Z85233 Datasheet, PDF (205/317 Pages) Zilog, Inc. – The Zilog SCC Serial Communication Controller

Application Note
The Zilog Datacom Family with the 80186 CPU
SERIAL INTERFACING (Continued)
Table 10. Pin Assignments of Line Driver/Receiver Connectors
J13-J14
J13-J14
J15
J15
Pin # DTE signal
DCE signal
DTE signal
DCE signal
Direction/where used
7
8
/DCD
9
10
GND
11
12
/RxC
13
/TxCO
14
/TxCI
15
16
/RI
/DCD
GND
/RxC
/TxCI
/TxCO
/RI
/DDC
GND
/RxC
/TxCO
/TxCI
/DCD
GND
/RxC
/TxCI
/TxCO
Output to J1B, J2B, J3B
Input from J1A, J2A, J3A, J4
Output to J1B, J2B, J3B
Input from J1A, J2A, J3A
Output to J1-3
Input from J1-3 [3]
Output to J1B, J2B
Input from J1A, J2A
Note:
[3] Various conventions have been used to combine synchronous clock inputs and modem control inputs on Apple Macintosh connectors
similar to J4, as described in a later section.
Comparison of the two preceding charts leads to several
conclusions:
s Pins 1-5 can always be jumpered straight across from a
J5-J10 connector block to a J13-J15 connector block.
s In a synchronous environment, the Transmit clock can
be either driven or received and the Receive clock can
be received from the DTE connector or sent on the DCE
connector.
The 10-pin J11 and J12 jumper blocks provide for
connections to the Port pins of the IUSC and (M)USC,
respectively. As with J5-J10, these connections may be to
the customer’s off-board custom circuits and/or to certain
pins in the J13-J15 blocks. The following pin assignment is
determined so that if a 2-channel USC is plugged into the
(M)USC socket, J12 has the same pin-out for the USC’s B
channel as do J5-J10 for other channels.
Table 11. Pin Assignments of Controller Port Connectors
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
J11: IUSC Signal
PORT1 (Clock 1 In)
PORT4 (Xmit TSA Gate Out)
(N/C)
PORT0 (Clock 0 In)
(N/C)
PORT3 (Rcv TSA Gate Out)
(N/C)
PORT5 (Rcv Sync Out)
PORT2
GND
PORT6 (Rcv Sync In)
PORT7 (Xmit Complete Out)
J12: (M)USC Signal
PORT1
PORT4 (Xmit TSA Gate Out)
(N/C)
PORT0
(N/C)
PORT3 (Rcv TSA Gate Out)
(SYSCLK)
PORT5 (Rcv Sync Out)
PORT2
GND
PORT6 (Rcv Sync In)
PORT7 (Xmit Complete Out)
Finally, an unpopulated 4-pin oscillator socket is included
on the board with its output connected to a single
jumper/wire-wrap pin. This socket can be populated with a
user-supplied oscillator and connected to various clock
pin(s) among J5-J15.
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UM010901-0601