MHL (Mobile high-de nition link) Technical overview · 4 1280×720p 59.94/60 top-bottom frame...
Transcript of MHL (Mobile high-de nition link) Technical overview · 4 1280×720p 59.94/60 top-bottom frame...
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Micro USB
Transmitter end (TX end) = source Receiver end (RX end) = sink
HDMI type A3MHL+
2MHL–
5GND
4CBUS
1 VBUS
18VBUS
9MHL–
7MHL+
19CBUS
GND17,11,5
CBUS
TMDS channel (MHL–/MHL+)
VBUS
GND
1x buffering
Commonmodemodulaton
MHL streamData islandencoding
EncryptionAudio/videoand controllogic
CH0
CH2Content
Pixel clock
MHL clock
MHL+/MHL–
Period control signal
CH2 CH1 CH0
t2 t1 t0
3x clock multiplier
Video encoding
Control periodencoding
Logical channels Physical channel
CH1
½x multiplier
Commonmodemodulaton
MHL streamData islandencoding
EncryptionAudio/videoand controllogic
CH0
CH1Content
Pixel clock
MHL clock
Period control signal
CH1 CH0 CH1
t3 t2 t1
CH0
t0
2x clock multiplier
Video encoding
Control periodencoding
Logical channels Physical channel
Commonmodedemodulaton
MHL streamTMDSdecoding
DecryptionAudio/video and controllogic
CH0
CH1
CH2Content
3x clockmultiplier
1x buffering Pixel clock
MHL clock
Period control signal
CH2 CH1 CH0
t2 t1 t0
MHL+/MHL–
Commonmodedemodulaton
MHL streamTMDSdecoding
DecryptionAudio/video and controllogic
CH0
CH1Content
4x clockmultiplier
2x multiplier Pixel clock
MHL clock
MHL+/MHL–
Period control signal
CH0 CH1 CH0
t2 t1 t0
CH1
t3
0x00
MHL (Mobile high-defi nition link)Technical overview
Mobile high-definition link
MHL is the new leading mobile device interface for transmitting video and audio. This interface can connect smartphones, tablet PCs and video cameras with display equipment such as TV sets, projectors and monitors. MHL uses the micro USB port which is already available on many mobile devices. The USB interfac e can be used for data connections to a PC as usual. When the built-in MHL transmitter chip recognizes an MHL-capable receiver at the other end, it switches into the MHL transmit mode. The MHL transmitter then sends the AV data over two of the fi ve pins on the micro USB port. The control signals are transmitted via one of the other pins. The 5 V line is used to charge the mobile device while transmitting.
Key features of MHL: ❙ HD video and digital audio: 1080p/60 video and up to 192 kHz 7.1 surround audio ❙ Utilization of existing connectors ❙ Low pin-count interface: HD video and digital audio over a 5-pin interface which includes control and power ❙ Provision of power to the mobile device: 5 V and 900 mA ❙ Content protection: full support of high-bandwidth digital content protection (HDCP)
Supported video formatsIndex Mode Refresh1 640×480 (VGA) 59.94/602,3 720×480p 59.94/6017,18 720×576p 504 1280×720p 59.94/6019 1280×720p 505 1920×1080i 59.94/6020 1920×1080i 5016 1920×1080p 59.94/6031 1920×1080p 5034 1920×1080p 306,7 720 (1440)×480i 59.94/6021,22 720 (1440)×576i 50
Glossary:CBUS = MHL link control bus, DVI = digital visual interface, E-EDID = enhanced extended display identifi cation data, GND = ground, HD = high defi ntion, HDCP = high- bandwidth digital content protection, HDMI = high defi nition multimedia interface, MHL = mobile high-defi nition link, MSC = MHL sideband channel, RAP = request action protocol, RCP = remote control protocol, SD = standard defi nition, TMDS = transition-minimized differential signaling, UCP = UTS-8 character protocol, USB = universal serial bus, VBUS = MHL voltage busSources: MHL Specifi cation
Rohde & Schwarz as a valued partner of consumer electronics manufacturers offers test and measurement solutions for MHL.
Rohde & Schwarz solutions for MHL
MHL link control bus (CBUS) MHL voltage bus (VBUS)
The point-to-point single-wire CBUS provides the following functionality: ❙ A mechanism allowing source and sink devices to detect connectivity to an MHL-compliant sink and source device, respectively ❙ A communications channel for DDC commands that is used by an MHL source device to determine the capabilities and characteristics of the sink device by reading the EDID data structure
❙ A communications channel for DDC commands that is used by an MHL source device to initiate all register reads and writes required for content protection
❙ An MHL sideband channel (MSC) is provided for higher-level user functions such as automatic setup tasks or tasks typically associated with infrared remote control usage: remote control protocol (RCP), UTS-8 character protocol (UCP), request action protocol (RAP)
The CBUS has suffi cient headroom to be used for other protocols in the future.
