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ST5451D 数据表(PDF) 11 Page - STMicroelectronics

部件名 ST5451D
功能描述  ISDN HDLC AND GCI CONTROLLER
Download  34 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST5451D 数据表(HTML) 11 Page - STMicroelectronics

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CD
Configuration Register D
After reset 00
Content of CD indicate TEI z value.
7 High Order Bits
TEI
0
CE
Configuration Register E
After reset 00
Content of CE indicate TEI t value.
7 High Order Bits
TEI
0
CF
Configuration Register F
After 00
TE MAS/SSC CCS CMS/SC PI VZDOUT MDS1 MDS0
TE
TE mode
TE = 1 : the frame is constitued by
three GCI channels (GCI-SCIT)
MAS/SSC If CCS = 0, TE = 1, MDS0 and MDS1 = 1
(i.e. GCI mode, TE mode, 16 Kbit/s)
MAS/SSc is MAS and:
MAS = 0 means ”Slave device”
MAS = 1 means ”Master device”
If SC = 1 (i.e. a sub-channel is se-
lected) MAS/SSC is SSC; if 16Kb is se-
lected SSC chooses between first on
second bit of the stream while, if 64Kb
is selected SSC chooses between first
or last seven bits of the stream (see
TABLE 2 and CMS/SC)
CCS
Channel Capacity Selection
CCS = 1: 64 Kb/s
CCS = 0: 16 Kb/s.
CMS/SC If CCS = 0, TE = 1, MDS0 and MDS1 = 1
(i.e. GCI mode, TE mode, 16Kbit/s)
CMS/SC is CMS (Contention mode se-
lection) and:
CMS = 1 means ”D and C/I channel
access procedure active”
CMS = 0 means ”D and C/Z channel
access procedure active”
If CCS = 1 and TE = 1 CMS/SC is SC
(Subchannel) and:
SC = 0 means ”16Kbit/s or 64Kbit/s is
used”
SC = 1 means ”an 8Kbit/s or 56Kbit/s
subchannel inside a 16Kbit/s or
64kbit/sis used” (see MAS/SSC)
PI
Peripheral Interface (only if TE=1)
PI = 1: CIX2, CIR2, MONX2, MONR2,
active
VZDOUT When level 1 device is inactive (i.e.
CIR1 = DI = 1111) and GCI has to be
waken up (i.e. TIM = 0000 in CIX1),
DOUT is set to zero requiring
FS
and
CLK
if VZ DOUT=1.
MDS1
Mode Bit 1
MDS1 = 1:GCI mode
MDS1 = 0: Multiplexed mode
MDS0
Mode Bit 0
MDS0 = 1: Multiplexer and Demulti-
plexer are active.
MDS=0 No multiplexer.
CCR
Configuration Register 00
After reset 00
TLP ADDR AD3
AD2
AD1
AD0
CRS
TRI
TLP
Test Loop
TLP = 1: The transmitter is internally
connected to the receiver; the transmit
output is not activated. The digital inter-
face must be activated to provide the
bit clock and frame Synchro.
ADDR
Address Recognized
If TE = 1 and PI = 1
ADDR = 1: The first byte received in
MONR2 is compared with AD0/3. If
equal the message is accepted, other-
wise is ignored.
ADDR = 0: The message is always ac-
cepted.
AD0/3
When PI = 1, is the component ad-
dress.
AD0/2
Address bit used to access D and C/I
channels (TE = CMS =1, CCS = 0).
CRS
Clock Rate Selection
CRS = 1: Clock frequency is twice the
data rate (GCI).
CRS = 0: Clock frequency and data
rate are identical.
TRI
Tristate
TRI = 1: DOUT in tristate
TRI = 0: DOUT in open drain.
ST5451
11/34


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