XRT83SL314IB View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XRT83SL314IB

14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

Exar Corporation 

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14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

XRT83SL314

REV. 1.0.1

5.0 MICROPROCESSOR INTERFACE BLOCK

The Microprocessor Interface section supports communication between the local microprocessor (µP) and the

LIU. The XRT83SL314 supports an Intel asynchronous interface, Motorola 68K asynchronous, and a Motorola

Power PC interface. The microprocessor interface is selected by the state of the µPTS[2:0] input pins.

Selecting the microprocessor interface is shown in Table 14.

TABLE 14: SELECTING THE MICROPROCESSOR INTERFACE MODE

µPTS[2:0]

MICROPROCESSOR MODE

0h (000)

Intel 68HC11, 8051, 80C188

(Asynchronous)

1h (001)

Motorola 68K (Asynchronous)

7h (111)

Motorola MPC8260, MPC860

Power PC (Synchronous)

The XRT83SL314 uses multipurpose pins to configure the device appropriately. The local µP configures the

LIU by writing data into specific addressable, on-chip Read/Write registers. The microprocessor interface

provides the signals which are required for a general purpose microprocessor to read or write data into these

registers. The microprocessor interface also supports polled and interrupt driven environments. A simplified

block diagram of the microprocessor is shown in Figure 38.

FIGURE 38. SIMPLIFIED BLOCK DIAGRAM OF THE MICROPROCESSOR INTERFACE BLOCK

CS

WR_R/W

RD_WE

ALE

ADDR[10:0]

DATA[7:0]

µPclk

Microprocessor

Interface

µPType [2:0]

Reset

RDY_TA

INT

CS5

CS4

CS3

CS2

CS1

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