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© Sealevel Systems, Inc.
4021 Manual | SL9154 11/2021
Card Setup, Continued
Commonly Used DMA Jumper Options
Option
E1
E7
Program 8530
No DMA
None
None
N/A
Single Channel DMA (Half-Duplex Only):
DMA Ch.1 Half Duplex
4,6
4
WAIT/REQ A
DMA Ch.3 Half Duplex.
4,5
2
WAIT/REQ A
Full Duplex using Both DMA Channels 1 and 3:
Ch.A DMA Ch.1 Receive Data
Ch.A DMA Ch.3 Transmit Data
1,4
1,4,6
WAIT/REQ A
DTR/REQ A
Ch.A DMA Ch.3 Receive Data
Ch.A DMA Ch.1 Transmit Data
1,4
2,3,6
WAIT/REQ A
DTR/REQ A
Figure 6 - Commonly Used DMA Options
Remember that E7 positions 7 and 8 enable or disable DMA operation.
Header E5
Header E5 controls the clock input modes for the
ACB 56
. The input clocks for the SCC can be set in either
a non-inverted mode or in an inverted mode for application compatibility.
RC
Normal ‘non
-
inverted’ Receive Clock Input (RTXC).
RI
Inverted Receive Clock Input.
TC
Normal ‘non
-
inverted’ Transmit Clock Input (TRXC).
TI
Inverted Transmit Clock Input.
TN Transmit Clock Input enable.
Figure 7 - Headers E5
RC RI TC TI TN
