Specifications

60 Élan™SC310 Microcontroller Data Sheet
PRELIMINARY
Maximum ISA Interface versus Local Bus Interface
The maximum ISA interface alternate functions are configured via the DTR and RTS pin states when the ÉlanSC310
microcontroller is reset.
Notes:
See Table 25 on page 56 for information on required termination for Maximum ISA Bus and Local Bus modes.
Table 27. Pins Shared Between Maximum ISA Bus and Local Bus Interface Functions
ISA Interface Pin Name Pin Type ISA Interface Pin Description/Notes
Local Bus Mode Function
Pin Name
Pin No.
BALE
O
ISA Bus Address Latch Enable A12
145
DRQ0
I
DMA Channel 0 Request D/C
171
DRQ3
I
DMA Channel 3 Request M/IO
170
DRQ6
I
DMA Channel 6 Request LRDY
166
DRQ7
I
DMA Channel 7 Request W/R
169
DACK0
O
DMA Channel 0 Acknowledge A16
158
DACK3
O
DMA Channel 3 Acknowledge A15
159
DACK6
O
DMA Channel 6 Acknowledge A13
161
DACK7
O
DMA Channel 7 Acknowledge A14
160
IRQ5
I
Interrupt Request input PULLDN
178
IRQ7
I
Interrupt Request input PULLUP
164
IRQ9
I
Interrupt Request input BHE
168
IRQ10
I
Interrupt Request input PULLUP
179
IRQ11
I
Interrupt Request input BLE
167
LA23–LA17
O
ISA Non-Latched Address Bus A23–A17
149–155
LMEG
O
ISA Memory Address Decode Below 1
Mbyte
CPURDY
147
0WS
I
Zero Wait State ADS
172