5. I/O Expansion Bus
The I/O expansion bus of 7188X/7188E series can be divided
into 3 groups as follows:
1.
Power supply & reset signals: VCC, GND, RESET,
/RESET
2. Parallel Bus:
System clock: CLOCKA
Asynchronous ready control: ARDY
Address bus: A0 ~ A6, A7 (7188XC & 7521 series without
A7)
Data bus: D0 ~ D7
Interrupt control: INT0, INT1, INT4 (7188XC & 7521 series
without INT4)
Chip select & read/write strobe: /CS, /WR, /RD
3. Serial Bus: TO_0, TO_1, TI_0, TI_1, SCLK, DIO9, DIO4,
DI
I/O Expansion Bus for 7188X/7188E User’s Manual, Jan/2005 v1.5, 7PH-000-15---20