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Application Note

The Zilog Datacom Family with the 80186 CPU

9-12

SERIAL INTERFACING (Continued)

Comparison of the two preceding charts leads to several

conclusions:

■ Pins 1-5 can always be jumpered straight across from a

J5-J10 connector block to a J13-J15 connector block.

■ 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.

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.

7 /DCD /DCD Output to J1B, J2B, J3B

8 /DCD /DDC Input from J1A, J2A, J3A, J4

10 GND GND GND GND

11 /RxC /RxC Output to J1B, J2B, J3B

12 /RxC /RxC Input from J1A, J2A, J3A

13 /TxCO /TxCI /TxCO /TxCI Output to J1-3

14 /TxCI /TxCO /TxCI /TxCO Input from J1-3 [3]

15 /RI Output to J1B, J2B

16 /RI Input from J1A, J2A

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

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.

Table 11. Pin Assignments of Controller Port Connectors

Pin # J11: IUSC Signal J12: (M)USC Signal

1 PORT1 (Clock 1 In) PORT1

2 PORT4 (Xmit TSA Gate Out) PORT4 (Xmit TSA Gate Out)

3 (N/C) (N/C)

4 PORT0 (Clock 0 In) PORT0

5 (N/C) (N/C)

6 PORT3 (Rcv TSA Gate Out) PORT3 (Rcv TSA Gate Out)

7 (N/C) (SYSCLK)

8 PORT5 (Rcv Sync Out) PORT5 (Rcv Sync Out)

9 PORT2 PORT2

10 GND GND

11 PORT6 (Rcv Sync In) PORT6 (Rcv Sync In)

12 PORT7 (Xmit Complete Out) PORT7 (Xmit Complete Out)

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