XRT72L56 Datasheet, PDF (40/486 Pages) Exar Corporation – SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

XRT72L56
SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.2
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PRELIMINARY
PIN DESCRIPTION FOR THE XRT72L56
PIN #
R26
T1
T2
T3
T4
T11
T12
T13
T14
T15
T16
T23
T24
T25
T26
U1
U2
U3
U4
PIN NAME
A(11)
RxOutClk[3]/
RxHDLCDat7[3]
TxLineClk[3]
RxNEG[3]
TxFrameRef[3]
VDD
VDD
GND
GND
VDD
VDD
CS
Reset
MOTO
TestMode
RxPOS[3]
RxLineClk[3]
TxInClk[3]
RxNEG[4]
TYPE
I
O
DESCRIPTION
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" microprocessor.
See Description for Pin K3
O See Description for Pin J2
I
See Description for Pin G1
I
See Description for Pin H1
**** Power Supply 3.3V + 5%
**** Power Supply 3.3V + 5%
**** Ground
**** Ground
**** Power Supply 3.3V + 5%
**** Power Supply 3.3V + 5%
I
Chip Select Input:
This active-low input signal selects the Microprocessor Interface Section of
the Framer device and enables READ/WRITE operations between the Local
Microprocessor and the Framer on-chip registers and RAM locations.
I
Reset Input:
When this "active-low" signal is asserted, the Framer device will be asyn-
chronously reset. Additionally, all outputs will be "tri-stated", and all on-chip
registers will be reset to their default values.
I
Motorola/Intel Processor Interface Select Mode:
This input pin allows the user to configure the Microprocessor Interface to
interface with either a "Motorola-type" or "Intel-type" microprocessor/micro-
controller. Tying this input pin to VCC, configures the microprocessor inter-
face to operate in the Motorola mode (e.g., the Framer device can be readily
interfaced to a "Motorola type" local microprocessor). Tying this input pin to
GND configures the Microprocessor Interface to operate in the Intel Mode
(e.g., the Framer device can be readily interfaced to a “Intel type" local
microprocessor).
*** Factory Test Pin:
The user should tie this pin to Ground.
I
See Description for Pin H2
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See Description for Pin J4
I
See Description for Pin H3
I
See Description for Pin G1
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