MT90823AP Просмотр технического описания (PDF) - Mitel Networks

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производитель

MT90823AP

3V Large Digital Switch

Mitel Networks 

MT90823 CMOS

Pin Description (continued)

Pin #

84 100 100

PLCC MQFP LQFP

120

BGA

Name

Description

51

24

21

N12

CS Chip Select (5V Tolerant Input): Active low input used

by a microprocessor to activate the microprocessor

port of MT90823.

52

25

22

M11

AS/ALE Address Strobe or Latch Enable (5V Tolerant Input):

This input is used if multiplexed bus operation is

selected via the IM input pin. For Motorola

non-multiplexed bus operation, connect this pin to

ground.

53

26

23

N13

IM CPU Interface Mode (5V Tolerant Input): When IM is

high, the microprocessor port is in the multiplexed

mode. When IM is low, the microprocessor port is in

non-multiplexed mode.

55 - 32-39 29 -

62

36

L12,L13,K12,

K13,J12,J13,

H12,H13

AD0 - 7

Address/Data Bus 0 to 7 (5V Tolerant I/O): These

pins are the eight least significant data bits of the

microprocessor port. In multiplexed mode, these pins

are also the input address bits of the microprocessor

port.

65 - 42-49 39 -

72

46

G12,G13,F12,

F13,E12,E13,

D12,D13

D8 - 15 Data Bus 8-15 (5V Tolerant I/O): These pins are the

eight most significant data bits of the microprocessor

port.

73

50

47

C12

DTA Data Transfer Acknowledgement (5V tolerant

Three-state Output): Indicates that a data bus transfer

is complete. When the bus cycle ends, this pin drives

HIGH and then tri-states, allowing for faster bus cycles

with a weaker pull-up resistor. A pull-up resistor is

required to hold a HIGH level when the pin is tri-stated.

74

55

48

C13

CSTo Control Output (5V Tolerant Output). This is a 4.096,

8.192 or 16.384 Mb/s output containing 512, 1024 or

2048 bits per frame respectively. The level of each bit is

determined by the CSTo bit in the connection memory.

See External Drive Control Section.

76

57

54

B11

ODE Output Drive Enable (5V Tolerant Input): This is the

output enable control for the STo0-15 serial outputs.

When ODE input is low and the OSB bit of the IMS

register is low, STo0-15 are in a high impedance state.

If this input is high, the STo0-15 output drivers are

enabled. However, each channel may still be put into a

high impedance state by using the per channel control

bit in the connection memory.

77 - 58-65 55 - A11,B10,A10,B9, STo0 - 7 Data Stream Output 0 to 7 (5V Tolerant Three-state

84

62

A9,A8,B8,A7

Outputs): Serial data Output stream. These streams

have selectable data rates of 2.048, 4.096 or 8.192 Mb/

s.

6

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