MT90222/3/4
4/8/16 Port IMA/TC PHY Device
Data Sheet
Features
IMA
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Up to 16 T1, E1, J1, DSL links & up to 8 IMA
groups with 1 to 16 links/IMA group
1
Supports symmetrical & asymmetrical operation
CTC (common transmit) & ITC (independent
transmit) clocking modes
Pre-processing of RX ICP (IMA control protocol)
cells
IMA layer & per link statistics and alarms for
performance monitoring with MIB support
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Ordering Information
MT90222AG
384 Pin PBGA Trays
MT90223AG
384 Pin PBGA Trays
MT90224AG
384 Pin PBGA Trays
MT90222AG2 384 Pin PBGA** Trays, Bake & Drypack
MT90223AG2 384 Pin PBGA** Trays
MT90224AG2 384 Pin PBGA** Trays
**Pb Free Tin/Silver/Copper
-40°C to +85°C
April 2006
HEC (header error control) verification &
generation, error detection, filler cell filtering (IMA
mode) and idle/unassigned cell filtering (TC
mode)
TC layer statistics and error counts i.e. HEC
errors with MIB support
TC and UNI
•
Supports mixed-mode operation: links not
assigned to an IMA group can be used in TC
mode
ATM framing using cell delineation
Standards Compliant
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ATM Forum - IMA 1.1 (AF-PHY-0086.001) &
backwards compatible with IMA 1.0
ATM Forum - ATM over Fractional T1/E1 (AF-
PHY-0130.00)
ITU G.804 cell mapping & ITU I.432 cell
delineation
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1. MT90222 supports up to 4 serial links with maximum 4 groups
to be used - groups 0,1,2,3.
MT90223 supports up to 8 serial links
MT90224 supports up to 16 serial links
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RX External Static RAM
TDM Ring
RX
Utopia
Level 2
BUS
TX
Rx Utopia
FIFo
Internal IMA
Processors
(1 per group)
TDM
Ring
Control
S/P
T1/E1/DSL
Utopia
I/F CTRL
Cell
Delineator
CD Circuits (1 per link)
T1/E1/DSL
P/S
Tx Utopia
FIFo
Transmission
Convergence
TDM
Ring
Control
T1/E1/DSL
Serial TDM Ports
(1 per link, up to 10Mb/s
per link)
TC Circuits (1 per link)
Processor I/F
TDM Ring
Figure 1 - MT90222/3/4 Block Diagram (with Built-in IMA functions for up to 8 IMA Groups over
4/8/16 links)
1
Zarlink Semiconductor Inc.
Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.
Copyright 2004-2006, Zarlink Semiconductor Inc. All Rights Reserved.
MT90222/3/4
General
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Supports unframed serial streams up to 10 Mb/s per T1/E1 or DSL link
Single chip ATM IMA & TC processor
Versatile TDM interface for most popular T1 or E1 framers and DSL chipsets
Up to 6 MT90222/3/4 devices can be spanned using a TDM ring supporting 32 links
Data Sheet
Provides 8 & 16-bit UTOPIA Level 1 & 2 compatible MPHY Interface (MT90222/3/4 slaved to ATM device)
16-bit microprocessor interface for Intel or Motorola
JTAG test support
2.5 V core, 3.3 V I/O with 5 V tolerant inputs
384 pin PGBA with 1.0 mm pitch balls
MT90222, MT90223 & MT90224 share the same product package and pin-out configuration
Applications
Provides cost effective solutions to implement IMA and/or TC functions over T1, E1, J1 or DSL transport facilities in
broadband access networks. Typical applications are for trunking or subscriber access in:
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Integrated multi-service access platforms
Access multiplexers
Next-generation DLC
Wireless local loop
3G wireless base-stations
Preamble
The MT90222, MT90223 and MT90224 form a family of similar devices, differing mainly in the maximum number of
serial links, and are collectively referred to as MT90222/3/4. It should be noted throughout this document whenever
reference is made to the number of serial links that the MT90224 offers a maximum of 16 serial links (links 15:0),
while the MT90223 offers a maximum of 8 serial links (links 14,12,10,8,6,4,2 and 0), and the MT90222 offers a
maximum of 4 serial links (links 12, 8, 4 and 0). Pin and register compatibility has been maintained to offer
interchangeability.
