HDMP-1012 datasheet(25/42 Pages) HP

25 / 42 page

597

HDMP-1012 (Tx), HDMP-1014 (Rx)

Data Frame Structure

M20SEL Asserted (20 bit data mode)

Data Status

Flag bit

D-Field

C-Field

True

D0 - D19

1101

Inverted

D0 - D19

0010

True

D0 - D19

1011

Inverted

D0 - D19

0100

HDMP-1012 (Tx), HDMP-1014 (Rx)

Operating Modes

M20SEL

FLAGSEL

Description

16 bit data plus error checking

16 bit data plus FLAG

20 bit data plus error checking

20 bit data plus FLAG

HDMP-1012 (Tx), HDMP-1014 (Rx)

Data Frame Structure

M20SEL Not Asserted (16 bit data mode)

Data Status

Flag bit

D-Field

C-Field

True

D0 - D15

1101

Inverted

D0 - D15

0010

True

D0 - D15

1011

Inverted

D0 - D15

0100

Control Frame Codes

There are 218 control words

provided in 20 bit mode. If the

user desires to send a control

word, his lower 9 bits (D0-D8)

are sent as bits D0-D8 of the D-

Field. The user’s next 9 bits (D9-

D17

) are sent as bits D11-D19 of

the D-Field. The control frame is

either inverted or not inverted as

needed to maintain balance, with

the coding bits 0011 used to

indicate true control, and the bits

1100 used to indicate

complement control. The bits d9

and d10 are always forced to 0 1

for true control frames and 1 0

for complement control frames.

These middle bits are used to

distinguish control frames from

fill frames, which always have the

middle bits set to either 00, 11, or

10. Similarly, there are 214

control words provided in 16 bit

mode.

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