Zilog EZ80190 - Manual (Page 17)

eZ80190 Development Kit
User Manual
UM014108-0810 Operational Description
13
16 GND
17 A2 Bidirectional Yes
18 A1 Bidirectional Yes
19 A11 Bidirectional Yes
20 A12 Bidirectional Yes
21 A4 Bidirectional Yes
22 A20 Bidirectional Yes
23 A5 Bidirectional Yes
24 A17 Bidirectional Yes
25 DIS_ETH Output Low No
26 EN_FLASH Output Low No
27 A21 Bidirectional Yes
28 V
DD
29 A22 Bidirectional Yes
30 A23 Bidirectional Yes
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.