HDMP-1032 Datasheet, PDF (30/32 Pages) Agilent(Hewlett-Packard) – 1.4 GBd Transmitter/Receiver Chip Set with CIMT Encoder/Decoder and Variable Data Rate

Nomenclature Changes between
HDMP-1032/34 and HDMP-1022/24
In previous versions of G-Link
such as the HDMP-1022/24 each
parallel unit of data was called a
frame. This has been changed to
a word with the HDMP-1032/34.
Frame usually stands for a series
of words that form a logical unit.
For example, each unit of PPP
unit is called a frame. It consists
of a header and a checksum at
the end.
The encoded 20 bit entity for the
HDMP-1022/24 was composed
of a data field and also a control
field. This was confusing because
the data field contained data
frames and control frames. In
other words control and data
were used in two different con-
texts which left the reader to
identify which of the two mean-
ings was meant. The encoded
word was split into a word field
and an encoding field.
With the HDMP-1032/34 we
have:
• control words
• data words
• word field
• ¢ where one may find control
words or data words
• encoding field
In addition with the HDMP-1032/
34, fill frames have been changed
to
idle words following the custom
used in Fibre Channel and Giga-
bit Ethernet where idles are in-
serted
if no information is being fed to
the transmitter.
Pin names have been changed
to specify if they belong to the
transmitter (Tx) or the receiver
(Rx). In addition, some names
have been changed to names
analogous to those used in Fibre
Channel and Gigabit Ethernet.
Examples are TXCLK instead of
STRBIN and RXCLK instead of
STRBOUT. A pin cross reference
table for the HDMP-1032/34 &
HDMP-1022/24 is provided in the
table on the next page.
30