ELANSC520 datasheet(122/440 Pages) AMD

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General-Purpose Bus Controller Registers

10-6

Élan™SC520 Microcontroller Register Set Manual

Programming Notes

When this register (GPCSQUAL) is used to qualify a GP bus chip select signal, the external timing relationship

between the qualifier and the chip select is not guaranteed. For example, deassertion of the chip select signal could

precede the qualifier’s deassertion on the external GP bus.

If a single qualifier type (only read or only write) is used to qualify a GP bus chip select signal, the corresponding

chip select is not asserted for accesses of the other type. For example, if the GPCS0_RW bit field is set to 01b to

qualify GP Chip Select 0 with write strobes only, GP Chip Select 0 is not asserted for read accesses.

Before using one of the GPCS7–GPCS1 signals, software must set the corresponding GPCSx_SEL bit in the CSPFS

16 register (see page 20-5).

–8

GPCS4_RW

[1–0]

GPCS4 Qualifier Selection

This field is used to qualify the GP bus chip select 4 with GPIORD, GPIOWR, GPMEMRD or

GPMEMWR.

00 = No qualification.

01 = Qualify the chip select with write strobes (GPIOWR or GPMEMWR)

10 = Qualify the chip select with read strobes (GPIORD or GPMEMRD)

11 = Qualify the chip select with both strobes (GPIORD and GPIOWR, or GPMEMRD and

GPMEMWR)

–6

GPCS3_RW

[1–0]

GPCS3 Qualifier Selection

This field is used to qualify the GP bus chip select 3 with GPIORD, GPIOWR, GPMEMRD or

GPMEMWR.

00 = No qualification.

01 = Qualify the chip select with write strobes (GPIOWR or GPMEMWR)

10 = Qualify the chip select with read strobes (GPIORD or GPMEMRD)

11 = Qualify the chip select with both strobes (GPIORD and GPIOWR, or GPMEMRD and

GPMEMWR)

–4

GPCS2_RW

[1–0]

GPCS2 Qualifier Selection

This field is used to qualify the GP bus chip select 2 with GPIORD, GPIOWR, GPMEMRD or

GPMEMWR.

00 = No qualification.

01 = Qualify the chip select with write strobes (GPIOWR or GPMEMWR)

10 = Qualify the chip select with read strobes (GPIORD or GPMEMRD)

11 = Qualify the chip select with both strobes (GPIORD and GPIOWR, or GPMEMRD and

GPMEMWR)

–2

GPCS1_RW

[1–0]

GPCS1 Qualifier Selection

This field is used to qualify the GP bus chip select 1 with GPIORD, GPIOWR, GPMEMRD or

GPMEMWR.

00 = No qualification.

01 = Qualify the chip select with write strobes (GPIOWR or GPMEMWR)

10 = Qualify the chip select with read strobes (GPIORD or GPMEMRD)

11 = Qualify the chip select with both strobes (GPIORD and GPIOWR, or GPMEMRD and

GPMEMWR)

–0

GPCS0_RW

[1–0]

GPCS0 Qualifier Selection

This field is used to qualify the GP bus chip select 0 with GPIORD, GPIOWR, GPMEMRD or

GPMEMWR.

00 = No qualification.

01 = Qualify the chip select with write strobes (GPIOWR or GPMEMWR)

10 = Qualify the chip select with read strobes (GPIORD or GPMEMRD)

11 = Qualify the chip select with both strobes (GPIORD and GPIOWR, or GPMEMRD and

GPMEMWR)

Bit

Name

Function

ELANSC520 Datasheet(PDF) 122 Page - Advanced Micro Devices

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