xrt75r12 Exar Corporation, xrt75r12 Datasheet - Page 14

• Manufacturer Part Number: xrt75r12
• Description: Twelve Channel E3/ds3/sts-1 Line Interface Unit With Jitter
• Manufacturer: Exar Corporation

XRT75R12
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
MICROPROCESSOR PARALLEL INTERFACE -
P
M22
M23
M24
M26
K25
K26
N26
P22
R26
T26
U26
R25
R24
R23
R22
P26
L26
N2
IN
#
S
IGNAL
RESET
Addr0
Addr1
Addr2
Addr3
Addr4
Addr5
Addr6
Addr7
INT
D0
D1
D2
D3
D4
D5
D6
D7
N
AME
T
I/O
YPE
O
I
I
An eight bit direct address bus that specifies the source/destination register for a
Read or Write operation.
An eight bit bi-directional data bus that provides the data into the LIU for a Write
operation or the data out to the Host for a Read operation.
Interrupt Active Output (active low)
Normally, this output pin will be pulled "High". However, if the user enables
interrupts within the LIU, and if those conditions occur, the XRT75R12 will sig-
nal an interrupt from the Microprocessor by pulling this output pin "Low". The
Host Microprocessor must ascertain the source of the interrupt and service it.
Reading the source of the interupt will clear the flag and the INT pin will go back
high unless another interrupt has gone active.
N
RESET Input
Pulsing this input "Low" causes the XRT75R12 to reset the contents of the on-
chip Command Registers to their default values. As a consequence, the
XRT75R12 will then also be operating in its default condition.
For normal operation this input pin should be at a logic "High".
N
OTES
OTE
1. This pin will remain "Low" until the Interrupt has been serviced.
2. This pin must be pulled "High" with a 3k
: This input pin is internally pulled high.
:
11
D
ESCRIPTION
± 1% resistor.
REV. 1.0.4