CS4210 datasheet(58/102 Pages) NSC

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Revision 1.0

4.4.1

Version Register

The Version register (Table 4-9) contains a 32-bit value

which indicates the version and capabilities of the interface.

The register is expected to be used to indicate the level of

functionality present in the CS4210.

4.4.2

GUIDROM Register

The Global Unique ID ROM register (Table 4-10) is used to

access the GUID ROM. To initialize the GUID ROM read

address, software sets GUIDROM.addrReset to one. Once

software detects that GUIDROM.addrReset is zero, indicat-

ing that the reset has completed, then software may set

GUIDROM.rdStarttoreadabyte. Upon thecompletionof

each read, the CS4210 places the read byte into

GUIDROM.rdData, advances the GUID ROM address by

one byte to set up for the next read, and clears

GUIDROM.rdStart to 0 to indicate to software that the

requested byte has been read.

Table 4-9. BAR0+Offset 00h: Version Register

Bit

Name

Access

Reset

Description

31:25

RSVD

Reserved

GUID_ROM

N/A

Global Unique ID ROM: The third and fourth quadlets of the

Bus_Info_Block are automatically loaded on hardware reset.

23:16

version

01h

Major Version: This field contains the BCD encoded value representing the

major version of the highest numbered 1394 OpenHCI specification with

which the CS4210 is compliant.

15:8

RSVD

Reserved

7:0

revision

Minor Version: This field contains the BCD encoded value representing

the minor version of the highest numbered 1394 OpenHCI specification with

which the CS4210 is compliant.

Table 4-10. BAR0+Offset 04h: GUID ROM Register

Bit

Name

Access

Reset

Description

addrReset

RSU

Address Reset: Software sets this bit to one to reset the GUID ROM

address to zero. When the CS4210 completes the reset, it clears addrReset

to zero. Upon resetting the GUID ROM address, the CS4210 does not auto-

matically fill rdData with the data from byte address 0.

30:26

RSVD

Reserved

rdStart

RSU

Read Start: A read of the currently addressed GUID ROM byte is started

on the transition of this bit from a zero to a one. When the CS4210 com-

pletes the read, it clears rdStart to zero and advances the GUID ROM byte

address by one byte.

RSVD

Reserved

23:16

rdData

Undef

Read Data: The data read from the GUID ROM.

15:0

RSVD

Reserved

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