flash memory, battery backup SRAM & other I/O functions.
Nearly all kinds of I/O functions can be implemented in
this bus.
The I/O expansion bus includes serial & parallel interface.
The parallel interface is very similar to an ISA bus, so the
user can move the old ISA bus design to the I/O expansion
bus with very little modification. The power consumption table
is given as follows:
7188XC
7188XB / XG
7188EX / EG
CPU Module
140mA@5V
260mA@5V
290mA@5V
I/O Expansion
Board
410mA@5V
290mA@5V
260mA@5V
Total Max.
550 mA@5V
550 mA@5V
550 mA@5V
Note:
Power consumption of 7-SEG
LED is 140 mA
For example:
7188XCD=140+140=280
So I/O=550-280=270 mA max.
Note:
The
7188XA(D)
supports I/O expansion bus but does not support
user defined pins, so the 7188XA only supports X002, X003, X560,
X600, X601, X607, X608.
I/O Expansion Bus for 7188X/7188E User’s Manual, Jan/2005 v1.5, 7PH-000-15---6