MT9075B 데이터 시트보기 (PDF) - Zarlink Semiconductor Inc

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MT9075B

E1 Single Chip Transceiver

Zarlink Semiconductor Inc 

MT9075B

Data Sheet

Pin Description (continued)

Pin #

PLCC MQFP

Name

Description

12 85

IRQ Interrupt Request (Output). A low on this output pin indicates that an interrupt request

is presented. IRQ is an open drain output that should be connected to VDD through a pull-

up resistor. An active low CS signal is not required for this pin to function.

13 - 86- D0 - D3 Data 0 to Data 3 (Three-state I/O). These signals combined with D4-D7 form the

16 89

bidirectional data bus of the microprocessor interface (D0 is the least significant bit).

17 90 VSS Negative Power Supply (Input). Digital ground.

18 91

IC Internal Connection. Tie to VSS (Ground) for normal operation.

19 92 INT/MOT Intel/Motorola Mode Selection (Input). A high on this pin configures the processor

interface for the Intel parallel non-multiplexed bus type. A low configures the processor

interface for the Motorola parallel non-multiplexed type.

20 93 VDD Positive Power Supply (Input). Digital supply (+5V ± 5%).

21 - 94- D4 - D7 Data 4 to Data 7 (Three-state I/O). These signals combined with D0-D3 form the

24 97

bidirectional data bus of the microprocessor interface (D7 is the most significant bit).

25 98 R/W/WR Read/Write/Write Strobe (Input).

In Motorola mode (R/W), this input controls the direction of the data bus D[0:7] during

a microprocessor access. When R/W is high, the parallel processor is reading data

from the MT9075B. When low, the microprocessor is writing data to the MT9075B.

For Intel mode (WR), this active low write strobe configures the data bus lines as

output.

26 - 99, AC0 - Address/Control 0 to 4 (Inputs). Address and control inputs for the microprocessor

30 8-11 AC4 interface. AC0 is the least significant input.

31 12 GNDARx Receive Analog Ground (Input). Analog ground for the LIU receiver.

32 13 RTIP Receive TIP and RING (Inputs). Differential inputs for the receive line signal - must be

33 14 RRING transformer coupled (See Figure 4).

34 15 VDDARx Receive Analog Power Supply (Input). Analog supply for the LIU receiver (+5V ± 5%).

35 16 VDD Positive Power Supply (Input). Digital supply (+5V ± 5%).

36 17 VSS Negative Power Supply (Input). Digital ground.

37 18

IC Internal Connection. Must be left open for normal operation.

38 19

IC Internal Connection. Must be left open for normal operation.

39 20 RxDLCLK Receive Data Link Clock (Output). A gapped clock signal derived from a 2.048 Mbit/s

clock, available for an external device to clock in RxDL data (at 4, 8, 12, 16 or 20 kHz) on

the rising edge.

40 21

RxDL Receive Data Link (Output). A 2.048 Mbit/s data stream containing received line data

after HDB3 decoding. This data is clocked out with the rising edge of E2o.

41 22

TxMF

Transmit Multiframe Boundary (Input). An active low input used to set the transmit

multiframe boundary (CAS or CRC multiframe). The MT9075B will generate its own

multiframe if this pin is held high. This input is usually pulled high for most applications.

5

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