Chapter 4
Receive/ Monitor Mode
page 4 - 14
Excalibur Systems
4.5
Receive Channel Control Registers
The Channel
x
Configuration register sets up the run parameters for both the
receive and transmit channels (See
Channel x Configuration Register,
page 3-3 in
Chapter 3: Transmit Mode
). Bits which are unused (e.g. transmit-related bits for a
receiver channel) are ignored by the module.
Note:
1. It is recommended that you set up
all
[active channel] Configuration
Registers before programming any other parameters.
2. You can only write to this register when
all
channels are turned
off
(via
the Start Register).
3. You should “start” the module (via the Start Register) only after a
minimum of 500
µ
sec from the time that the contents of this register
have been modified.
4. Receiver Label Trigger (see See
Channel x Receive Label Trigger Register,
page 4-17).
5. The selected speed for channels 0 and 1 must be the same. Similarly,
the selected speed for channels 3 and 4 must be the same. Therefore,
bit 00 of the Channel Configuration Register is not used for channels
1 and 4.
4.5.1
Channel x Configuration Register
Bit
Bit Name
Description
10-15
0
09
Receiver Enable
Filter Table
1 = Enable Filter Table (Stores labels per table)
0 = Disables table. Stores all labels.
08
0
07
Receiver Label
Trigger
1 = Start data storage upon receipt of Label xx.
0 = Receiver stores data without Start Label Trigger (see
Note 4 below)
06
Receiver Wrap
Around
1 = Data storage is halted when the buffer is full.
0 = Receiver wraps around the data in the block. This bit is
used in the Sequential Storage Mode only (See
Sequential/Merge Mode Operation,
page 4-3).
05
Receiver Storage
Mode
1 = Sequential Storage Mode
0 = Look-up Table Mode (See
Channel x Receive Look-up
Table Start Address,
page 4-15).
03-04
0
02
Transmit Rise/
Fall Time
Not used in Receive mode
01
0
00
Bit Rate
1 = 12.5 KHz (Lo speed)
0 = 100 KHz (Hi speed)
Available for channels 0 and 3 only (see Note 5 below).
Channel x Configuration Register – Receive Mode
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