MH8980DE Просмотр технического описания (PDF) - Mitel Networks

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Компоненты Описание

производитель

MH8980DE

ISO-CMOS ST-BUS™ FAMILY Digital Switch

Mitel Networks 

MT8980D

Pin Description (continued)

Pin #

Name

40 44 44

DIP PLCC QFP

Description

12 14 8

C4i 4.096 MHz Clock (Input). ST-BUS bit cell boundaries lie on the alternate falling

edges of this clock.

13- 15- 9-11 A0-A2 Address 0 to 2 (Inputs). These are the inputs for the address lines on the

15 17

microprocessor interface.

16- 19- 13- A3-A5 Address 3 to 5 (Inputs). These are the inputs for the address lines on the

18 21 15

microprocessor interface.

19 22 16

DS Data Strobe (Input). This is the input for the active high data strobe on the

microprocessor interface.

20 23 17 R/W Read or Write (Input). This is the input for the read/write signal on the

microprocessor interface - high for read, low for write.

21 24 18

CS Chip Select (Input). This is the input for the active low chip select on the

microprocessor interface

22- 25- 19- D7-D5 Data 7 to 5 (Three-state I/O Pins). These are the bidirectional data pins on the

24 27 21

microprocessor interface.

25- 29- 23- D4-D0 Data 4 to 0 (Three-state I/O Pins). These are the bidirectional data pins on the

29 33 27

microprocessor interface.

30 34 28 VSS Power Input. Negative Supply (Ground).

31- 35- 29- STo7- ST-BUS Output 7 to 3 (Three-state Outputs). These are the pins for the eight 2048

35 39 33 STo3 kbit/s ST-BUS output streams.

36- 41- 35- STo2- ST-BUS Output 2 to 0 (Three-state Outputs). These are the pins for the eight 2048

38 43 37 STo0 kbit/s ST-BUS output streams.

39 44 38 ODE Output Drive Enable (Input). If this input is held high, the STo0-STo7 output drivers

function normally. If this input is low, the STo0-STo7 output drivers go into their high

impedance state. NB: Even when ODE is high, channels on the STo0-STo7 outputs

can go high impedance under software control.

40 1 39

6, 18, 12,

28, 22,

40 34,

44

CSTo Control ST-BUS Output (Complementary Output). Each frame of 256 bits on this

ST-BUS output contains the values of bit 1 in the 256 locations of the Connection

Memory High.

NC No Connection.

2-5

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