidirectional	O
.	O
</s>
<s>
The	O
upper	O
left	O
SLIMbus	B-Architecture
Component	O
also	O
contains	O
a	O
Manager	O
Device	O
(	O
M	O
)	O
.	O
</s>
<s>
However	O
,	O
there	O
is	O
no	O
requirement	O
that	O
the	O
Manager	O
and	O
the	O
Framer	O
Devices	O
be	O
in	O
the	O
same	O
SLIMbus	B-Architecture
Component	O
.	O
</s>
<s>
The	O
Manager	O
and/or	O
Framer	O
Device	O
shown	O
in	O
the	O
upper	O
left	O
SLIMbus	B-Architecture
Component	O
can	O
also	O
be	O
incorporated	O
into	O
baseband	O
and/or	O
applications	O
processors	O
typically	O
used	O
to	O
build	O
mobile	O
terminals	O
.	O
</s>
<s>
Figure	O
8	O
below	O
shows	O
a	O
conceptual	O
view	O
of	O
a	O
possible	O
real	O
world	O
SLIMbus	B-Architecture
system	O
.	O
</s>
