PXB4219 Datasheet, PDF (97/290 Pages) Infineon Technologies AG – IWE8 Interworking Element for 8 E1/T1 Lines

PXB4219 / PXB4220 / PXB4221
Interface Description
5.1.2 Generic Interface Mode (GIM)
The Generic Interface Mode (GIM) makes the framer interface more universal, so that
other framer/ line interface units or T1/E1 transceivers can be connected directly to the
IWE8. Depending on the E1/T1 pin, the interface can be adopted to line bit rates of 1.544
MHz (T1 rate) or 2.048 MHz (E1 rate). The mode is enabled by setting bit om = 01_B in
“opmo”, see Chapter 7.24. Make sure that no clocks are applied to the transmitter when
switching to GIM.
5.1.2.1 T1 Mode
FRCLK[0:7]
FRDAT[0:7]
FRMFB[0:7]
FRFRS[0:7]
FRLOS[0:7]
FTCKO[0:7]
Data Sheet
Framer Receive Clock
Receive clock input at 1.544 MHz
Framer Receive Data
depending on bit “frri” in “opmo”:
0=
FRDAT is sampled with the falling edge of FRCLK
1=
FRDAT is sampled with the rising edge of FRCLK
Framer Receive Multiframe Begin
Depending on bits p_ces in pcfN:
0=
Structured CES: A pulse on this pin designates the
first frame of a new multiframe
1=
Unstructured CES: Unused, no constant level
allowed
Depending on bit “rfpp” in “opmo”:
0=
FRMFB is active low
1=
FRMFB is active high
FRMFB is always sampled with the falling edge of FRCLK.
Framer Receive Frame Synchronization Pulse
Permanently inactive
Framer Receive Loss of Signalling
Framer Transmit Clock
depending on bits ftckn in ftcs:
00 =
depending on bit “rts_eval” in “opmo”:
0 = Transmit clock input with 1.544 MHz
1 = Clock of ICRC is used as transmit clock and is
also switched to FTCKO pins (FTCKO is output
pin)
01 =
FRCLK
97
2002-05-06