PEB2085 SIEMENS [Siemens Semiconductor Group], PEB2085 Datasheet - Page 31

• Manufacturer Part Number: PEB2085
• Description: ISDN SubscribernAccess Controller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

2
2.1
The functional block diagram of the ISAC-S is shown in figure 10.
The left-hand side of the diagram contains the layer-1 functions, according to CCITT I series
recommendations:
– S-bus transmitter and receiver
– timing recovery and synchronization by means of digital PLL circuitry
– activation/deactivation
– access to S and Q channels
– handling of D channel
– test loops
– send single/continuous AMI pulses (diagnostics).
Figure 10
Architecture of the ISAC
Semiconductor Group
*
XTAL1
XTAL2
V
*
SR2
SR1
SX1
SX2
UFI
SSA
X0, X1, X2
*
Only PEB 2085
*
Functional Description
General Functions and Device Architecture
CP/BCL
AMI
AMI
DPLL
BIN
Access
BIN
D-CH
DCL
M1
Buffer
Buffer
®
-S
M0
Control
FSC1
IDP1 IDP0
Interface
Timing
FSC2
IOM
R
31
SDS2
SCA/
FSD/
HDLC
Receiver
AD0-AD7/
A0-A5&
D0-D7
R-FIFO
HDLC
Transmitter
P-Interface
X-FIFO
Control
Functional Description
LAPD
Controller
Status
Command
Register
FIFO
Controller
INT
SLD Port
SSI Port
ITB00850
V
V
SDAR
SIP/EAW
RST
DD
SSD
SDAX/
SDS1