ELANSC310 datasheet(61/119 Pages) AMD

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Élan™SC310 Microcontroller Data Sheet

PREL IMINARY

ALTERNATE PIN FUNCTIONS SELECTED VIA FIRMWARE

The following tables contain brief descriptions of the alternate pin functions/names and the pin names of the default

function that the alternate function replaces. These alternate functions are selected via system firmware only.

SRAM Interface

This alternate function is configured by setting bit 0 of the Miscellaneous 6 Register, Index 70h.

Unidirectional/Bidirectional Parallel Port

This alternate function is configured via selecting either the Normal Bidirectional mode configuration or the EPP

mode configuration for the parallel port in the Function Enable 1 Register, Index B0h.

X1OUT [BAUD_OUT] Clock Source

The internal clock source driving out on this pin is configured via register bits of the Function Enable Registers,

Indexes B0h and B1h.

Notes:

The default function of this pin is that no clock is driven out and the pin is tri-stated.

Table 28.

SRAM Interface

SRAM Pin Name

Pin Type

SRAM Interface Pin

Description/Notes

Default Pin

Name/Function

Pin No.

[SRCS0]

SRAM Bank 0 Chip Select. Low Byte

CAS0L

[SRCS1]

SRAM Bank 0 Chip Select. High Byte

CAS0H

[SRCS2]

SRAM Bank 1 Chip Select. Low Byte

CAS1L

[SRCS3]

SRAM Bank 1 Chip Select. High Byte

CAS1H

Table 29.

Bidirectional Parallel Port Pin Description

Bidirectional Pin

Name

Pin Type

Bidirectional Parallel Port Pin

Description/Notes

Default Pin

Name/Function

Pin No.

[PPDCS]

Parallel Port data register address decode

PPDWE

Table 30.

X1OUT Clock Source Pin Description

BAUD_OUT Pin Name

Pin Type

X1OUT [BAUD_OUT] Pin

Description/Notes

Default Pin

Name/Function

Pin No.

[BAUD_OUT]

Serial baud rate clock

X1OUT

200

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