FALC
56
PEF 2256 H/E
T1/J1 Registers
User’s Manual
Hardware Description
404
DS1.1, 2003-10-23
XMFS should not be selected in parallel. Register PC1 configures
port XPA, while PC2
→
port XPB, PC3
→
port XPC and PC4
→
port
XPD.
0000 = SYPX: Synchronous Pulse Transmit (Input)
Together with register XC(1:0) SYPX defines the frame begin
on the transmit system interface ports XDI and XSIG.
0001 = XMFS: Transmit Multiframe Synchronization (Input)
Together with register XC(1:0) XMFS defines the frame and
multiframe begin on the transmit system interface ports XDI
and XSIG. Depending on PC5.CXMFS the signal on XMFS is
active high or low.
0010 = XSIG: Transmit Signaling Data (Input)
Input for transmit signaling data received from the signaling
highway. Optionally sampling of XSIG data is controlled by
the active high XSIGM marker.
0011 = TCLK: Transmit Clock (Input)
A 1.544/6.176MHz clock has to be sourced by the system if
the internal generated transmit clock (DCO-X) is not used.
Optionally this input is used as a synchronization clock for the
DCO-X circuitry with a frequency of 1.544 or 6.176 MHz.
0100 = XMFB: Transmit Multiframe Begin (Output)
Marks the beginning of every transmit multiframe.
0101 = XSIGM: Transmit Signaling Marker (Output)
Marks the time slots which are defined by register TTR(4:1) of
every frame on port XDI.
0110 = DLX: Data Link Bit Transmit (Output)
Marks the S
a
-bits within the data stream on XDI.
0111 = XCLK: Transmit Line Clock (Output)
Frequency: 1.544MHz
1000 = XLT: Transmit Line Tristate (Input)
With a high level on this port the transmit lines XL1/2 or
XDOP/N are set directly into tristate. This pin function is
logically ored with register XPM2.XLT.
1001 = GPI: General Purpose Input
1010 = GPOH: General Purpose Output High
1011 = GPOL: General Purpose Output Low