Motorola MVME172 用户手册
LCSR Programming Model
http://www.mcg.mot.com/literature
2-61
2
DMAC Byte Counter
In the direct mode, this counter is programmed with the number of bytes
of data to be transferred.
of data to be transferred.
Table Address Counter
In the command chaining mode, this counter should be loaded by the
processor with the starting address of the list of commands. This register
gets reloaded by the DMAC with the starting address of the current
command. The last command in a list should have bits 0 and 1 set in the
next command pointer.
processor with the starting address of the list of commands. This register
gets reloaded by the DMAC with the starting address of the current
command. The last command in a list should have bits 0 and 1 set in the
next command pointer.
VMEbus Interrupter Control Register
ADR/SIZ
$FFF40040 (32 bits)
BIT
31
. . .
0
NAME
DMAC Byte Counter
OPER
R/W
RESET
0 PS
ADR/SIZ
$FFF40044 (32 bits)
BIT
31
. . .
0
NAME
Table Address Counter
OPER
R/W
RESET
0 PS
ADR/SIZ
$FFF40048 (8 bits [7 used] of 32)
BIT
31
30
29
28
27
26
25
24
NAME
IRQ1S
IRQC
IRQS
IRQL
OPER
R/W
S
R
S
RESET
0 PS
0 PS
0 PS
0 PS