HDSP-390X Agilent(Hewlett-Packard), HDSP-390X Datasheet - Page 25

• Manufacturer Part Number: HDSP-390X
• Description: 20 mm (0.8 inch) Seven Segment Displays
• Manufacturer: Agilent(Hewlett-Packard)

HDMP-1012 (Tx), HDMP-1014 (Rx)
Operating Modes
Control Frame Codes
There are 2
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
HDMP-1012 (Tx), HDMP-1014 (Rx)
Data Frame Structure
M20SEL Not Asserted (16 bit data mode)
HDMP-1012 (Tx), HDMP-1014 (Rx)
Data Frame Structure
M20SEL Asserted (20 bit data mode)
M20SEL
Data Status
Data Status
Inverted
Inverted
Inverted
Inverted
0
0
1
1
True
True
True
True
18
control words
FLAGSEL
0
1
0
1
Flag bit
Flag bit
0
0
1
1
0
0
1
1
16 bit data plus error checking
16 bit data plus FLAG
20 bit data plus error checking
20 bit data plus FLAG
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
D-Field
D
D
D
D
D-Field
D
D
D
D
0
0
0
0
0
0
0
0
Description
- D
- D
- D
- D
- D
- D
- D
- D
15
15
15
15
19
19
19
19
C-Field
C-Field
1101
0010
1011
0100
1101
0010
1011
0100
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 2
control words provided in 16 bit
mode.
14
597