EZ80F917050SBCG Datasheet, PDF (16/30 Pages) Zilog, Inc. – Factory-default operating clock frequency at 50 MHz

Zdots^® SBC for eZ80AcclaimPlus!^™ Connectivity ASSP
Product Specification
12
Onboard Component Description
Logic-Level Input/Outputs
The I/O connector features 32 general-purpose 3.3 V CMOS I/O pins that can be used as
outputs or inputs interfacing to external logic. All I/Os are 5 V tolerant. Some of the gen-
eral-purpose I/O pins support dual mode functions (SPI, Timer I/O, UARTs, and bit I/O
with edge- or level-triggered interrupt functions on each pin). For more information on
eZ80AcclaimPlus!^™ ASSP dual modes, refer to eZ80F91 Product Specification
(PS0192).
Onboard Battery Backup
An onboard Panasonic VL-1220-1VC 3 V Lithium battery powers the 32 kHz
real-time clock when external power is removed. The battery is charged through diode
CR1 and resistor R28 when external power is applied to the board.
Ethernet PHY and RJ45 Connector
The Zdots^® contains Advanced Micro Devices’ Am79C874 Media-Independent Interface
(MII) and a HALO RJ45 with integrated magnetics (transformer and common-mode
chokes) and two LED indicators.
The MII enables different modes of Ethernet communication, configurable by resistors
R19, R21, R23, and R24. The Zdots is shipped with all four resistors installed. Table 3
lists the available resistor settings and is excerpted from the Am79C874 data sheet pub-
lished by AMD.
Table 3. Zdots MII Resistor Configuration
R24
ANEG
IN
IN
IN
IN
IN
IN
R19
R23
R21
(Tech[2]) (Tech[1]) (Tech[0]) Speed Full-Duplex ANEG-EN Capabilities
IN
IN
IN
Yes¹
Yes¹
No
All
IN
IN
OUT No
No
No
10HD
IN
OUT
IN
No
No
No
100HD
IN
OUT
OUT
IN
OUT
IN
No
Yes¹
No
Yes¹
No
100HD
No
All
OUT
IN
OUT No
No
No
10FD
ANEG
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
PS026102-1207
Onboard Component Description