CPP100
SECTION 6
CPP1OPS
25/10/06
www.snellwilcox.com
Version 1 Issue 6
6.19
HANC: Horizontal Ancillary Header
The HANC header is as specified in REC656 as a 3 byte header in the form 000 3FF 3FF.
DID: Data Ident
The DID consists of 10 bits, of which 8-bits carry the identification value and the remaining
bits carry even parity and its inverse as shown:
bits b7 (MSB) - b0 (LSB) form the identification value (00h - FFh)
bit b8 is even parity for b7 - b0
bit b9 = not b8
DID words
Some DID words such as EDH are “Internationally Registered” and are unavailable for
selection.
Words in the range C0h to DFh are available for user application and may be assigned
for use in Prefix as shown in the table below.
DID
10-bit
DID
8-bit
C0
✔
C1-C3
✘
C4
✔
C5-C7
✘
C8
✔
C9-CB
✘
CC
✔
CD-CF
✘
D0
✔
D1-D3
✘
D4
✔
D5-D7
✘
D8
✔
D9-DB
✘
DC
✔
DD-DF
✘
To retain 8-bit compatibility the range of allowed values is restricted to the entries
marked with a tick.
