ELANSC310 datasheet(60/119 Pages) AMD

60 / 119 page

Élan™SC310 Microcontroller Data Sheet

PREL IMINARY

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

ISA Bus Address Latch Enable

A12

145

DRQ0

DMA Channel 0 Request

D/C

171

DRQ3

DMA Channel 3 Request

M/IO

170

DRQ6

DMA Channel 6 Request

LRDY

166

DRQ7

DMA Channel 7 Request

W/R

169

DACK0

DMA Channel 0 Acknowledge

A16

158

DACK3

DMA Channel 3 Acknowledge

A15

159

DACK6

DMA Channel 6 Acknowledge

A13

161

DACK7

DMA Channel 7 Acknowledge

A14

160

IRQ5

Interrupt Request input

PULLDN

178

IRQ7

Interrupt Request input

PULLUP

164

IRQ9

Interrupt Request input

BHE

168

IRQ10

Interrupt Request input

PULLUP

179

IRQ11

Interrupt Request input

BLE

167

LA23–LA17

ISA Non-Latched Address Bus

A23–A17

149–155

LMEG

ISA Memory Address Decode Below 1

Mbyte

CPURDY

147

0WS

Zero Wait State

ADS

172

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