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3
GENERAL ARCHITECTURE OF CC-USB AND ITS USER INTERFACE
The CC-USB presents to the user five internal devices or addresses shown in Table 1:
Table 1. Internal devices of CC-USB and their addresses
Address
1
2
3
4
5
3.1 Register Block
The Register Block of CC-USB is composed of a number of registers identified by sub-
addresses as shown in Table 2:
Table 2. Register sub-addresses and their functionality
Sub-
address
0
1
2
5
6
7
8
10
12
13
3.1.1 Firmware ID Register
This Firmware ID register identifies the acting FPGA firmware in four hexadecimal digits
MYFR, where M and Y represent the month and year of creation, and F and R represent the
firmware and revision numbers, respectively.
3.1.2 Global Mode Register
The global mode register has the following 16-bit structure:
13-15
Unused
WIENER, Plein & Baus GmbH
Device
Register Block (RB)
CAMAC Data Readout Stack (CDS)
CAMAC Scaler Readout Stack (CSS)
CAMAC NAF Generator (CNAF)
Common Output Buffer
Register
Firmware ID
Global Mode
Delays
Scaler Readout Frequency
User LED Source Selector
User NIM Output Source Selector
LAM Mask
Action
CAMAC LAM
Serial Number
12
9-11
Arbitr.
WdgFreq
Note
Read-only
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write – 24-bits in two words
Read/Write
24-bits Read-Only
11 bits, Read-Only
8
6
HeaderOpt
EvtSepOpt
12
4,5
0 - 3
Unused
BuffOpt
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