PXB4219 Datasheet, PDF (54/290 Pages) Infineon Technologies AG – IWE8 Interworking Element for 8 E1/T1 Lines

PXB4219 / PXB4220 / PXB4221
Operational Description
If all physical layer cells should be deleted, the “msk_rx_hd” should be set to 1111
1110.
• For ATM Forum compliance, the “prg_rx_hd” field should be set to 0000 0000.
The “msk_rx_hd” should be set to 1111 1110. This configuration will delete all
unassigned cells.
The deletion of idle, physical layer or unassigned cells can be enabled or disabled per
port by “delete_idle_cells” in the “ATM Receive Reference Slot” of RAM1
(Chapter 6.1.1.1).
4.2.2 Setup of ATM Receive Ports
Each ATM receive port can be configured in the “channel_mode” field of the “ATM
Receive Reference Slot” in RAM1 to operate in “Inactive”, “Active” or “Standby” mode.
In “Inactive” mode, no data is accepted from the framer receive interface.
In “Active” mode, data is accepted from the framer receive interface, cells are written into
the ATM Receive Buffer and cell addresses are written into the Output Queue.
In “Standby” mode, data is accepted from the framer receive interface but no cells are
written into the ATM Receive Buffer or the Output Queue. This mode can be used to test
the cell delineation.
When activating ATM receive ports, it is important to follow the initialization sequence as
shown in Table 14. Step 2 must be held at least 250 µs to internally reset the ATM
receive port. During this time the device connected to the Framer Transmit Interface has
to be in normal operation allowing the IWE8 to synchronize itself on the frame pulse.
Table 14 Activation sequence for ATM receive ports
Step pcfN.
p_rx_act
ATM Receive Reference Slot.
channel_mode
1
0 = inactive
00 = Inactive
2
1 = active
00 = Inactive
3
1 = active
01 or 11 = Active
Minimum Time
250 µs
Data Sheet
54
2002-05-06