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M66307FP

LINE SCAN BUFFER with 16-BIT MPU BUS COMPATIBLE INPUTS

MITSUBISHI ELECTRIC  

MITSUBISHI 〈DIGITAL ASSP〉

M66307SP/FP

LINE SCAN BUFFER with 16-BIT MPU BUS COMPATIBLE INPUTS

1. Register configuration

The M66307 has the command registers shown in Figure 4. The

mode register consists of a total of eight flags (F0-F7) and seven bits

(B0-B6). Each flag and bit are set to default values (=0) by reset

input.

There are some commands that do not have a register. These in-

clude the one line fixed data setting command, transmit repeat re-

quest command, and the stop command.

2. Command organization

The commands are broadly classified into four groups as shown in

Fig. 3. It shows the relationship between the three modes of the

M66307 (static, write and send modes) and the storable commands.

Group 1

Group 2

Group 3

Group 4

1 Initialization command

2 DREQ words setting command

3 Fixed beginning date length setting command

4 Output format setting command

5 Operation mode setting command

6 One line fixed data setting command

7 Transmit repeat request command

8 Stop command

Command

Group 1 Group 2 Group 3 Group 4

Mode

Static

5

Write

6

Send complete

(BUSY=“H”)

7

Send

Send

(BUSY=“L”)

Note : Command store is valid within

Fig. 3 Command store Map

Description of commands

Command Upper bit

name (D15~D12)

Contents

Initialization 1000

command

This command initializes the hardware setting of the system by selecting clock input and setting the specification for

the use of extension, specification for DREQ output, specification for fixed data output, and the logical polarity of “fixed

data.”

DREQ words 0111 When [N] is set, M66307 outputs a Low from the DREQ pin when setting the write mode. When [N+1] words are

setting command

written by the DMA controller (MPU), it outputs a High from the DREQ pin.

Fixed

beginning

data length

setting

command

Output format

setting command

Operation

mode

setting

command

0110

0100

0000

This command sets the length of fixed beginning data from 3 to 4,095. When [n] is set to the fixed beginning data

length setting register, “fixed data” is output from the DATA OUT pin each time the send mode is entered. When “fixed

data” for [n+1] bits is output, the M66307 starts outputting the data stored in memory. Clock output (CLK/φ OUT), the

clock for synchronization, is output even while fixed data is being output. Note that even when the output format is

LIFO, the data in the internal memory is output after outputting fixed data is completed.

This command sets the output format for LIFO or FIFO and for MSB first or LSB first.

This command is stored in the 4-bit (B3, B2, B1, B0) register shown in Figure 4. The write and send modes are set by

this register. The send mode setting command when an extended 32-bit system is used and the mode inverting

command when an extended toggle system is used are two-word commands. Store the second word after storing the

first word. B3 is a DREQ mask bit. If the write mode is set by setting B3=1 when in the DREQ mode (F4=1), the

M66307 does not output a Low from the DREQ pin. When in the DREQ mode, set B3=1 when setting the write mode

before storing the one line fixed data setting command. It is impossible to control mode inversion with this command

and extended toggle input (TOG) together.

One line fixed 0011

data setting

command

When this command is stored, you obtain the same effect as writing “fixed data” for the set number of words. When set

to the send mode, “fixed data” equivalent to [(fixed beginning data set value+1)+(one line fixed data setting word

value+1)x16] bits is output along with the sync clock (CLK/φ OUT).

Transmit 0010

repeat request

command

This command allows you to resend the same data that has already been sent. This command becomes executable

after transmission is completed. When using an extended system, store the second word of the operation mode

setting command following the transmit repeat request command.

Stop

command

1111

This command stops the operation of the M66307. This command is valid in all modes. It initializes all registers and

circuits except the initialization register, output format setting register, DREQ words setting register, and fixed begin-

ning data length register, thereby placing the M66307 into the static mode. In addition to stopping operation, this

command may be used when you want to store the commands that can only be valid in the static mode (e.g., group 1

and group 2 commands).

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