SA2030 查看數據表（PDF） - South African Micro Electronic Systems

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SA2030

PCM FRAME ALIGNER

South African Micro Electronic Systems 

SA9101

Transmit Link Interface

Similar to the Receive Link Interface two different data types with selectable active

polarity for the output are supported:

- Dual rail data (PCM[+], PCM[-]) at ports DXA, DXB with selectable duty cycle (50%

or 100%) transmitted to a Line Interface Unit. Single rail data is converted into a dual

rail bit stream. The HDB3 line code is employed.

- Unipolar data at port OPOUT with 100% duty cycle transmitted to a fibre optical

interface.

Clocking of data is carried out on the positive transitions of the Transmit Route Clock:

XRCLK (2048 kHz). XRCLK is generated by the SA9101.

Additionally, the dual rail outputs XTOP and XTOM are provided for test applications.

Additional functions

Alarm Interrupt

Normally, the control of data transmission via the PCM line is carried out by polling the

internal status registers of the SA9101 at equal time intervals. However, for fast error

handling the option exists to configure a specific output port as interrupt port (AINT). This

signal may be connected to an interrupt input of the on-board processor. Triggering of

the output may be caused by up to 10 maskable interrupt sources.

Single Channel Loop Back

As one of the extended test options, the Single Channel Loop Back enables reflection

of a selected channel back to the system interface at port DRO.

TS16 Extraction/Insertion

TS16 data can be extracted/inserted via the µP or the DMA facility provided. For µP

interface, RREQ/XREQ act as interrupts. When one of these interrupts is received two

bytes must be read/written consecutively before next frame information is written into it.

For DMA operation see detailed timing diagram, Fig 7.3. (See DIU Controller Pin

description table, CR6B6 Register and SR5B5 Register descriptions.)

Data Extraction/Insertion is also possible through the serial ports DRO and DXI by using

a multiplexer in conjunction with the control signals RCAS/TCAS generated by the

SA9101.

Serial Data extraction on System Side

Together with the Double Frame Marker generated by the SA9101, any position in the

serial data can be pointed to, for extraction.

Idle Code Insertion

In TX direction any channel can be selected for idle code insertion using the Idle Channel

Register bank.

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