MAS 35x9F
DATA SHEET
3.3.2.9. Default Read
– Issue a Run command to start program execution at
entry point of downloaded code
The Default Read command is the fastest way to get
information from the MAS 35x9F. Executing the
Default Read in a polling loop can be used to detect a
special state during decoding.
Example for Fast Program Download command:
Download 5 words starting at D0:800,
then download 4 words starting at D1:200:
<DW 68 00 00>
Freeze
S
DW
W
A
data_read
A
S
DR
W
A
A
d3,d2
d1,d0
W
N
P
<DW 68 b3 b0 03 18>Stop all internal transfers
<DW 68 b4 30 03 00>
The Default Read command immediately returns the
lower 16 bit content of a specific RAM location as
defined by the pointer D0:ffb. The pointer must be
loaded before the first Default Read action occurs. If
the MSB of the pointer is set, it points to a memory
location in D1 rather than to one in D0.
<DW 68 b4 b0 00 00>
<DW 68 b5 30 03 18>
<DW 68 b6 b0 00 00>
<DW 68 bb b0 03 18>
<DW 68 bc 30 03 00>
<DW 68 b0 60 00 00>
<DW 68 60 05
08 00>
initiate download of 5 words
start at address D0:800
Example: For watching D1:123 the pointer D0:ffb must
be loaded with 8123
:
hex
Now transfer 5 20-bit words via the parallel PIO-port:
<DW 68 e0 00
00 01
write to D0 memory
1 word to write
start address ffb
value = 8...
d4,d3 d2,d1 d0,d4 d3,d2 d1,d0
d4,d3 d2,d1 d0,d4 d3,d2 d1,d0
d4,d3 d2,d1 d0,x
0f fb
00 08
01 23>
...0123
hex
<DW 68 60 05
82 00>
initiate download of 4 words
start at address D1:200
Now the Default Read commands can be issued as
often as desired:
Now transfer 4 20-bit words via the parallel PIO-port:
<DW 69 <DR
Default Read command
16 bit content of the
address as defined by the
pointer
dd dd >
d4,d3 d2,d1 d0,d4 d3,d2 d1,d0
d4,d3 d2,d1 d0,d4 d3,d2 d1,d0
<DW 69 <DR dd dd > ... and do it again
<DW 68 b6 bc 00 00>switch the memory area
D0:800 ... D0:fff from
3.3.2.10.Fast Program Download (Code 6
)
hex
data to program usage
<DW 68 10 0a>
start program execution at
address D0:100a
S
DW
W
A
data_write
A
6,n2
A
A
n1,n0
a1,a0
W
A
a3,a2
W
A
P
The Fast Program Download command introduces a
data transfer via the parallel port. n = n2,n1,n0
denotes the number of 20-bit data words to be trans-
ferred, a = a3,a2,a1,a0 gives the start address. The
data must be organized in two times five nibbles to get
two words of 20-bit length. If the number n of 20-bit
data words is odd, the very last word has to be padded
with one additional nibble.
3.3.2.11.Serial Program Download
Program downloads may also be performed via the
2
I C-interface by using the Write D0/D1 Memory com-
mands. A similar command sequence as in the Fast
Program Download (Freeze, stop transfers...) applies.
The download must be initiated in the following order:
– Issue Freeze command
– Stop all DMA-transfers
– Issue Fast Program Download command
– Download code via PIO-interface
– Switch appropriate memory area to act as program
RAM (register ED
)
hex
30
June 30, 2004; 6251-505-1DS
Micronas
MICRONAS [ MICRONAS ]
