AK2548 Datasheet, PDF (26/30 Pages) Asahi Kasei Microsystems – 7 channel E1 Transceiver

ASAHI KASEI
[AK2548]
Local Loopback
In Local Loopback mode, TPOSx,TNEGx,TCLKx signals are looped back to RPOSx, RNEGx,
RCLKx output. RTIPx,RRINGx inputs are ignored but loss of signal detection is active.
The transmitter in channel x outputs TTIPx,TRINGx normally.
Remote Loopback
In Remote Loopback mode, RTIPx/RRINGx signals are looped back to TTIPx/TRINGx output.
The receiver in channel x output RPOSx,RNEGx,RCLKx normally and detect loss of signal.
TPOSx,TNEGx,TCLKx inputs are ignored. When TAOSx is “high”, all mark signal is output to
TTIPx/TRINGx.
Interface
Interface to control/status register is selected by P/S pin. When P/S is set to “low”, parallel
interface is selected. When P/S is set to “high”, serial interface is selected.
Parallel Interface
Bus type(Intel/Motorola) is selected by BTS pin.
When BTS is set to “high”, Motorola mode is selected. When BTS is set to “low”, Intel mode is
selected.
Serial Interface
The timing of serial interface is shown below.
CS
SCLK
SDI
SDO
R/W A0 A1 A2 A3 A4 A5 A6 D0 D1 D2 D3 D4 D5 D6 D7
High-Z
D0 D1 D2 D3 D4 D5 D6 D7
R/W=1: read
R/W=0: write
C0028-E-00
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