DS26401 datasheet(255/309 Pages) DALLAS

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DS26401 Octal T1/E1/J1 Framer

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11.18 HDLC Transmit Example

The HDLC status registers in the DS26401 allow for flexible software interface to meet the user’s preferences.

When transmitting HDLC messages, the host can choose to be interrupt driven, or to poll to desired status

registers, or a combination of polling and interrupt processes may be used. An example routine for using the

DS26401 HDLC receiver is given in Figure 11-1.

Figure 11-1. HDLC Message Transmit Example

Reset Transmit

HDLC Controller

(THC.5)

Configure Transmit

HDLC Controller

(THC1,THC2,THBSE,THFC)

TLWM

Interrupt?

Enable TMEND

Interrupt

No Action Required

Work Another Process

Enable TLWM

Interrupt and

Verify TLWM Clear

Read TFBA

N = TFBA[6..0]

Push Message Byte

into Tx HDLC FIFO

(THF)

Last Byte of

Message?

YES

Set TEOM

(THC1.2)

Push Last Byte

into Tx FIFO

Loop N

TMEND

Interrupt?

YES

Read TUDR

Status Bit

TUDR = 1

YES

Disable TMEND Interrupt

Resend Message

Disable TMEND Interrupt

Prepare New

Message

YES

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