MAS3587F Micronas, MAS3587F Datasheet - Page 31

• Manufacturer Part Number: MAS3587F
• Description: MPEG Layer 3 Audio Encoder/Decoder
• Manufacturer: Micronas

ADVANCE INFORMATION
3.3.1.14. Fast Program Download
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 transferred, a = a3,a2,a1,a0 gives the start address. The data at the PIO port
must be padded with three 0-nibbles to get multiples of 16 bits.
The download must be initiated in the following sequence:
– 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
– Issue Run command to start program execution at entry point of downloaded code
Example for Fast Program Download command:
Download 4 words starting at D0:1400:
<DW 68 00 00>
<DW 68 60 04
Now transfer 8-bit words via the parallel PIO port:
0,0
0,0
0,0
0,0
<DW 68 be d0 00 03>
<DW 68 10 00>
3.3.1.15. Serial Program Download
Program downloads may also be performed via the I
ilar command sequence as in the Fast Program Download (stop transfers, Freeze...) applies.
Micronas
S
10 00>
DW
0,d4
0,d4
0,d4
0,d4
W
d3,d2
d3,d2
d3,d2
d3,d2
A
$69
d1,d0
d1,d0
d1,d0
d1,d0
(stop all data transfers)
W
)UHH]H
initiate download of 4 words
start at address D0:1000
reconfigure memory from
D0:1000 to D0:17ff
start program execution at
address D0:1000
A
a3,a2
6,n2
A
A
n1,n0
a1,a0
2
C interface by using the Write D0/1 Memory commands. A sim-
W
W
A
A
P
hex
)
MAS 3587F
31