Zilog Z80230 - Manual (Page 273)

SCC/ESCC
User Manual
UM010903-0515 Application Notes
266
Comparison of the two previous tables leads to following 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 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 cus-
tom circuits and/or to certain pins in the J13-J15 blocks. The following pin assignment is deter-
mined 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 (see Table ).
5 DTR DSR DTR DSR Output to J1-J4
6 DSR DTR DSR DTR Input from J1-J4
7 DCD DCD Output to J1B, J2B, J3B
8 DCD DCD 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 (NOTE)
15 RI Output to J1B, J2B
16 RI Input from J1A, J2A
Note: Various conventions are used to combine synchronous clock inputs and modem control inputson Apple 
Macintosh connectors similar to J4, as described in the later section.
Pin Assignments of Controller Port Connectors
Pin No 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
Pin Assignments of Line Driver/Receiver Connectors (Continued)
Pins
J13-J14
DTE Signal
J13-J14
DCE Signal
J15
DTE Signal
J15
DCE Signal Direction/Where Used