Kenwood DP-1100 B Service Manual page 89

D P - 1 1 0 0 B II
2. IC OPERATION OF EACH CIRCUIT AND PIN DESCRIPTION
Pin functions
Pin No. Symbol
27, 61
28, 62,
67
2 PBFS
3 MWRE
4 BOEN
AD0—AD9, AD0—AD9,
5 - 1 4 , 5 - 1 4 ,
AD10 AD10
18 18
15 R/W
16 CE2
17 CE1
I / 0 - 7 - I / 0 - 7 - I / 0 - 7 -
1 9 - 2 6 1 9 - 2 6 1 9 - 2 6
l/O-O l/O-O l/O-O
92
I/O Waveform
- -
Voltage supply pin
\
-
GND pin
Frame sync input. The symbol data period signal of each frame sent
I
—
from TC9178F (IC8) is input.
Memory write request input which accepts MWRE signal from
I
—
TC9178F (IC8)
Output enable. When signal MWRE from TC9178F (IC8) can be ac­
-
0 cepted, the control signal to release symbol data output DBOO to
DB07 from Hi-impedance state is output.
\ \ 5 V 5 V
1
0.2 0.2
External RAM address data output. Connected to address data input External RAM address data output. Connected to address data input
0 0
/ / OV OV
of external RAM. of external RAM.
0.
M S
Read/write signal output to external RAM. Connected to R/W input of
ft
external RAM.
0
" L " = Read, " H " = Write
3.4 nS
Chip enable 2 signal is output when external RAM is read or written.
0
Connected to CE2 input of external RAM.
Chip enable 1 signal is output when external RAM is read or written.
0
Connected to CE1 input of external RAM.
0.48 nS
J0.2 /tS
Data bus line connected to l/O-O to 7 of external RAM and DB04 Data bus line connected to l/O-O to 7 of external RAM and DB04 Data bus line connected to l/O-O to 7 of external RAM and DB04
I/O I/O I/O
\ / u V
-DB07. -DB07. -DB07.
1 nS
Description
T a b l e 2 - 3 - 4 A
Remarks
Connected to PBFS
(pin 56) of TC9178F
(IC8)
Connected to MWRE
(pin 67) of TC9178F
(IC8)
Connected to BUSE
(pin 66) of TC9178F
(IC8)
Not connected