Chapter 2
Channel Operation
page 2 - 12
Excalibur Systems
Read
In receive mode this FIFO register contains the received data information and may
be read as long as the EMT (Channel FIFO Empty) bit is ‘0’. The type of each 16-bit
Word read from the FIFO, can be verified by reading the Receive FIFO Word Type
register immediately after it.
Each received 1600-bit 708 Word block is stored in the FIFO in the following
sequence:
2.3.11
Receive FIFO Read Register
Address:
xx020 (H)
[MSB]
[LSB]
15
0
First
Time Tag Lo
Second
Time Tag Hi
Third
Data [bits 16 -1]
•
•
•
Data [bits 1600 -1585]
103th
Status Word
Figure 2-3
Received 708 Word Block Structure
Bit
Bit Name
Description
00-15
Ttag_Lo
Lower 16 bit of the 32 bit Time_tag value
[resolution 10
μ
sec]
708 Word Receive Block - Time Tag Lo word
Bit
Bit Name
Description
00-15
Ttag_Hi
Upper 16 bit of the 32 bit Time_tag value
708 Word Receive Block - Time Tag Hi word
Bit
Bit Name
Description
01-15
Reserved
Set to 0
00
VW
Valid Word
0 = Not valid (Manchester/bit count error)
1 = Valid
708 Word Receive Block - Status word
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