XRT83SL314IB datasheet(49/85 Pages) EXAR

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XRT83SL314

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

PRELIMINARY

REV. P1.0.5

TABLE 17: MOTOROLA MODE: MICROPROCESSOR INTERFACE SIGNALS

XRT83SL314

PIN NAME

MOTOROLA

EQUIVALENT PIN

TYPE

DESCRIPTION

ALE_TS

Transfer Start: This active high signal is used to latch the contents on the

address bus ADDR[7:0]. The contents of the address bus are latched into the

ADDR[7:0] inputs on the falling edge of TS.

WR_R/W

R/W

Read/Write: This input pin from the local

µP is used to inform the LIU

whether a Read or Write operation has been requested. When this pin is

pulled “High”, WE will initiate a read operation. When this pin is pulled

“Low”, WE will initiate a write operation.

RD_WE

Write Enable: This active low input functions as the read or write signal from the

local

µP dependent on the state of R/W. When WE is pulled “Low” (If CS

is “Low”) the LIU begins the read or write operation.

No Pin

Output Enable: This signal is not necessary for the XRT83SL314 to interface to

the MPC8260 or MPC860 Power PCs.

µPCLK

CLKOUT

Synchronous Processor Clock: This signal is used as the timing reference for

the Power PC synchronous mode.

RDY_TA

Transfer Acknowledge: This active low signal is provided by the LIU device. It

indicates that the current read or write cycle is complete, and the LIU is waiting

for the next command.

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