参数资料
型号: MAS3587F
厂商: Electronic Theatre Controls, Inc.
元件分类: 通用总线功能
英文描述: MPEG Layer 3 Audio Encoder/Decoder
中文描述: MPEG层3音频编码器/解码器
文件页数: 31/83页
文件大小: 734K
代理商: MAS3587F
ADVANCE INFORMATION
MAS 3587F
Micronas
31
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
hex
)
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:
(stop all data transfers)
<DW 68 00 00>
<DW 68 60 04
10 00>
initiate download of 4 words
start at address D0:1000
Now transfer 8-bit words via the parallel PIO port:
0,0 0,d4 d3,d2 d1,d0
0,0 0,d4 d3,d2 d1,d0
0,0 0,d4 d3,d2 d1,d0
0,0 0,d4 d3,d2 d1,d0
<DW 68 be d0 00 03>
reconfigure memory from
D0:1000 to D0:17ff
<DW 68 10 00>
start program execution at
address D0:1000
3.3.1.15. Serial Program Download
Program downloads may also be performed via the I
2
C interface by using the Write D0/1 Memory commands. A sim-
ilar command sequence as in the Fast Program Download (stop transfers,
Freeze..
.) applies.
S
DW
A
W
$69
A
W
6
,n2
A
W
P
A
n1,n0
a3,a2
A
W
A
a1,a0
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