MSK Modem
15
MX809
6.4.3 TX One Message, TX Checksum Enabled
RX/TX
A3 A4 A5 A6 C1 C2
H
TX OUTPUT
P1
S1 S2 A1 A2
P2
P
NOTE 2
IRQ
READ STATUS
REGISTER
TX DATA READY
WRITE TO
TX DATA BUFFER
P1
S2 A1 A2 A3 A4 A5 A6
S1
P2
P
CHECKSUM
ON/OFF
TX IDLE
Figure 7: TX One Message, TX Checksum Enabled
Notes:
1. H is the “Hangover bit” (Logic1) appended to the transmitted message before transmission is terminated.
2. Any number of preamble bytes can occur here.
3. Transmission terminates after C1, C2, and H. Termination occurs when no further data bytes are written
to the TX Data Buffer.
6.4.4 TX One Message, TX Checksum Not Enabled.
RX/TX
TX OUTPUT
P1
S1 S2 A1 A2 A3 A4 A5
A
H
P2
P
NOTE 2
NOTE 3
IRQ
READ STATUS
REGISTER
TX DATA READY
WRITE TO
TX DATA BUFFER
P1
S2 A1 A2 A3 A4 A5
A
P2
P
S1
CHECKSUM
ON/OFF
TX IDLE
Figure 8: TX One Message, TX Checksum Not Enabled
Notes:
1. H is the “Hangover bit” (Logic1) appended to the transmitted message before transmission is terminated.
2. Any number of preamble bytes can occur here.
3. Any number of address/data bytes can occur here.
4. Transmission terminates when no further data bytes are loaded into the TX Data Buffer.
ꢀ1998 MX-COM, Inc.
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Doc. # 20480036.004
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