MX429A データシートの表示（PDF） - MX-COM Inc
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MX429A Datasheet PDF : 20 Pages
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1200/2400bps MSK Modem for Trunked Radio Systems
12
5.3 Transmit Operation
MX429A
(a) Tx - one message with checksum supplied by host
Tx ENABLE
(2)
Tx INPUT
P1
P2
Pn
S1
S2
A1
A2
A3
A4
A5
A6
C1
IRQ OUTPUT
Tx DATA
READY
WRITE TO Tx
DATA BUFFER
READ STATUS REGISTER
Tx PARITY
ENABLE
S1 S2
A1
A2
A3
A4
A5
A6
C1
C2
(1)
C2 H (2)
(3)
Tx IDLE
(b) Tx - one message with checksum generated internally
Tx ENABLE
(2)
Tx INPUT
P1
P2
IRQ OUTPUT
Tx DATA
READY
WRITE TO Tx
DATA BUFFER
READ STATUS REGISTER
Tx PARITY
ENABLE
(1)
Pn
S1
S2
A1
A2
A3
A4
A5
A6
C1
C2 H (2)
(3)
S1 S2
A1
A2
A3
A4
A5
A6
Tx IDLE
(c) Tx - more than one message, with checksum generated internally
Tx ENABLE
Tx INPUT
(2)
P1 P2
Pn S1 S2 A1 A2 A3 A4 A5 A6 C1 C2 S1 S2 A1 A2 A3 A4 A5 A6 C1 C2 S1
IRQ OUTPUT
Tx DATA
READY
WRITE TO Tx
DATA BUFFER
READ STATUS REGISTER
Tx PARITY
ENABLE
S1 S2 A1 A2 A3 A4 A5 A6 S1
S2 A1 A2 A3 A4 A5 A6 S1
Tx Parity Enable is 'Low' - indicating that the
SYNC/SYNT word is not to be included in the
next checksum
Notes:
A - Address Code
C - Checksum
D - Data Code
H - Hang Bit
P - Preamble
S - SYNC/SYNT
(1) - Tx Output at bias level
(2) - Tx Output at High Impedance
(3) - If Tx Data Ready is Set here, it inhibits Tx Data Ready
Interrupt - The Tx Idle Interrupt occurs 1 bit later
A6 C1 C2 D1 D2 D3 D4 D5 D6 C1 C2 H
Tx INPUT
D1
D2 D3 D4 D5 D6
IRQ OUTPUT
Tx DATA
READY
WRITE TO Tx
DATA BUFFER
READ STATUS
REGISTER
Tx Parity Enable remains 'High' - indicating that
all following data is to be included in the checksum
Tx PARITY
ENABLE
Tx IDLE
Figure 6: Transmit Operation
© 1998 MX-COM Inc.
www.mxcom.com Tel: 800 638-5577 336 744-5050 Fax: 336 744-5054
Doc. # 20480128.007
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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