The VBUS provides a minimum of 5 V/900 mA power between sink (e.g. TV) and source (e.g. mobile phone).
TMDS is used to carry all audio and video data as well as auxiliary data (such as InfoFrame packets) that describes the active audio and video streams. The bit stream is modulated by a clock signal. In 24-bit mode, MHL uses a single differential channel to transmit TMDS data that, for example, is carried over three different channels in DVI. The incoming three-channel data needs to be packed into one TMDS channel at the TX end and unpacked into three channels at the RX end. There is one TMDS encoder at the TX end and one TMDS decoder at the RX end. TX data is multiplexed into a single lane prior to being encoded. RX data is decoded prior to being demultiplexed into three lanes. In PackedPixel mode, only two channels are multiplexed: channel 0 and channel 1. One clock period of the MHL clock equals two periods of the pixel clock. Each period of the MHL clock transmits four TMDS characters.
3D video modesIndex Mode Refresh 3D mode4 1280×720p 59.94/60 top-bottom
frame sequential
19 1280×720p 50 top-bottomframe sequential
5 1920×1080i 59.94/60 left-right20 1920×1080i 50 left-right32 1920×1080p 24 top-bottom
frame sequential
TMDS protocol video and audio formats
TMDS channel
24 bit per pixel are transferred
16 bit per pixel are transferred
Interfaces and pin assignment
24-bit mode
PackedPixel mode
Link
Link
Link
¸VTS compact video tester ¸VTC video test center¸VTE video tester
Pixel encodingYCbCr 4:2:2YCbCr 4:4:4RGB 4:4:4
Audio formatsL-PCM 8 channel audioChannel assignment in line with CEA-861ESupported audio sample rates32 kHz 48 kHz44.1 kHz 96 kHz88.2 kHz 192 kHz176.4 kHz
Supported color spacesSD: ITU-R Rec. BT.601HD: ITU-R BT.709-5Additional: xvYCC, sYCC601, AdobeYCC601, AdobeRGB
MHL_po_en_folded_3606-6792-82_v0400.indd 1MHL_po_en_folded_3606-6792-82_v0400.indd 1 15.07.2013 11:52:5815.07.2013 11:52:58
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MH
L (Mobile H
igh-defi nition Link) Technical O
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Mic
ro U
SB
Tran
smitt
er e
nd (T
X en
d) =
sou
rce
Rece
iver
end
(RX
end)
= s
ink
HDM
I typ
e A
3M
HL+
2M
HL–
5GN
D4CB
US1 VB
US
18VB
US 9M
HL–
7M
HL+
19CB
US
GND
17,1
1,5
CBU
S
TMDS
cha
nnel
(MH
L–/M
HL+
)
VBU
S
GND
1x b
uffe
ring
Com
mon
mod
em
odul
aton
MHL
stre
amDa
ta is
land
enco
ding
Encr
yptio
nAu
dio/
vide
oan
d co
ntro
llo
gic
CH0
CH2
Cont
ent
Pixe
l clo
ck
MHL
c
lock
MHL
+/M
HL–
Perio
d co
ntro
l sig
nal
CH2
CH1
CH0
t 2t 1
t 0
3x c
lock
mul
tiplie
r
Vide
o en
codi
ng
Cont
rol p
erio
den
codi
ng
Logi
cal c
hann
els
Phys
ical
cha
nnel
CH1
½x
mul
tiplie
r
Com
mon
mod
em
odul
aton
MHL
stre
amDa
ta is
land
enco
ding
Encr
yptio
nAu
dio/
vide
oan
d co
ntro
llo
gic
CH0
CH1
Cont
ent
Pixe
l clo
ck
MHL
c
lock
Perio
d co
ntro
l sig
nal
CH1
CH0
CH1
t 3t 2
t 1
CH0 t 0
2x c
lock
mul
tiplie
r
Vide
o en
codi
ng
Cont
rol p
erio
den
codi
ng
Logi
cal c
hann
els
Phys
ical
cha
nnel
Com
mon
mod
ede
mod
ulat
onM
HL s
tream
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deco
ding
Decr
yptio
nAu
dio/
vide
o an
d co
ntro
llo
gic
CH0
CH1
CH2
Cont
ent
3x c
lock
mul
tiplie
r
1x b
uffe
ring
Pixe
l clo
ck
MHL
c
lock
Perio
d co
ntro
l sig
nal
CH2
CH1
CH0
t 2t 1
t 0
MHL
+/M
HL–
Com
mon
mod
ede
mod
ulat
onM
HL s
tream
TMDS
deco
ding
Decr
yptio
nAu
dio/
vide
o an
d co
ntro
llo
gic
CH0
CH1
Cont
ent
4x c
lock
mul
tiplie
r
2x m
ultip
lier
Pixe
l clo
ck
MHL
c
lock
MHL
+/M
HL–
Perio
d co
ntro
l sig
nal
CH0
CH1
CH0
t 2t 1
t 0
CH1 t 3
0x00
Mob
ile h
igh
-def
init
ion
lin
k
MH
L is
the
new
lead
ing
mob
ile d
evic
e in
terf
ace
for
tran
smitt
ing
vid
eo a
nd a
udio
. Thi
s in
terf
ace
can
conn
ect
smar
tpho
nes,
tab
let
PC
s an
d vi
deo
cam
eras
with
dis
play
equ
ipm
ent
such
as
TV s
ets,
pro
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and
mon
itors
. MH
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es t
he m
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US
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whi
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alre
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avai
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man
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obile
dev
ices
. The
US
B in
terf
ac e
can
be u
sed
for
data
con
nect
ions
to
a P
C a
s us
ual.
