MAS3549F datasheet(30/92 Pages) MICRONAS

30 / 92 page

MAS 35x9F

DATA SHEET

June 30, 2004; 6251-505-1DS

Micronas

3.3.2.9. Default Read

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.

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.

Example: For watching D1:123 the pointer D0:ffb must

be loaded with 8123hex:

<DW 68 e0 00

write to D0 memory

00 01

1 word to write

0f fb

start address ffb

00 08

value = 8...

01 23>

...0123hex

Now the Default Read commands can be issued as

often as desired:

<DW 69 <DR

Default Read command

dd dd >

16 bit content of the

address as defined by the

pointer

... and do it again

3.3.2.10.Fast Program Download (Code 6hex)

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.

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 EDhex)

–Issue a Run command to start program execution at

entry point of downloaded code

Example for Fast Program Download command:

Download 5 words starting at D0:800,

then download 4 words starting at D1:200:

Freeze

Stop all internal transfers

<DW 68 60 05

initiate download of 5 words

08 00>

start at address D0:800

Now transfer 5 20-bit words via the parallel PIO-port:

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

<DW 68 60 05

initiate download of 4 words

82 00>

start at address D1:200

Now transfer 4 20-bit words via the parallel PIO-port:

d4,d3

d2,d1

d0,d4

d3,d2

d1,d0

d4,d3

d2,d1

d0,d4

d3,d2

d1,d0

switch the memory area

D0:800 ... D0:fff from

data to program usage

start program execution at

address D0:100a

3.3.2.11.Serial Program Download

Program downloads may also be performed via the

I2C-interface by using the Write D0/D1 Memory com-

mands. A similar command sequence as in the Fast

Program Download (Freeze, stop transfers...) applies.

SDW

data_read

d3,d2

d1,d0

SDW

data_write

6,n2

n1,n0

a3,a2

a1,a0

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