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DS33R11 Ethernet Mapper with Integrated T1/E1/J1 Transceiver
36 of 344
NAME PIN TYPE FUNCTION
HARDWARE AND STATUS PINS
LIUC B2 I
Line Interface Unit Connect: When a logic low is present on this
input pin, the T1/E1/J1 Framer and LIU are not internally
connected. The line interface circuitry will be separated from the
framer/formatter circuitry and the TPOSI, TNEGI, TDCLKI, RPOSI,
RNEGI, and RDCLKI input pins will be active.
When a logic high is present on this input pin, the T1/E1/J1 Framer
is internally connected to the LIU. The TPOSI, TNEGI, TDCLKI,
RPOSI, RNEGI, RDCLKI input pins are deactivated. When LIUC is
connected high, the TPOSI, TNEGI, TDCLKI, RPOSI, RNEGI, and
RDCLKI pins should be tied low.
RST
A8 I
Reset for the Ethernet Mapper: An active low signal on this pin
resets the internal registers and logic of the protocol conversion
device. This pin should remain low until power, SYSCLKI, RX_CLK,
and TX_CLK are stable, then set high for normal operation. This
input requires a clean edge with a rise time of 25ns or less to
properly reset the device.
TSTRST C4 I
Test/Reset for the T1/E1/J1 Transceiver: A dual-function pin. A
zero-to-one transition issues a hardware reset to the transceiver
register set. A reset clears all configuration registers. Configuration
register contents are set to zero. Leaving TSTRST high will tri-state
all output and I/O pins (including the parallel control port). Set low
for normal operation. Useful in board-level testing.
MODEC[0],
MODEC[1]
B19,
B20
I
Mode Control for Processor Interface:
00 = Read/Write Strobe Used (Intel Mode)
01 = Data Strobe Used (Motorola Mode)
10 = Reserved. Do not use.
11 = Reserved. Do not use.
QOVF H18 O
Queue Overflow for Ethernet Mapper: This pin goes high when
the transmit or receive queue has overflowed. This pin will go low
when the high watermark is reached again.
RLOS/LTC N1 O
T1/E1/J1 Receive Loss-of-Sync/Loss-of-Transmit Clock: A dual
function output that is controlled by the CCR1.0 control bit. This pin
can be programmed to either toggle high when the synchronizer is
searching for the frame and multiframe or to toggle high if the
TCLKT pin has not been toggled for 5μs.
RCL B5 O
T1/E1/J1 Receive Carrier Loss: Set high when the T1/E1/J1 line
interface detects a carrier loss.
RSIGF P3 O
T1/E1/J1 Receive Signaling-Freeze Output: Set high when the
signaling data is frozen by either automatic or manual intervention.
Used to alert downstream equipment of the condition.