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Global Concepts and Features (Continued)

3.3

TYPICAL CS5535 GEODELINK DEVICE

A typical or “generic” CS5535 GeodeLink Device (GLD) is

illustrated in Figure 3-4 along with internal and external

connections. The GLD consists of the Native Block (NB),

GeodeLink Adapter (GLA), MSRs, and Clock Control Units

(CCU). Each of these is discussed in the following para-

graphs.

Before going into the blocks of the typical device, it should

be noted that the following modules in CS5535 follow this

model very closely:

— AC97 Controller (ACC)

— ATA-5 Controller (ATAC)

— Diverse Device (DD)

Specifically, they all use the GLA.

The NB performs the “useful” work for the device. For

example, in a serial port device, the transmit parallel to

serial shift register is located in this block. The NB con-

nects to the outside world, that is, external devices, via the

I/O cells and pads. The NB contains registers that are

manipulated by software to perform the “work”. These are

operational registers that are typically manipulated by

device drivers. The NBs are covered in detail in the corre-

sponding GeodeLink Device register descriptions.

The GLA sits between the GLIU and the Local bus. The

Local bus is a traditional address/data bus supporting GLA

to NB transactions (slave transactions) and NB to GLA

transactions (master transactions). However, it is a single

transaction bus in that any given slave or master transac-

tion runs to completion before another transaction can

start. This is compatible with the NBs listed above (i.e.,

ACC, ATAC, and DD), which are all single transaction

devices. As suggested by Figure 3-4, the GLA contains no

registers and is strictly speaking, just a bridge.

The MSRs are conceptually separate from the NB and GLA

and generally provide overall GLD configuration and con-

trol. In most designs they are physically separated as

shown. There are six standard MSRs that are detailed in

Section 3.8 "Standard GeodeLink Device MSRs". All GLDs

have these standard MSRs. GLDs may also incorporate

additional MSRs as appropriate.

On the upper right of the figure, the connections between

the GLA and GLIU are illustrated. All of these signals were

covered previously in Section 3.1 "GeodeLink Architecture

Overview".

The Clock Control Units (CCU) are a key component in the

Active Hardware Clock Gating (AHCG) infrastructure. They

provide the mechanism for turning off clocks to sections of

logic that are Not Busy. Furthermore, they take an asyn-

chronous global reset signal and synchronize it to the appli-

cable clock domain.

Figure 3-4. Typical CS5535 GeodeLink Device

MSRs

Native

Block

(NB)

Native

Block

Registers

Adapter

(GLA)

GLIU

MSRs

Reg In

Data In

Reg Out

Data Out

Diag

ASMI

ERR

Other Device

CCU

Local

Bus

Interface

Busy Signals

to GLCP

GL Device

Side-band signals to other Native Blocks

External Device Interface

I/O

Cells &

Pads

GL Clock

Local Bus Clock

Native Clock

Global internal_reset

Connections

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