ICs for Communications
Advanced CMOS Frame Aligner
ACFA
PEB 2035
Data Sheet 01.94
PEB 2035
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Edition 01.94
Published by Siemens AG,
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Kommunikation, Balanstraße 73,
81541 München
©
Siemens AG 1994.
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Critical components
1
of the Semiconductor Group of Siemens AG, may only be used in life-support devices or systems
2
with the express
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1 A critical component is a component used in a life-support device or system whose failure can reasonably be expected to cause the
failure of that life-support device or system, or to affect its safety or effectiveness of that device or system.
2 Life support devices or systems are intended (a) to be implanted in the human body, or (b) to support and/or maintain and sustain hu-
man life. If they fail, it is reasonable to assume that the health of the user may be endangered.
General Information
Table of Contents
Page
1
1.1
1.2
1.3
2
3
4
5
6
6.1
7
8
9
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Pin Configurations (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Pin Definitions and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
System Integration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Operational Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
Detailed Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
Register Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .119
Package Outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .130
Annex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132
Semiconductor Group
3
Advanced CMOS Frame Aligner (ACFA)
PEB 2035
CMOS IC
1
Features
Serial Interface to Line Interface Unit
q
Frame alignment/synthesis for 2048 kbit/s (CEPT,
q
q
q
q
q
q
q
q
PCM 30) and 1544 kbit/s (T1, PCM 24)
Meets newest CCITT Rec’s (Blue Book), FTZ Rec’s and
AT&T technical advisories (DMI, August 1986)
Programmable formats for
PCM 30: Doubleframe, CRC Multiframe
PCM 24: 4-Frame Multiframe (F4), 12-Frame Multiframe
(F12, D3/4), Extended Superframe (ESF), Remote Switch
Mode (F72)
Selectable conditions for loss of sync
Selectable line codes (HDB3, B8ZS, AMI with ZCS)
Unipolar NRZ for interfacing fibre optical transmission
routes
Error checking via CRC4 or CRC6 procedures
Insertion and extraction of alarms and facility signaling
IDLE code insertion for selectable channels
P-LCC-44
P-DIP-40
Serial Interface to System Internal Highway
q
System clock frequency of either 4096 kHz or 8192 kHz
q
Selectable 2048/4096 kbit/s system internal highway with programmable receive/transmit shifts
q
Two-frame deep elastic receive memory for receive route clock wander and jitter compensation
q
q
q
q
q
q
(can be reduced to one-frame length for PCM 30 master-slave applications)
One frame elastic transmit memory (PCM 24 mode only) for transmit route clock wander and
jitter compensation
Two different time-slot assignment procedures in PCM 24 mode
Support for different signaling schemes
Channel loop back capabilities
Channel parity error monitoring
Clear channel capabilities in PCM 24 mode
Type
PEB 2035-N
PEB 2035-P
Version
V4.1
V4.1
Ordering Code
Q67100-H6289
Q67100-H6290
Package
P-LCC-44 (SMD)
P-DIP-40
Semiconductor Group
4
01.94
PEB 2035
Microprocessor Interface
q
Parallel, demultiplexed microprocessor interface for random access to control and status
registers
q
Alarm interrupt capabilities
q
Access to different signaling information:
– S
a
-, E, S
i
-bits (register)
– S
a
-bits (5-byte stack)
– FDL bits with the possibility of mixed insertion
– CCS, CAS-CC (common channel), CAS-BR (bit robbing) via 2/3-byte stacks with DMA/
interrupt support
q
Extensive test and diagnostic capabilities
General
q
Advanced CMOS technology
q
Low power consumption (< 100 mW)
q
Packaging: P-DIP-40, P-LCC-44
1.1
Introduction
The Advanced CMOS Frame Aligner PEB 2035 (ACFA) is a monolithic CMOS device which
implements the interface to primary rate PCM carriers. It may be programmed to operate in 24-
channel (T1) and 32-channel (CEPT) carrier systems.
The ACFA features include: selectable multiframe (six multiframe formats), error checking (CRC4,
CRC6), multiple line codes (HDB3, B8ZS, AMI), and programmable signaling paths. The device
includes functions which meet newest CCITT (Blue Book) and FTZ recommendations for primary
rate interfaces and the AT&T Digital Multiplexed Interface specifications (DMI) plus some additional
features requested by the market. Controlling and monitoring of the device is performed via a
parallel eight-bit microprocessor bus.
The circuit contains a two-frame elastic memory which ensures wander absorption between the
PCM carrier and a synchronous, system internal highway.
All signaling types - CCS, CAS and bit-robbed signaling in conjunction with Clear Channel
Capability - are supported by the ACFA. In addition, the ACFA allows flexible access to facility data
link and service channels. Extensive testing capabilities are included.
The ACFA is suitable for a wide range of voice and data applications. Below you find a list of
equipment as described by the CCITT which potential ACFA applications.
2048 kbit/s Applications
– PCM Multiplex equipment according to G.732, G.735, G.738.
– Digital Multiplex equipment according to G.736
– Digital Multiplex equipment according G.742, G745
– External Access equipment according to G.737, G.739
– Digital Exchange equipment according to G.705, Q.511, Q512
– Transmultiplex equipment according to G.793
Semiconductor Group
5
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