MT90840

Preliminary Information

 

 

Serial Input

TPDM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Channel

Address

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

STi0, Ch0

 

000H

 

 

CPU Port Addressing:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

STi0, Ch1

 

001H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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CAR

 

Address Bus

 

 

 

 

 

 

.

 

 

 

 

 

1

0

 

 

6

5

 

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

STi3, Ch126

1FEH

 

Stream

 

 

 

Channel

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

STi4, Ch127

1FFH

 

 

TPCM Contents:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

7

 

 

6

5

 

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Stream

 

 

Channel

 

 

 

 

 

 

 

 

 

 

 

 

 

Bits 8:7 select one of 8 streams.

 

 

 

 

 

 

 

 

Bits 6:0 select one of 128

 

 

 

 

 

 

 

 

channels per stream.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 14a - 8.192 Mbps TPDM Addressing

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Serial Output

RPCM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Channel

Address

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

STo0, Ch0

 

000H

 

 

CPU Port Addressing:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

STo0, Ch1

 

001H

 

CAR

 

Address Bus

 

 

 

 

 

 

.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

.

 

 

 

 

 

1

0

 

 

6

5

 

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Stream

 

 

 

 

 

 

 

 

 

 

 

 

 

STo3, Ch126

1FEH

 

 

 

 

 

Channel

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

STo4, Ch127

1FFH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 14b - 8.196 Mbps RPCM Addressing

Microprocessor Port

An 8-bit multiplexed parallel microprocessor port is provided on the MT90840 to allow an attached CPU to configure and read internal registers and memories. The MT90840 CPU interface is compatible with Motorola, National and Intel Multiplexed Bus CPUs and adapts itself to the appropriate bus-type control signal timing without any mode selection.

The MT90840 CPU interface signals are AD0-7 (Data and Address), ALE/AS, DS/RD, R/W\WR, CS and DTA. The parallel microprocessor interface provides the CPU with access to the internal configuration registers, and the Connection and Data Memories for both the transmit and receive paths. Connection memories are read/write, Data Memories are read only, and the control register senses are shown in Table 2.

Accesses from the microport to the Connection and Data Memories are multiplexed with accesses from the input and output TDM ports. This can cause variable data acknowledge delays which are communicated to the CPU by the DTA output signal.

Note that if the parallel port clocks PCKR & PCKT or serial port clocks C4/8R1 & C4/8R2 are not present during an internal memory access, the DTA output signal may be held HIGH until the clocks are applied again.

For complete details on the Microprocessor Interface timing signals, refer to the AC Electrical Characteristics section.

Address Mapping of the Internal Registers

The MT90840 provides internal registers which are used by the CPU to configure the device in the various operation modes. The IMS, TIM, GPM and ALS Registers should be initialized by the CPU on every system power-up before any internal memory access is performed. In the MT90840, the AD7 address pin must be kept LOW when addressing the internal registers, as depicted in Table 2.

When input address pin AD7 is HIGH, input address pins AD0-AD6 are used together with bits HA7-HA11 in the Control Register to form a 12-bit address to access the MT90840 internal memory selected by the SEL2-SEL0 bits. See Internal Memory Description for memory address mapping.

IRQ Interrupt Pin

The MT90840 provides the output pin IRQ (Interrupt Request) which is active HIGH and indicates the occurrence of one or more error conditions in the MT90840 timing operations. The occurrences are indicated by bits PPCE, RXPAA, TXPAA and FSA in the ALS Register.

Except for cases where the indications are masked by the MSK3-0 bits in the ALS Register, the occurrence of any indication causes an IRQ interrupt to be generated to the CPU. When an interrupt is masked by MSK3-0 bits, the IRQ output will not be activated. However, the interrupt indication will still be provided in the ALS bits.

To cause the IRQ output signal or the indication bits to return to LOW again, the CPU can write any value to the ALS Register (normally the Mask bits are re-written to clear the IRQ pin).

DTA Data Transfer Acknowledgment Pin

The DTA pin is driven LOW by internal logic, to indicate to the CPU that a data bus transfer is complete. When the bus cycle ends, this pin drives HIGH and then switches to high-impedance. If a

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Mitel MT90840 manual Microprocessor Port, Address Mapping of the Internal Registers, IRQ Interrupt Pin

MT90840 specifications

The Mitel MT90840 is an advanced telecommunications device designed to enhance connectivity and communication capabilities for various applications. With its robust array of features and technologies, the MT90840 is well-suited for businesses looking to improve their communications infrastructure.

One of the standout features of the Mitel MT90840 is its integration of voice and data services. This allows users to manage their communications more efficiently, streamlining operations and reducing costs. The device supports a wide range of voice codecs, ensuring high-quality audio during calls and providing flexibility for users who may require different standards for different applications.

Another key characteristic of the MT90840 is its scalability. The device is designed to grow with the needs of a business. It supports multiple lines and can be configured to handle an increasing number of users without compromising performance. This scalability is particularly advantageous for organizations that may undergo growth or changes in their communication needs over time.

The Mitel MT90840 also incorporates advanced networking technologies, such as VoIP (Voice over Internet Protocol). This allows users to make voice calls using the internet rather than traditional phone lines, reducing costs for long-distance calls and improving overall communication efficiency. The device is equipped with features that support secure, encrypted communication, further protecting sensitive data and conversations from potential breaches.

Additionally, the MT90840 is designed with user-friendliness in mind. It features an intuitive interface that simplifies operation, making it accessible even for those who may not be tech-savvy. The device is compatible with various peripherals, such as headsets and conferencing equipment, further enhancing its usability in diverse settings, from small offices to large conference rooms.

Moreover, the Mitel MT90840 offers excellent interoperability with a variety of third-party applications. This flexibility enables organizations to integrate the device into their existing systems seamlessly, thereby enhancing productivity without requiring a complete technological overhaul.

In conclusion, the Mitel MT90840 stands out as a versatile and reliable telecommunications solution. Its rich feature set, including voice and data integration, scalability, VoIP capabilities, user-friendly interface, and interoperability, makes it an ideal choice for businesses looking to elevate their communications strategy.