PDI1394L40 datasheet(57/80 Pages) PHILIPS

57 / 80 page

Philips Semiconductors

Preliminary specification

PDI1394L40

1394 enhanced AV link layer controller

2000 Dec 15

13.2.6

Isochronous Transmitter Control Register (ITXCTL) – Base Address: 0x34

29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

SV01844

TAG

CHANNEL

SPD

31 30

Reset Value 0x00000000

Bit 15..14:

R/W

Tag: Tag code to insert in isochronous bus packet header. Should be ‘01’ for IEC 61883 International Standard data.

Bit 13..8:

R/W

Channel: Isochronous channel number.

Bit 5..4:

R/W

Speed: Cable transmission speed (S100, S200, S400).

00 = 100Mbs

01 = 200Mbs

10 = 400Mbs

11 = reserved

Bit 0

SY: Sync code to insert in SY field of isochronous bus packet header. This bit reflects the value of the AVx SY pin

and is synchronized with the data payload that was associated with it.

13.2.7

Isochronous Transmitter Memory Status (ITXMEM) – Base Address: 0x038

The AV Transmitter Memory Status register reports on the condition of the internal memory buffer used to store incoming AV data streams

before transmission over the 1394 bus. This register is used primarily for diagnostics; several memory status flags are also available in the

ITXINTACK register.

29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

SV01056

3130

Reset Value 0x00000003

BIT 6:

ITXM100LFT: 100 or less quadlets of storage available.

Bit 5:

ITXM256LFT: Memory has 256 quadlets of space remaining before becoming full.

Bit 4:

ITXM512LFT: Memory has 512 quadlets of space remaining before becoming full.

Bit 3:

ITXMF: memory is completely full, no storage available.

Bit 2:

ITXMAF: almost full, exactly one quadlet of storage available.

Bit 1:

ITXM5AV: at least 5 more quadlets of storage available.

Bit 0:

ITXME: memory bank is empty (zero quadlets stored).

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