XRT83SL314IB datasheet(49/85 Pages) EXAR

49 / 85 page

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.

XRT83SL314IB Datasheet(PDF) 49 Page - Exar Corporation