ak2548 AKM Semiconductor, Inc., ak2548 Datasheet - Page 26

• Manufacturer Part Number: ak2548
• Description: 7 Channel E1 Transceiver - Asahi Kasei Microsystems
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
Local Loopback
Remote Loopback
Interface
Interface to control/status register is selected by P/S pin.
interface is selected. When P/S is set to “high”, serial interface is selected.
R/W=1: read
R/W=0: write
C0028-E-00
Parallel Interface
Serial Interface
SCLK
SDI
SDO
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.
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.
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.
The timing of serial interface is shown below.
CS
R/W A0 A1 A2 A3 A4 A5 A6 D0 D1 D2 D3 D4 D5 D6 D7
High-Z
26
D0 D1 D2 D3 D4 D5 D6 D7
When P/S is set to “low”, parallel
[AK2548]
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