DS3134 datasheet(80/203 Pages) DALLAS

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DS3134

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Transmit HDLC Functions Table 6.1C

Zero Stuffing

- Only used in between opening and closing flags.

- Will be disabled in between a closing flag and an opening flag and for sending aborts and/or

interfill data.

- Disabled if the channel is set to the transparent mode.

Interfill Selection

- Can be either 7Eh or FFh.

Flag Generation

- A programmable number of flags (1 to 16) can be set in between packets.

- Disabled if the channel is set to the transparent mode.

CRC Generation

- Can be either CRC-16 or CRC-32 or none.

- Disabled if the channel is set to transparent mode.

Invert Data

- All data (including the flags & FCS) is inverted after processing.

- Also available in the transparent mode

Bit Flip

- The LSB (normal mode) of the byte from the FIFO becomes the first bit sent or the MSB

(Telecom mode) becomes the first bit sent.

- Also available in the transparent mode.

Transparent Mode

- If enabled, flag generation, zero stuffing, and FCS generation is disabled.

- Will pass bytes from the PCI Bus to Layer 1 on octet (i.e. byte) boundaries.

Invert FCS

- When enabled, it will invert all of the bits in the FCS (useful for HDLC testing).

6.2 HDLC REGISTER DESCRIPTION

RHCDIS

0400h

5432

HCID7

HCID6

HCID5

HCID4

HCID3

HCID2

HCID1

HCID0

IAB

IARW

n/a

Note: Bits that are underlined are read only, all other bits are read-write; default value for all bits is 0.

Bits 0 to 7 / HDLC Channel ID (HCID0 to HCID7).

00000000 (00h) = HDLC Channel Number 1 (also used for the Fast HDLC Engine on Port 0)

00000001 (01h) = HDLC Channel Number 2 (also used for the Fast HDLC Engine on Port 1)

00000010 (02h) = HDLC Channel Number 3

11111111 (FFh) = HDLC Channel Number 256

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