CS5535 datasheet(96/555 Pages) NSC

96 / 555 page

www.national.com

Revision 0.8

4.6

DIVERSE INTEGRATION LOGIC

The Diverse Integration Logic (DIVIL) connects a series of

Local bus devices to the GeodeLink architecture. Figure 4-

10 illustrates how the DIVIL (within the dashed lines) inter-

faces with the other devices of the Diverse Device. The

main blocks of the DIVIL are: Address Decode, Standard

MSRs, Local BARs, and Dataout Mux (DOM).

• Address Decode - Decodes the upper Local bus

address bits to select a target slave. Most of the legacy

devices have fixed addresses or are selectable between

a small number of selectable I/O addresses. However,

many of the functions are relocatable via a Local Base

Address Register (LBAR); established via an MSR.

Address Decode also detects special GLIU cycles, such

as Shutdown, and takes appropriate action.

Figure 4-10. Diverse Logic Block Diagram

GLIU Interface

8254 & Port B

(2) 8259A &

Kybd Emu &

System Mgmt

(2) UART & IR

IRQ Map

Port A

Bus Control

(2) 8237 &

LPC Bus

RTC & CMOS

DMA Map

Control

RAM

GPIO & ICF

MFGP Timers

Local Bus Interface

Pwr Mgmnt

NOR & NAND

Data Out

Data In

Flash Interfaces

and Control

External

I/O

Req/Ack

External

I/O

Address

External

I/O

External

I/O

External

I/O

Slave Addr

& Byte

Enables

RO Packet

Arguments

from MSR

Master Addr

& Byte

Enables

Local Bus

Handshake

Chip

Selects

Address Decode

and

Legacy Decode MSRs

Standard

MSRs

Local BARs,

Compares,

Address

Hits

GeodeLink Adapter

DIVIL

*Data Out Mux not shown.

and

Miscellaneous

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