
1
M66305AP/AFP
TTOGGLE LINE BUFFER
MIMITSUBISHI
DIDIGITAL ASSP
DESCRIPTION
M66305A Toggle Line Buffer has two 5,120-bit line buffer
memories. It takes in serial data that arrives synchronously
with clock pulses and outputs it in serial at a rate of up to 10
Mbits per second synchronously with external clock pulses.
This buffer employs the double buffer system: While data is
being output, data on the next line can be written on the other
line buffer memory.
FEATURES
5,120
×
1bit serial input-serial output line buffer memories
Data transmission at 10 megabits/second maximum
Two line buffer memories can be alternated by external
toggle signal.
Memory capacity can be doubled by cascade connection.
Because of cascade input pin (CAS1), output potential after
completion of output can be set to either H or L.
Low noise and high fan-out output (I
O
=
±
24mA guaranteed)
Every input pin has built-in Schmidt trigger circuit.
Read counter and write counter can be reset independently.
RESET, T, CNTRST1 and CNTRST2 are equipped with
negative noise reduction circuit.
APPLICATION
Data buffer between industrial or home-use image data pro-
cessing system and peripheral equipment
PIN CONFIGURATION (TOP VIEW)
BLOCK DIAGRAM
T
ICE
SICLK
SIDATA
CAS1
CNTRST2
CNTRST1
RESET
CS
INT
OCE
SOCLK
SODATA
BF
TOGGLE SIGNAL
INPUT
INPUT CLOCK
ENABLE
INPUT CLOCK
INPUT DATA
CASCADE INPUT 1
READ COUNTER
RESET INPUT
WRITE COUNTER
RESET INPUT
RESET INPUT
CHIP SELECT
INPUT
WRITE REQUEST
OUTPUT
OUTPUT CLOCK
ENABLE
OUTPUT CLOCK
OUTPUT DATA
BUFFER FULL
OUTPUT
Matching
detection circuit
Read counter
Write register
Write counter
Switch
and P.G.
A
5120 bits
5120 bits
A
D
D
I
D
0
A
D
D
I
D
0
Toggle F/F
D
Data
buffer
WR
WR
S-RAM
S-RAM
9
12
13
1
2
3
4
5
6
7
8
10
11
24
23
22
21
20
19
18
17
16
15
14
9
10
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
GND
SICLK
SIDATA
ICE
CAS1
GND
T
CS
RESET
GND
V
CC
SODATA
SOCLK
OCE
CAS2
CNTRST2
CNTRST1
V
CC
BF
INT
INPUT CLOCK
INPUT DATA
INPUT CLOCK ENABLE
CASCADE INPUT 1
TOGGLE SIGNAL INPUT
CHIP SELECT INPUT
RESET INPUT
OUTPUT DATA
OUTPUT CLOCK
OUTPUT CLOCK ENABLE
CASCADE INPUT 2
READ COUNTER RESET INPUT
WRITE COUNTER RESET INPUT
(5V)
BUFFER FULL OUTPUT
WRITE REQUEST OUTPUT
Outline 20P4
Outline 24P2W-A
NC: No Connection
M
M
GND
SICLK
SIDATA
ICE
CAS1
NC
NC
GND
T
CS
RESET
GND
V
CC
SODATA
SOCLK
OCE
CAS2
NC
NC
CNTRST2
CNTRST1
V
CC
BF
INT
INPUT CLOCK
INPUT DATA
INPUT CLOCK ENABLE
CASCADE INPUT 1
TOGGLE SIGNAL INPUT
CHIP SELECT INPUT
RESET INPUT
OUTPUT DATA
OUTPUT CLOCK
OUTPUT CLOCK ENABLE
CASCADE INPUT 2
READ COUNTER RESET INPUT
WRITE COUNTER RESET INPUT
(5V)
BUFFER FULL OUTPUT
WRITE REQUEST OUTPUT