
BCRTM-38
F
ig
u
re
2
.
B
u
s
C
o
n
tr
o
ll
e
r
S
c
en
a
r
io
R
T
I
2
R
T
I
2
R
T
I
2
R
T
I
2
*
S
T
A
T
U
S
D
A
T
A
4
D
A
T
A
3
D
A
T
A
2
D
A
T
A
1
S
T
A
T
U
S
C
M
D
#
2
C
M
D
#
1
R
T
I
2
R
T
I
1
B
C
B
C
S
T
A
T
U
S
D
A
T
A
4
D
A
T
A
3
D
A
T
A
2
D
A
T
A
1
S
T
A
T
U
S
C
M
D
#
2
C
M
D
#
1
R
T
I
2
R
T
I
1
B
C
B
C
M
A
N
C
H
E
S
T
E
R
D
A
T
A
B
U
S
A
M
A
N
C
H
E
S
T
E
R
D
A
T
A
B
U
S
B
IN
T
E
R
U
P
T
A
C
T
IV
IT
Y
B
C
R
T
M
A
C
T
IV
IT
Y
D
E
S
C
R
IP
T
IO
N
R
T
I
2
R
T
I
2
R
T
I
2
R
T
I
2
B
C
R
T
M
D
M
A
U
T
O
R
E
T
R
Y
D
E
S
C
R
IP
T
IO
N
A
C
T
IV
IT
Y
B
C
R
T
M
A
C
T
IV
IT
Y
B
C
R
T
M
D
M
A
IN
T
E
R
U
P
T
D
A
T
A
B
U
S
B
M
A
N
C
H
E
S
T
E
R
D
A
T
A
B
U
S
A
M
A
N
C
H
E
S
T
E
R
B
C
R
T
I
B
C
B
C
M
D
A
T
A
1
D
A
T
A
2
S
T
A
T
U
S
*
TIME OUT TO 400 S
FETCH TAIL POINTER
STORE STATUS WORD #2
STORE DATA WORD#4
STORE DATA WORD #3
STORE DATA WORD#2
STORE DATA WORD#1
STORE STATUS WORD #1
FETCH COMMAND WORD #2
FETCH DATA POINTER
FETCH COMMAND WORD #1
FETCH CONTROL WORD
READ LOG LIST TAIL PTR
STORE CMD BLOCKPTR
STORE INTERRUPT STATUS WORD
RECOGNIZE ME BIT
STORE STATUS WORD #2
STORE DATA WORD#4
STORE DATA WORD#3
STORE DATA WORD #2
STORE DATA WORD#1
STORE STATUS WORD #1
FETCH COMMAND WORD #2
FETCH DATA POINTER
FETCH COMMAND WORD #1
FETCH CONTROL WORD
START BCRTM
INITIALIZE REGISTERS
SO STOP BCRTM
EOL IN CONTROL WORD
STORE INTERRUPT STATUS WORD
FETCH DATA WORD #2
FETCH DATA WORD#1
FETCH DATA POINTER
FETCH COMMAND WORD
FETCH CONTROL WORD
TIME OUT TO 400 s
N
o
te
s:
1
.
T
im
es
fo
r
D
M
A
rb
it
ra
ti
o
n
an
d
B
C
R
T
M
D
M
A
ct
iv
it
ie
s
ar
e
n
o
ts
h
o
w
n
to
sc
al
e
re
la
ti
v
e
to
th
e
1
5
3
B
m
es
sa
g
e
w
o
rd
le
n
g
th
s.
T
h
is
d
o
n
e
to
il
lu
st
ra
te
th
e
o
p
er
at
io
n
o
f
th
es
e
si
g
n
al
s.
2
.
*
=
re
sp
o
n
se
ti
m
e
o
f
4
to
1
2
s.
3
.
D
M
A
rb
it
ra
ti
o
n
re
p
re
se
n
ts
th
e
D
M
A
R
↓
to
D
M
A
C
K
↑
se
q
u
en
ce
.
4
.
T
h
e
sc
en
ar
io
as
su
m
es
th
at
al
l
D
M
A
g
ra
n
ts
(D
M
A
G
)
ar
e
re
ce
iv
ed
in
th
e
re
q
u
ir
ed
p
er
io
d
o
f
ti
m
e.
5
.
T
h
es
e
ti
m
es
d
ep
en
d
o
n
th
e
D
M
A
G
re
sp
o
n
se
ti
m
e.
0
s
1
6
8
to
1
7
5
to
4
8
4
to
4
9
2
s
4
0
s
3
4
to
3
9
2
s
4
0
s
B
C
R
T
M
D
M
A
R
B
IT
R
A
T
IO
N
3
B
C
R
T
M
D
M
A
R
B
IT
R
A
T
IO
N
3