Whe
n th
e bu
ilt-in
MH
L tr
ansm
itter
chi
p re
cog
nize
s an
pins
on
the
mic
ro U
SB
por
t. T
he c
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ol s
igna
ls a
re t
rans
mitt
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ia o
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f th
e ot
her
pins
. The
5 V
line
is u
sed
to c
harg
e th
e m
obile
dev
ice
whi
le
tran
smitt
ing
.
Key
fea
ture
s of
MH
L:
HD
vid
eo a
nd d
igita
l aud
io: 1
080p
/60
vide
o an
d up
to
192
kHz
7.1
surr
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aud
io U
tiliz
atio
n of
exi
stin
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s L
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in-c
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inte
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D v
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and
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ital a
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terf
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whi
ch in
clud
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ontr
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ower
Pro
visi
on o
f po
wer
to
the
mob
ile d
evic
e: 5
V a
nd 9
00 m
A C
onte
nt p
rote
ctio
n: f
ull s
uppo
rt o
f hi
gh-
band
wid
th d
igita
l con
tent
pro
tect
ion
(HD
CP
)
Su
pp
ort
ed v
ideo
form
ats
Ind
exM
od
eR
efre
sh1
640×
480
(VG
A)
59.9
4/60
2,3
720×
480p
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4/60
17,1
872
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6p50
412
80×
720p
59.9
4/60
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80×
720p
505
1920
×10
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59.9
4/60
2019
20×
1080
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1619
20×
1080
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6031
1920
×10
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5034
1920
×10
80p
306,
772
0 (1
440)
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6021
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720
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Glo
ssar
y: MH
L lin
k co
ntro
l bus
, d
igita
l vis
ual i
nter
face
, g
roun
d,
mob
ile h
igh-
MH
L si
deba
nd c
hann
el,
req
uest
act
ion
prot
ocol
, r
emot
e co
ntro
l pro
toco
l, U
TS-8
cha
ract
er p
roto
col,
uni
vers
al s
eria
l bus
, M
HL
volta
ge
bus
Roh
de &
Sch
war
z as
a v
alue
d pa
rtne
r of
con
sum
er e
lect
roni
cs m
anuf
actu
rers
off
ers
test
and
mea
sure
men
t
solu
tions
for
MH
L.
MH
L lin
k c
on
trol b
us
(CB
US
)M
HL v
olt
age
bu
s (V
BU
S)
The
poin
t-to
-poi
nt s
ing
le-w
ire C
BU
S p
rovi
des
the
follo
win
g f
unct
iona
lity:
A m
echa
nism
allo
win
g s
ourc
e an
d si
nk d
evic
es t
o de
tect
con
nect
ivity
to
an M
HL-
com
plia
nt s
ink
and
sour
ce d
evic
e, r
espe
ctiv
ely
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omm
unic
atio
ns c
hann
el f
or D
DC
com
man
ds t
hat
is u
sed
by a
n M
HL
sour
ce d
evic
e to
det
erm
ine
the
capa
bilit
ies
and
char
acte
ristic
s of
the
sin
k de
vice
by
read
ing
the
ED
ID d
ata
stru
ctur
e A
com
mun
icat
ions
cha
nnel
for
DD
C c
omm
ands
tha
t is
use
d by
an
MH
L so
urce
dev
ice
to in
itiat
e al
l reg
iste
r re
ads
and
writ
es
requ
ired
for
cont
ent
prot
ectio
n A
n M
HL
side
band
cha
nnel
(MS
C) i
s pr
ovid
ed f
or h
ighe
r-le
vel u
ser
func
tions
suc
h as
aut
omat
ic s
etup
tas
ks o
r ta
sks
typi
cally
ass
ocia
ted
with
in
frar
ed r
emot
e co
ntro
l usa
ge:
rem
ote
cont
rol p
roto
col (
RC
P),
UTS
-8 c
hara
cter
pro
toco
l (U
CP
), re
ques
t ac
tion
prot
ocol
(RA
P)
The
VB
US
pro
vide
s up
to
5 V
/900
mA
pow
er b
etw
een
sink
(e.g
. TV
) and
sou
rce
(e.g
. mob
ile p
hone
).