Note:
When creating IMA groups for MT90222 the groups 0, 1, 2 and 3 should be used.
Description
The MT90222/3/4 device is targeted to systems implementing the ATM FORUM Inverse Multiplexing for ATM (IMA
version 1.1 and 1.0) or UNI specifications for T1/E1 rates. In the MT90222/3/4 architecture, up to 16 physical and
independent serial links can be terminated through the utilization of off-the-shelf, traditional T1/E1/J1 framers/LIUs
and DSL chip sets. The MT90222/3/4 device can also provide up to 10 Mb/s per link data rates for unframed serial
TDM transmissions for xDSL applications.
The MT90222/3/4 device provides ATM system designers with a flexible architecture when implementing ATM
access over existing trunk interfaces, allowing a migration towards ATM service technology. In addition to the
design of ATM UNI specifications for T1/E1 rates, the MT90222/3/4 device is compliant with the ATM FORUM IMA
specifications for controlling IMA groups of up to 16 trunks in a single chip. The MT90222/3/4 can be configured to
operate in different modes to facilitate the implementation of the IMA function at both CPE and Central Office sites.
For systems targeting ATM over T1/E1 with IMA and TC operating simultaneously, the MT90222/3/4 device
provides the ideal architecture and capabilities.
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Zarlink Semiconductor Inc.
MT90222/3/4
The device provides up to 8 internal IMA processors and allows for bandwidth scaleability.
Data Sheet
The implementation of IMA as per AF-PHY-0086.001 Inverse Multiplexing for ATM (IMA) Specification Version 1.1
is divided into hardware and software functions. Hardware functions are implemented in the MT90222/3/4 device
and software functions are implemented by the IMA Core (Zarlink or user) software. Additional hardware functions
are included to assist in the collection of statistical information to support MIB implementation.
Hardware functions that are implemented in the MT90222/3/4 device are:
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Utopia Level 1 or 2 compatible MPHY Interface
Incoming HEC verification and correction (optional)
Generation of a new HEC byte
Format outgoing bytes into multi-vendor TDM formats
Retrieve ATM Cells from the incoming multi-vendor TDM format
Perform cell delineation
Cell pre-processing
Provide various counters to assist in performance monitoring
TDM expansion ring to span multiple devices
Hardware functions that are implemented by the IMA processor in the MT90222/3/4 device are:
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Transmit scheduler (one per IMA group)
Generation of the TX IMA Data Cell Rate clock
Generation and insertion of ICP cells, Filler Cells and Stuff Cells in IMA mode and Idle Cells in TC mode; the
ICP cells are programmed by the user and the Filler and Idle cells are pre-defined
Perform IMA Frame synchronization
Retrieve and process Rx ICP cells in IMA Mode
Management of RX links to be part of the internal re-sequencer when active
Extraction of RX IMA Data Cell Rate clock
Verification of delays between links
Perform re-sequencing of ATM cells using external asynchronous Static RAM
Can accommodate more than 200 msec of link differential delay depending on the amount of external
memory
Provide structured Interrupt scheme to report various events
3
Zarlink Semiconductor Inc.
