AM79C930 datasheet(65/161 Pages) AMD

65 / 161 page

P R E L I M I N A R Y

AMD

Am79C930

address needs to be aligned to a 32K boundary in mem-

ory space. This alignment requirement should be in-

cluded in the Resource Data that is programmed into the

Flash device and read by the Plug and Play configura-

tion utility. These conditions

must be satisfied, since the

Am79C930 device’s Bus Interface Unit will only use the

upper 9 bits of the ISA memory address to determine

when an address match has been achieved.

Some of the Am79C930 device’s ISA Memory locations

have predefined uses and, therefore, are not freely

available to the device driver. The following table indi-

cates restricted space within ISA Memory map of the

Am79C930 device:

Am79C930 Device ISA Plug And Play Mode Memory Restricted Space

ISA Address

Size of

Physical Memory And

in Memory

SIR1[5:3]

Restricted Space

Description Of Reserved Use

MBA+0000h –

000

1 Kbytes

SRAM Memory 0 0000h–0 03FFh

MBA+03FFh

This space is reserved for the interrupt vector

table of the embedded 80188 core.

MBA+0400h –

000

32 bytes

SRAM Memory 0 0400h–0 041Fh

MBA+041Fh

This SRAM space is inaccessible to the

80188 embedded core, since the 80188

core maps the 32 TIR registers of the TAI

into this portion of 80188 memory space.

MBA+0420h –

000

32 bytes

SRAM Memory 0 0420h–0 042Fh

MBA+043Fh

This SRAM space is inaccessible to the

80188 embedded core, since the 80188

core maps the MIR registers of the BIU

(PIR, PDLC and PUCT) and

XCE space into

this portion of 80188 memory space.

MBA+0440h –

000

64 bytes

SRAM Memory 0 0440h–0 047Fh

MBA+047Fh

This SRAM space is reserved for future use

and may be decoded for non-SRAM purposes

in the future.

MBA+7C00h –

111

1K–16 bytes

Flash Memory 1 FC00h–1 FFEFh

MBA+7FEFh

These bytes of the Flash memory also map into

the ISA Plug and Play Resource Data space.

Therefore, this space can not be used for

non-Resource Data purposes.

MBA+7FF0h –

111

16 bytes

Flash Memory 1 FFF0h–1 FFFFh

MBA+7FFFh

These 16 bytes of Flash memory space are

reserved because they are the location of

the embedded 80188 core’s instruction

pointer following a Am79C930 device reset

operation. These 16 bytes must contain the

first 80188 instructions.

*MBA = ISA Plug and Play Memory Base Address

AM79C930 Datasheet(PDF) 65 Page - Advanced Micro Devices

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