XRT72L13 datasheet(27/370 Pages) EXAR

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XRT72L13

M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

PRELIMINARY

REV. P1.0.6

Rd_DS

Read Data Strobe (Intel Mode):

If the microprocessor interface is operating in the Intel Mode, then this

input will function as the RD* (READ STROBE) input signal from the

local mP. Once this active-low signal is asserted, then the Framer will

place the contents of the addressed registers (within the Framer) on

the Microprocessor Data Bus (D[7:0]). When this signal is negated,

the Data Bus will be tri-stated.

Data Strobe (Motorola Mode):

If the microprocessor interface is operating in the Motorola mode,

then this pin will function as the active-low Data Strobe signal.

I/O

Bi-directional Data Bus (Microprocessor Interface Section):

Please see description for D7

Address Bus Input (Microprocessor Interface):

(Please see description for A8)

VDD

****

Power Supply Pin

WR_RW

Write Data Strobe (Intel Mode)

If the microprocessor interface is operating in the Intel Mode, then this

active-low input pin functions as the WR* (Write Strobe) input signal

from the mP. Once this active-low signal is asserted, then the Framer

will latch the contents of the mP Data Bus, into the addressed register

(or RAM location) within the Framer IC.

R/W Input Pin (Motorola Mode)

When the Microprocessor Interface Section is operating in the "Motor-

ola Mode", then this pin is functionally equivalent to the "R/W*" pin. In

the Motorola Mode, a "READ" operation occurs if this pin is at a logic

"1". Similarly, a WRITE operation occurs if this pin is at a logic "0".

I/O

MSB of Bi-Directional Data Bus (Microprocessor Interface Sec-

tion):

This pin, along with pins D0 - D6, function as the Microprocessor

Interface bi-directional data bus, and is intended to be interfaced to

the "local" microprocessor.

Address Bus Input (Microprocessor Interface) - MSB (Most Sig-

nificant Bit):

This input pin, along with inputs A0 - A7 are used to select the on-chip

Framer register and RAM space for READ/WRITE operations with the

"local" microprocessor.

GND (TEST MODE)

****

Ground Pin

PIN DESCRIPTIONS

PIN #NAME

TYPE

DESCRIPTION

XRT72L13 Datasheet(PDF) 27 Page - Exar Corporation

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