xrt75r12 Exar Corporation, xrt75r12 Datasheet - Page 13

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

GENERAL CONTROL PINS
REV. 1.0.4
MICROPROCESSOR PARALLEL INTERFACE -
P
P24
N24
N22
N23
N25
J26
AE25
AB23
P
IN
AB5
AB4
AE2
P3
IN
#
#
S
S
IGNAL
IGNAL
Pmode
PCLK
RDY
TRST
TEST
WR
TMS
TDO
RD
TCK
CS
TDI
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
N
N
AME
AME
T
****
T
YPE
O
YPE
I
I
I
I
O
I
I
I
I
I
Factory Test Mode Input Pin
This pin must be connected to GND for normal operation.
N
Test Reset
Test Boundary Scan
Test Mode Select
Test Boundary Scan
Test Clock
Test Boundary Scan
Test Data Input
Test Boundary Scan
Test Data Output
Test Boundary Scan
This pin controls the Microprocessor Parallel Interface mode.
"High" sets a Synchronous clocked interface mode with a clock from the Host.
"Low" sets an Asynchronous mode where a clock internal to the XRT75R12 will
time the operations.
High speed clock supplied by the Host to provide timing in the Synchronous
Interface mode. This signal must be a square-wave.
Chip Select Input (active low)
Initiates a read or write operation. When "High", no parallel communication is
active between the LIU and the Host.
Write Input (active low)
Enables the Host to write data D[7:0] into the LIU register space at address
Addr[7:0].
Read Input (active low)
Commands the LIU to transfer the contents of a register specified by Addr[7:0] to
the Host.
Ready Line Output (active low)
Provides a handshake between the LIU and the Host that communicates when
an operation has been completed.
N
OTE
OTE
: This input pin is internally pulled "Low".
: This pin must be pulled "High" with a 3k
10
D
D
ESCRIPTION
ESCRIPTION
± 1% resistor.
XRT75R12