MT90881 Просмотр технического описания (PDF) - Zarlink Semiconductor Inc

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производитель

MT90881

TDM to Packet Processors

Zarlink Semiconductor Inc 

MT90880/1/2/3

Data Sheet

2) Board level continuity test mode (T_MODE[1:0] = '10')

In continuity test mode the core of the chip is held in reset. Pin T_D[10] selects the board level test mode.

3) Scan test mode (T_MODE[1:0] = '01')

System clock and PCI clock PLLs are put into bypass mode. The core PCI and system resets are driven directly

from the pins i.e. the logic which holds the resets asserted until the PLLs have had time to lock is disabled.

4) PLL test mode (T_MODE[1:0] = '00')

The core of the chip is held in reset. Test bus pins are configured for direct test access to the system clock and

PCI clock PLLs.

3.8 Power and Ground Connections

Signal

VDD33

VDD18

GROUND

A1VDD

A2VDD

no connection

Package Balls

Description

AA5, AA22, AB5, AB6, AB13, AB14, AB21, AB22, E5, E6, 3.3 V VDD power supply

E13, E14, E21, E22, F5, F22, M5, N5, N22, P5, P22, R22

AA3, E2, F24, H23, J3, L1, M26, P23, R2, V3, W22, Y26 1.8 V VDD power supply

L11, L12, L13, L14, L15, L16, M11, M12, M13, M14, M15,

M16, N11, N12, N13, N14, N15, N16, P11, P12, P13,

P14, P15, P16, R11, R12, R13, R14, R15, R16, T11, T12,

T13, T14, T15, T16, AD25, E23

0 V power supply

D25

1.8 V VDD power supply

AF25

1.8 V VDD power supply

D23, AC16

Table 14 - Power and Ground Connections

4.0 Typical Applications

4.1 Packet Backplane Interconnection

The MT9088x family can be used to entirely replace the TDM backplane infrastructure in a conventional computer

telephony system with a packet backplane. This has several advantages: it is easily scalable, eliminates the timing

problems in passing large TDM buses around the system, uses readily available and low-cost network hardware,

and simplifies the provision of new services to customers. This type of structure can be used in applications as

diverse as telephone switches, multi-service access platforms and voice over IP gateways. Figure 2 shows a

multi-service access platform based on an Ethernet backplane using the MT90880.

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Zarlink Semiconductor Inc.

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