WIENER, Plein & Baus GmbH
12
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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 Device
1
Register Block (RB)
2
CAMAC Data Readout Stack (CDS)
3
CAMAC Scaler Readout Stack (CSS)
4
CAMAC NAF Generator (CNAF)
5
Common Output Buffer
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
Register Note
0 Firmware
ID
Read-only
1
Global Mode
Read/Write
2 Delays
Read/Write
5
Scaler Readout Frequency
Read/Write
6
User LED Source Selector
Read/Write
7
User NIM Output Source Selector Read/Write
8
LAM Mask
Read/Write – 24-bits in two words
10 Action
Read/Write
12 CAMAC
LAM
24-bits
Read-Only
13
Serial Number
11 bits, Read-Only
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
12
9-11
8
6
4,5
0 - 3
Unused Arbitr. WdgFreq HeaderOpt EvtSepOpt Unused BuffOpt