MT90222/3/4
Table of Contents
Data Sheet
1.0 Device Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
1.1 Software Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
1.1.1 Link State Machines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
1.1.2 IMA Group State Machines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
1.1.3 Link Addition, Removal or Restoration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
1.1.4 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
1.1.5 Signalling and Rate Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
1.1.6 Performance Monitoring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
1.2 Hardware Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
2.0 The ATM Transmit Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
2.1 Cell In Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
2.2 The ATM Transmission Convergence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2.2.1 TX Cell RAM and TX FIFO Length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
2.3 Parallel to Serial TDM Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
2.4 ATM Transmit Path in IMA Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
2.4.1 IMA Frame Length (M) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
2.4.2 Position of the ICP Cell in the IMA Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
2.4.3 Transmit Clock Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
2.4.4 Stuff Cell Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
2.4.5 IMA Data Cell Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
2.4.6 IMA Controller (RoundRobin Scheduler) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2.4.7 ICP Cell Generator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
2.4.8 IMA Frame Programmable Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
2.4.9 Filler Cell Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
2.4.10 TX IMA Group Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
2.4.11 TX Link Addition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
2.4.12 TX Link Deletion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
2.5 ATM Transmit Path in TC Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.0 The ATM Receive Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.1 Cell Delineation Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.1.1 Cell Delineation with Sync signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
3.1.2 Cell Delineation without Sync signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
3.1.3 De-Scrambling and ATM Cell Filtering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
3.2 ATM Receive Path in IMA Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
3.2.1 ICP Cell Processor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
3.2.2 IMA Frame Synchronization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
3.2.3 Link Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
3.2.4 RX OAM Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
3.2.5 Out of IMA Frame (OIF) Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
3.2.6 Loss of IMA Frame (LIF) Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.2.7 Filler Cell Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.2.8 Stuff Cell Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.2.9 Received ICP Cell Buffer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.2.10 Rate Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
3.2.11 Cell Buffer/RAM Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
3.2.12 Cell Sequence Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3.2.13 Delay Between Links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3.2.13.1 RX Recombiner Delay Value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
3.2.13.2 RX Maximum Operational Delay Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
3.2.13.3 Link Out of Delay Synchronization (LODS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
3.2.13.4 Negative Delay Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
3.2.13.5 Measured Delay Between Links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
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Zarlink Semiconductor Inc.
MT90222/3/4
Table of Contents
Data Sheet
3.2.13.6 Incrementing/Decrementing the Recombiner Delay. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
3.2.14 RX IMA Group Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
3.2.15 Link Addition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
3.2.16 Link Deletion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
3.2.17 Disabling an IMA Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
3.3 The ATM Receive Path in TC Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
4.0 Description of the TDM Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
4.1 Single Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
4.1.1 Single Mode - Generic 1.544 MHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
4.1.2 Single mode - Generic 2.048 MHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
4.1.3 Single Mode -ST-BUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
4.2 Wire-OR Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
4.2.1 Wire-OR Mode - 2 Link Grouping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
4.2.2 Wire-OR Mode - 4 Link Grouping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
4.3 Multiplex Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
4.3.1 Multiplex Mode - 2 Link Multiplexing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
4.3.2 Multiplex Mode - 4 Link Multiplexing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
4.4 Non-Framed Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
4.4.1 Non-Framed Mode - 2.5 Mbps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
4.4.2 Non-Framed Mode - 5.0 Mbps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
4.4.3 Non-Framed Mode - 10.0 Mbps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
4.5 Clock formats. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
4.6 TDM Loopback Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
4.7 Serial to Parallel (S/P) and Parallel to Serial (P/S) Converters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
4.8 Clocking Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
4.8.1 Verification of the RXSYNC Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
4.8.2 Verification of the TXSYNC Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
4.8.3 Primary and Secondary Reference Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
4.8.4 Verification of Clock Activity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
4.8.5 Clock Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
5.0 UTOPIA Interface Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
5.1 ATM Input Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
5.2 ATM Output Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
5.3 UTOPIA Operation with a Single PHY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
5.4 UTOPIA Operation with Multiple PHY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
5.5 UTOPIA Operation in TC Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
5.6 UTOPIA Operation in IMA Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
5.7 UTOPIA Loopback. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
5.8 Examples of UTOPIA Operations Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
6.0 Support Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
6.1 Counter Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
6.1.1 UTOPIA Input I/F counters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
6.1.2 Transmit TDM I/F Counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
6.1.3 Receive TDM I/F Counters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
6.1.4 Access to the Counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
6.1.5 Latching counter mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
6.2 Interrupt Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
6.2.1 IRQ Master Status and IRQ Master Enable Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
6.2.2 IRQ Link Status and IRQ Link Enable Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
6.2.2.1 Bit 8 and 7 of IRQ Link 0 Status and IRQ Link 0 Enable Registers. . . . . . . . . . . . . . . . . . . . 70
6.2.3 IRQ Link TC Overflow Status Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
6.2.4 IRQ IMA Group Overflow Status and Enable Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
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