Zilog Z16C35 - Manual (Page 222)

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
9
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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UM011002-0808
UM011001-0601