xrt94l33 Exar Corporation, xrt94l33 Datasheet - Page 160

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

XRT94L33
Rev.1.2.0.
Figure 13 Flow Chart depicting the approach that the ATM Layer Processor should take when writing
ATM Cell Data into the Transmit UTOPIA Interface block, when the XRT94L33 is operating in the
Single PHY Mode
Check the level of the TxUClav pin.
No
TxUClav sampled
(word) of a new
the first byte
START
“High”?
Is this
cell?
Is
No
Yes
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
Yes
Perform all of the following, concurrently
Place the first byte (word) on the Transmit
UTOPIA Data Bus.
Assert the “Transmit UTOPIA Data Bus Write
Enable” pin, TxUEnb*.
Place the odd-parity value of this byte (word)
on the TxUPrty input pin
Assert the TxUSoC input pin
Place the odd-parity value of this byte (word)
on the TxUPrty input pin
Place the first byte (word) on the Transmit
UTOPIA Data Bus.
Assert the “Transmit UTOPIA Data Bus Write
Enable” pin, TxUEnb*.
WRITING THE FIRST BYTE/WORD OF
WRITING THE REMAINING BYTES/
Perform all of the following, concurrently
No
160
WORDS OF A CELL
current Cell
Complete?
A CELL
Is the
Yes
anymore Cells
No
Is there
to write
END
xr
?
Yes