MT90820 查看數據表（PDF） - Mitel Networks

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MT90820

CMOS ST-BUS™ FAMILY Large Digital Switch (LDX)

Mitel Networks 

MT90820 CMOS

Advance Information

Pin Description

Pin #

84 100

Name

52 25 AS/ALE

53 26

IM

55 - 32-39 AD0 - 7

62

65 - 42-49

72

73 50

D8 - 15

DTA

74 55

76 57

CSTo

ODE

77 - 58-65 STo0 - 7

84

- 1 - 4,

NC

27 -

30,

51 -

54

77 -

80

Description

Address Strobe or Latch Enable: This input is only used if multiplexed bus is

selected.

CPU Interface Mode (input): If High, this input selects the multiplexed

microprocessor bus interface. If this input is not connected or grounded, the

device resumes non-multiplexed bus interface.

Address/Data Bus (Bidirectional): These are bi-directional data pins on the

microprocessor interface. In the multiplexed bus mode, these pins also provide

the input address to the internal registers and memories.

Data Bus (Bidirectional): These are additional bi-directional data pins on the

microprocessor interface.

Data Acknowledgement (Open Drain Output): This active low output indicates

that a data bus transfer is complete. A 10 kohm pull-up resistor is required at this

output.

Control Output (output).

Output Device Enable (input): This is the output enable control for the STo0 to

STo15 serial outputs. When this input is high, the STo0-15 output drivers function

normally. If this input is low, Sto0-15 are in high impedance. Note: Even when

ODE is high, each channel may still be put into high impedance state by using per

channel control bit in the connection memory.

Data Stream Output 0 to 7: Serial data Output stream. These streams may have

data rates of 2.048, 4.096 or 8.192Mb/s.

Unused pins.

2-182

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