xrt94l33 Exar Corporation, xrt94l33 Datasheet - Page 27

• Manufacturer Part Number: xrt94l33
• Description: Multi-channel, Multi-function Device Aggregates 3 Ds3/e3/sts-1 Into Oc3/stm-1
• Manufacturer: Exar Corporation

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3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
E9
C6
A4
TxE1F1E2Enable
TxE1F1E2Frame
TxE1F1E2
O
O
I
CMOS
CMOS
TTL
Transmit E1-F1-E2 Byte Input Port – Enable (or Ready)
Indicator Output pin:
This output pin, along with the “TxTOHClk” output pin and the
“TxE1F1E2” input pin permit the user to insert their value for
the E1, F1 and E2 bytes, into the Transmit STS-3 TOH
Processor Block. The Transmit STS-3 TOH Processor block
will accept this data and will insert into the E1, F1 and E2 byte-
fields, within the “outbound” STS-3 data-stream.
Whatever external circuitry (which is connected to the
“TxTOHClk”, the “TxE1F1E2” and this output pin), is suppose
to do the following.
It should continuously monitor the state of this output pin.
Whenever this output pin pulses “HIGH”, then the external
circuitry should place the next “orderwire” bit (to be inserted
into the “Transmit STS-3 TOH Processor” block) onto the
“TxE1F1E2” input pin, upon the rising edge of “TxTOHClk”.
Any data that is placed on the “TxE1F1E2” input pin, will be
sampled upon the falling edge of “TxOHClk”.
Transmit E1-F1-E2 Byte Input Port – Framing Output Pin.
This output pin pulses “HIGH” for one period of “TxTOHClk”,
one “TxTOHClk” bit-period prior to the “Transmit E1-F1-E2
Byte Input Port” expecting the very first byte of the E1 byte,
within a given “outbound” STS-3 frame.
Transmit E1-F1-E2 Byte Input Port – Input Pin:
This input pin, along with the “TxE1F1E2Enable” and the
“TxTOHClk” output pins permit the user to insert their value for
the E1, F1 and E2 bytes, into the Transmit STS-3 TOH
Processor Block. The Transmit STS-3 TOH Processor block
will accept this data and insert it into the E1, F1 and E2 byte
fields, within the “outbound” STS-3 data-stream.
Whatever external circuitry that is interfaced to this input pin,
the “TxE1F1E2Enable” and the “TxTOHClk” pins is suppose to
do the following.
It
“TxE1F1E2Enable” input pin.
Whenever the “TxE1F1E2Enable” input pin pulses “HIGH”,
then the external circuitry should place the next “orderwire” bit
(to be inserted into the “Transmit STS-3 TOH Processor”
block) onto this input pin upon the rising edge of “TxTOHClk”.
Any data that is placed on the “TxE1F1E2” input pin, will be
sampled upon the falling edge of “TxTOHClk”.
Note:
27
should
used.
This pin should be connected to GND if it is not
continuously
monitor
the
state
XRT94L33
of
Rev.1.2.0.
the