XRT72L50 Datasheet, PDF (17/471 Pages) Exar Corporation – SINGLE CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

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PIN DESCRIPTION
PIN #
10
PIN NAME
RD_DS
11
TCK
12
TMS
13
Int
14
GND
15
A(0)
16
A(1)
17
A(2)
18
A(3)
19
A(4)
20
A(5)
21
A(6)
22
A(7)
23
A(8)
24
VDD
XRT72L50
SINGLE CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. 1.2.1
TYPE
I
I
I
O
****
I
I
I
I
I
I
I
I
I
****
DESCRIPTION
Read Data Strobe (Intel Mode):
If the microprocessor interface is operating in the Intel Mode, then this input
will function as the RD (READ STROBE) input signal from the local µP. Once
this active-low signal is asserted, then the Framer will place the contents of
the addressed registers (within the Framer) on the Microprocessor Data Bus
(D(7:0)). When this signal is negated, the Data Bus will be tri-stated.
Data Strobe (Motorola Mode):
If the microprocessor interface is operating in the Motorola mode, then this pin
will function as the active-low Data Strobe signal.
Test Clock: Boundary Scan clock input.
Test Mode Select: Boundary Scan Mode Select input.
Interrupt Request Output:
This open-drain, active-low output signal will be asserted when the Framer
device is requesting interrupt service from the local microprocessor. This out-
put pin should typically be connected to the Interrupt Request input of the
local microprocessor.
Ground
Address Bus Input (Microprocessor Interface) - LSB (Least Significant
Bit):
(Please see description for A(8) pin 23)
Address Bus Input (Microprocessor Interface) - Bit 7
See description of pin 23
Address Bus Input (Microprocessor Interface) - Bit 7
See description of pin 23
Address Bus Input (Microprocessor Interface) - Bit 7
See description of pin 23
Address Bus Input (Microprocessor Interface) - Bit 7
See description of pin 23
Address Bus Input (Microprocessor Interface) - Bit 7
See description of pin 23
Address Bus Input (Microprocessor Interface) - Bit 7
See description of pin 23
Address Bus Input (Microprocessor Interface) - Bit 7
See description of pin 23
Address Bus Input (Microprocessor Interface) - MSB (Most Significant
Bit):
This input pin, along with inputs A0 - A7 are used to select the on-chip Framer
register and RAM space for READ/WRITE operations with the local micropro-
cessor.
Power Supply 3.3V + 5%
4