CS4210 Datasheet, PDF(86/102 Page) National Semiconductor (TI)

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CS4210 Datasheet, PDF (86/102 Pages) National Semiconductor (TI) – IEEE 1394 OHCI Controller

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4.4.27 Isochronous Receive

Each isochronous receive context consists of three regis-

ters: ContextControl, CommandPtr, and ContextMatch.

ContextControl is used by software to control the contextâs

behavior, and is used by hardware to indicate current sta-

tus. CommandPtr is used by software to tell the IRDMA

controller where the DMA context program begins. Con-

textMatch is used to start on a specified cycle number and

to filter received packets based on their tag bits and possi-

ble sync bits.

The CS4210 has eight isochronous receive contexts.

These registers are repeated at offsets of 20h times the

context number. Table 4-52 is a map providing the offset

addresses for the ContextControl, CommandPtr, and Con-

textMatch registers.

4.4.27.1 Isoch Receive Context Control Register

The isochronous receive ContextControl register (see

Table 4-53) contains bits that control options, operational

state, and status for the isochronous receive DMA con-

texts. Software can set selected bits by writing ones to the

corresponding bits in the ContextControl Set register. Soft-

ware can clear selected bits by writing ones to the corre-

sponding bits in the ContextControl Clear register. It is not

possible for software to set some bits and clear others in an

atomic operation. A read from either register returns the

same value. It includes several fields which permit software

to filter packets based on various combinations of fields

within the isochronous packet header.

These registers are repeated at offsets of 20h times the

context number (see Table 4-52 for offset address assign-

ment).

Table 4-52. IsochRx Register Address Map

BAR0+Offset Name

400h

404h

408h

40Ch

410h

414h-41Fh

420h

424h

428h

42Ch

430h

434h-43Fh

440h

444h

448h

44Ch

450h

454h-45Fh

460h

464h

468h

46Ch

470h

474h-47Fh

480h

484h

488h

48Ch

490h

494h-49Fh

4A0h

4A4h

4A8h

4ACh

4B0h

4B4h-4BFh

4C0h

4C4h

4C8h

4CCh

4D0h

4D4h-4DFh

4E0h

4E4h

4E8h

4ECh

4F0h

IsochRx0ContextControl Set Register

IsochRx0ContextControl Clear Register

Reserved

IsochRx0CommandPtr Register

IsochRx0ContextMatch Register

Reserved

IsochRx1ContextControl Set Register

IsochRx1ContextControl Clear Register

Reserved

IsochRx1CommandPtr Register

IsochRx1ContextMatch Register

Reserved

IsochRx2ContextControl Set Register

IsochRx2ContextControl Clear Register

Reserved

IsochRx2CommandPtr Register

IsochRx2ContextMatch Register

Reserved

IsochRx3ContextControl Set Register

IsochRx3ContextControl Clear Register

Reserved

IsochRx3CommandPtr Register

IsochRx3ContextMatch Register

Reserved

IsochRx4ContextControl Set Register

IsochRx4ContextControl Clear Register

Reserved

IsochRx4CommandPtr Register

IsochRx4ContextMatch Register

Reserved

IsochRx5ContextControl Set Register

IsochRx5ContextControl Clear Register

Reserved

IsochRx5CommandPtr Register

IsochRx5ContextMatch Register

Reserved

IsochRx6ContextControl Set Register

IsochRx6ContextControl Clear Register

Reserved

IsochRx6CommandPtr Register

IsochRx6ContextMatch Register

Reserved

IsochRx7ContextControl Set Register

IsochRx7ContextControl Clear Register

Reserved

IsochRx7CommandPtr Register

IsochRx7ContextMatch Register

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