Commodore Amiga - Page 282

21 GND
22 GND
23 +5V
24
100 rna maximum. *** WARNING +SV. ***
25 RESET* 0
Jlmiga system reset
PARALLEL CONNECTOR INTERFACE TIMING, OUTPUT CYCLE
PA<7:0> _________________ --:
PB<7:0>---X X--
1<-- Tl --->1 1
1
1<-------- T2 ------>1
V V, _______________ __
DRDY* -----------1 1
Output data ready 1 < - T3 - > 1
1<--- T4 --->1
___________________ 1 <- T5 --> 1 ______ _
JItCK* 1 1
Output data acknowledge
Microseconds
Min Typ Max
Tl: 4.3 -x- 5.3
;t'2: nsp -x- upc
T3: nsp 1.4 nsp
T4: 0 -x- upc
T5: nsp -x- upc
nsp = not specified
Output data setup to ready delay.
Output data hold time.
Output data ready width.
Ready to acknowledge delay.
Acknowledge width.
upc = under program control
PARALLEL CONNECTOR INTERFACE TIMING, INPUT CYCLE
PA<7:0> _________________ --:
PB<7:0>---X L
1<-- Tl --->1
1 T2 --> 1 <-----> I·
___________ V ____ 1 ______ _
JItCK*
1--- 1
Input data ready
1<- T3 ->1 1
1<-- T4 --->1
__________________ 1 <- T5 --> 1 ______ _
DRDY*
Input data acknowledge
Microseconds
Min Typ Max
Tl: 0 -x- upc
T2: nsp -x- upc
T3: nsp -x- upc
T4: upc -x- upc
T5: nsp 1.4 nsp
1 1
Input data setup time.
Input data hold time.
Input data ready width.
Input data ready to data
acknowledge delay.
Input data acknowledge width.
nsp = not specified
upc = under prograJl' control
SERIAL INTERFACE CONNECTOR SPECIFICATION
This 25-pin D-type connector with sockets (DB25S=female) is used to
interface to RS-232-C standard signals. Signal names correspond to
those used in other places in this appendix, when possible.
WARNING: Pins 14, 21 and 23 carry pOwe:'". Do not connect to these
pins inadvertently because they can permanently damage external
equipment. Alsc, pins l5-le, 23-25 carry non-standard signals a,nd
should not be connected. NEVER use a fully wired 25 line cablel
SERIAL INTERFACE CONNECTOR PIN ASSIGNMENT (J6)
PIN NAME
1 FGND
2 TXD
3 RXD
4 RTS
5 CTS
6 OS1\.
7 GND
e CD
S
10
11
12
13
RS-232-C
DI1\ STD NOTES
Y Frame ground -- do not tie to logic ground
o y Transmit data
I y Receive data
o y Request to send
I y Clear to senG
I y Data set ready
y Signal ground -- do not tie to frame ground
I y Carrier detect
n
n
y
n
n
-;>14 -SV
r 15 AUOO
n* 50 rna maximwr u* WARNING -SV *u
o n* Audio output from left (channels 0, 3) port,
intended to send audio to the modem.
16 AUDI
17 EH
...
18
INT2*
1S
20 DTR
~21
+5V
22
1-+23'1 +l2V
.; 24 I C2*
? I
;
I n* Audio input to right (channels 1, 2) port,
0
n*
I
n·
n
0
Y
nt
n
n*
0
n*
intended to receive audio from the modem; this
input is mixed with the analog output of the
right (channels 1,2). It is not digitized o~
used by the collputer in any way.
716 KHz clock that supports 68000 peripheral
transfers, intended for modem interface; this is
the buffered version of the E clock from the 68000.
Asserting this OPEN COLLECTOR signal will generate
a level 2 interrupt to the 68000 if it is enabled.
Data terminal ready.
100 rna maximun:
***
WARNING +5V ***
50
rna maximwr.
***
WARNING +12V ***
3.58 MHz intended for modems that need a
colorburst clock.