CXP Subsystem Registers
Introduction
Version A.0
BitFlow, Inc.
CYT-8-1
CXP Subsystem Registers
Chapter 8
8.1 Introduction
The sections describe the registers used to access the CoaXPress engine on the Kar-
bon-CXP and the Cyton-CXP. Most of these registers are programmed automatically
by the software and are probably only need be accessed under very special circum-
stances.
The Karbon-CXP and the Cyton-CXP both have up to four CXP links. Each link has it’s
own SERDES and associated decode circuitry. In addition, each link can be powered
separately. For this reason there are four identical sets of registers, one for each link.
These link registers are preceded by the link number in order to identify which link
they belong to (see Table 8-1 for example).
It is also important to understand the each VFG has a complete set of these registers.
This means that each VFG on the Karbon-CXP can access all of the links mounted on
the board. The reason is that cameras can be single, dual or quad link. One VFG typi-
cally controls one camera, so each VFG needs access to all the links that belong to the
connected camera.
To illustrate this concept, lets look at the Karbon-CXP4. This has 4 CXP links and 4
VFGs. There are quite a few ways that the cameras can be connected to VFGs. This
board could be connected to four single link camera, in which case each VFG gets
date from one CXP link. It could also be connected to two dual link cameras. In this
case, two VFGs get two CXP links each, and there are two VFGs which are not used
and get no data. The final example is a four CXP link camera, in this case one VFG
gets data from all four links, and the other three VFGs are not used and get no data.
The board is quite flexible, but the software tries to keep things simple and make sure
users to get into too much trouble. In general, the connects between CXP links and
VFGs is automatic, and the user does not have to worry about which links go to which
VFG. The exact same concept holds true for the Cyton-CXP.
Table 8-1 Link Register Example
Register Example Name
CXP Link number
0_POCXP_EN_POWER
0
1_POCXP_EN_POWER
1
2_POCXP_EN_POWER
2
3_POCXP_EN_POWER
3
Содержание Cyton-CXP
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