Zilog EZ80190 - Manual (Page 18)

eZ80190 Development Kit
User Manual
eZ80Acclaim! Development Platform UM014108-0810
14
31 CS0 Input Low Yes
32 CS1 Input Low Yes
33 CS2 Input Low Yes
34 D0 Bidirectional Yes
35 D1 Bidirectional Yes
36 D2 Bidirectional No
37 D3 Bidirectional Yes
38 D4 Bidirectional Yes
39 D5 Bidirectional Yes
40 GND
41 D7 Bidirectional Yes
42 D6 Bidirectional Yes
43 MREQ Bidirectional Low Yes
44 IORQ Bidirectional Low Yes
45 GND
Table 2. eZ80Acclaim!
®
Development Platform
Peripheral Bus Connector Identification—JP1
1
(Continued)
Pin # Symbol Signal Direction Active Level
eZ801900100ZCO
Signal
2
Notes:
1. For the sake of simplicity in describing the interface, Power and Ground nets are omitted from
this table. The entire interface is represented in the eZ80190 Module Schematic Diagrams on
pages 66 through 73.
2. The Power and Ground nets are connected directly to the eZ801900100ZCO device. 
Additional note: external capacitive loads on RD, WR, IORQ, MREQ, D0–D7 and A0–A23 should
be below 10 pF to satisfy the timing requirements for the eZ80
® CPU. All unused inputs should be
pulled to either V
DD
or GND, depending on their inactive levels to reduce power consumption and
to reduce noise sensitivity. To prevent EMI, the EZ80CLK output can be deactivated via software in
the eZ80F91’s Peripheral Power-Down Register.