XRT7245
DS3 UNI FOR ATM
á
PRELIMINARY
REV. 1.03
6
The On-Chip Line Interface Scan Register allows
the user to monitor the state of 3 input pins. The
function of these input pins, when asserted, are
tabulated below.
FEATURES
TRANSMIT AND RECEIVE SECTIONS
UTOPIA I
NTERFACE
B
LOCKS
Compliant with UTOPIA Level 2 Interface Specifi-
cation (e.g., supports Single-PHY or Multi-PHY
operation).
8-bit or 16-bit wide UTOPIA Data Bus operation in
the Transmit and Receive Directions.
The UTOPIA Data Bus runs at clock rates of 25
MHz, 33 MHz and 50 MHz
Supports Octet-Level and Cell-Level Handshaking
between the UNI and the ATM Layer processor.
The Transmit UTOPIA Interface block performs par-
ity checking of ATM cell data that is written into it,
by the ATM Layer processor. Will optionally discard
errored cells.
Contains on-chip 16 cell FIFO in the Transmit
Direction (TxFIFO)
The TxFIFO can be configured to operate with
depths of 4, 8, 12 or 16 cells
Contains on-chip 4 cell FIFO in the Receive
Direction (RxFIFO)
RLOOP
Remote Loop-Back Mode Select:
This bit-field, along with LLOOP can be used to configure the XRT7300 device into one of four different
loop-back modes.
Setting RLOOP to “1” (with LLOOP = 0) configures the XRT7300 device to operate in the Remote
Loop-Back Mode.
Setting RLOOP to “1” (with LLOOP = 1) configures the XRT7300 device to operate in the “Digital Local
Loop-Back” Mode.
Setting RLOOP to “0” (with LLOOP = 1) configures the XRT7300 device to operate in the “Analog Local
Loop-Back” Mode.
Setting RLOOP to “0” (with LLOOP = 0) configures the XRT7300 device to operate in the “Normal”
(No-Loop-back) Mode.
LLOOP
Local Loop-Back Mode Select:
This bit-field along with RLOOP can be used to configure the XRT7300 device into one of four different
loop-back modes.
Setting LLOOP to “1” (with RLOOP = 0) configures the XRT7300 device to operate in the “Analog Local
Loop-back” Mode.
Setting LLOOP to “1” (with RLOOP = 1) configures the XRT7300 device to operate in the “Digital Local
Loop-back” Mode.
Setting LLOOP to “0” (with RLOOP = 0) configures the XRT7300 device to operate in the “Normal”
(No-Loop-back) Mode.
Setting LLOOP to “0” (with RLOOP = 1) configures the XRT7300 device to operate in the “Remote
Loop-back” Mode.
Signal Name
Function of Output Pin
S
IGNAL
N
AME
F
UNCTION
OF
I
NPUT
P
IN
IF
ASSERTED
DMO
Indicates that the "Drive Monitor" circuitry within the XRT7300 has not detected any bipolar signals
within the last 128 ± 32 bit periods.
RLOL
Indicates that the "Clock Recovery" circuit, within the XRT7300 has lost "lock" with the incoming DS3
line signal.
RLOS
Indicates that the XRT7300 device is declaring an LOS (Loss of Signal) Condition.