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XRT83SH38
46
REV. 1.0.7
8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
TABLE 17: MOTOROLA MODE: MICROPROCESSOR INTERFACE SIGNALS
XRT83SH38
PIN NAME
MOTOROLA
EQUIVALENT PIN
TYPE
DESCRIPTION
ALE
AS
I
Address Strobe:
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
I
Read/Write:
This input pin from the local
P is used to inform the LIU
whether a Read or Write operation has been requested. When this pin is
pulled “High”, DS will initiate a read operation. When this pin is pulled
“Low”, DS will initiate a write operation.
RD_DS
DS
I
Data Strobe:
This active low input functions as the read or write signal from the
local
P dependent on the state of R/W. When DS is pulled “Low” (If CS
is “Low”) the LIU begins the read or write operation.
RDY
DTACK
O
Data 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.