TMD
S is
use
d to
car
ry a
ll au
dio
and
vide
o da
ta a
s w
ell a
s au
xilia
ry d
ata
(suc
h as
Info
Fram
e pa
cket
s) t
hat
desc
ribes
th
e ac
tive
audi
o an
d vi
deo
stre
ams.
The
bit
stre
am is
mod
ulat
ed b
y a
cloc
k si
gna
l. In
24-
bit
mod
e, M
HL
uses
a
sing
le d
iffer
entia
l cha
nnel
to
tran
smit
TMD
S d
ata
that
, for
exa
mpl
e, is
car
ried
over
thr
ee d
iffer
ent
chan
nels
in D
VI.
The
inco
min
g t
hree
-cha
nnel
dat
a ne
eds
to b
e pa
cked
into
one
TM
DS
cha
nnel
at
the
TX e
nd a
nd u
npac
ked
into
thr
ee
chan
nels
at
the
RX
end
. The
re is
one
TM
DS
enc
oder
at
the
TX e
nd a
nd o
ne T
MD
S d
ecod
er a
t th
e R
X e
nd. T
X d
ata
is m
ultip
lexe
d in
to a
sin
gle
lane
prio
r to
bei
ng e
ncod
ed. R
X d
ata
is d
ecod
ed p
rior
to b
eing
dem
ultip
lexe
d in
to t
hree
la
nes.
In P
acke
dPix
el m
ode,
onl
y tw
o ch
anne
ls a
re m
ultip
lexe
d: c
hann
el 0
and
cha
nnel
1. O
ne c
lock
per
iod
of t
he
MH
L cl
ock
equa
ls t
wo
perio
ds o
f th
e pi
xel c
lock
. Eac
h pe
riod
of t
he M
HL
cloc
k tr
ansm
its f
our
TMD
S c
hara
cter
s.
3D
vid
eo m
od
esIn
dex
Mod
eR
efre
sh3D
mod
e4
1280
×72
0p59
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60to
p-bo
ttom
fram
e se
quen
tial
1912
80×
720p
50to
p-bo
ttom
fram
e se
quen
tial
519
20×
1080
i59
.94/
60le
ft-r
ight
2019
20×
1080
i50
left
-rig
ht32
1920
×10
80p
24to
p-bo
ttom
fram
e se
quen
tial
TM
DS
pro
toco
l vi
deo
an
d a
ud
io f
orm
ats
TM
DS
ch
ann
el
24 b
it pe
r pi
xel a
re t
rans
ferr
ed
16 b
it pe
r pi
xel a
re t
rans
ferr
ed
Inte
rfac
es a
nd
pin
ass
ign
men
t
24-b
it m
od
e
Pac
ked
Pix
el m
od
e
Lin
k
Lin
k
Lin
k
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TS c
ompa
ct v
ideo
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ter
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ideo
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ideo
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ter
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el e
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CbC
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GB
4:4
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Au
dio
form
ats
L-P
CM
8 c
hann
el a
udio
Cha
nnel
ass
ignm
ent
in li
ne w
ith C
EA
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ES
up
port
ed a
ud
io s
amp
le r
ates
32 k
Hz
48 k
Hz
44.1
kH
z96
kH
z88
.2 k
Hz
192
kHz
176.
4 kH
z
Su
pp
ort
ed c
olo
r sp
aces
SD
: ITU
-R R
ec. B
T.60
1H
D: I
TU-R
BT.
709-
5A
dditi
onal
: xvY
CC
, sY
CC
601,
A
dobe
YC
C60
1, A
dobe
RG
B
MHL
(Mob
ile
high
-def
initi
on li
nk)
Tech
nica
l ove
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MHL_po_en_folded_3606-6792-82_v0400.indd 2MHL_po_en_folded_3606-6792-82_v0400.indd 2 15.07.2013 11:53:1115.07.2013 11:53:11