SINTRAN HDLC Software Flow¶

How SINTRAN software manages HDLC operations

Key Subroutines¶

XSSDATA - Transmit Data¶

Main transmission entry point that validates, prepares DMA descriptors, and initiates transmission.

HIINT - Receiver Interrupt Handler¶

Processes incoming frames, validates status, and delivers data to applications.

HOINT - Transmitter Interrupt Handler¶

Handles transmission completion, checks for errors, manages retries.

PROCPKT - Process Packet¶

Extracts and validates received frame data.

ZSTARC - Restart Receiver¶

Prepares receiver for next frame after successful reception.

Activity State Management¶

The ACTSW (Activity Switch) variable controls all interrupt processing: - ACTSW = 0: Device inactive, interrupts ignored - ACTSW = 1: Device active, interrupts processed