CS4210 datasheet(86/102 Pages) NSC

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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 context’s

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

IsochRx0ContextControl Set Register

404h

IsochRx0ContextControl Clear Register

408h

Reserved

40Ch

IsochRx0CommandPtr Register

410h

IsochRx0ContextMatch Register

414h-41Fh

Reserved

420h

IsochRx1ContextControl Set Register

424h

IsochRx1ContextControl Clear Register

428h

Reserved

42Ch

IsochRx1CommandPtr Register

430h

IsochRx1ContextMatch Register

434h-43Fh

Reserved

440h

IsochRx2ContextControl Set Register

444h

IsochRx2ContextControl Clear Register

448h

Reserved

44Ch

IsochRx2CommandPtr Register

450h

IsochRx2ContextMatch Register

454h-45Fh

Reserved

460h

IsochRx3ContextControl Set Register

464h

IsochRx3ContextControl Clear Register

468h

Reserved

46Ch

IsochRx3CommandPtr Register

470h

IsochRx3ContextMatch Register

474h-47Fh

Reserved

480h

IsochRx4ContextControl Set Register

484h

IsochRx4ContextControl Clear Register

488h

Reserved

48Ch

IsochRx4CommandPtr Register

490h

IsochRx4ContextMatch Register

494h-49Fh

Reserved

4A0h

IsochRx5ContextControl Set Register

4A4h

IsochRx5ContextControl Clear Register

4A8h

Reserved

4ACh

IsochRx5CommandPtr Register

4B0h

IsochRx5ContextMatch Register

4B4h-4BFh

Reserved

4C0h

IsochRx6ContextControl Set Register

4C4h

IsochRx6ContextControl Clear Register

4C8h

Reserved

4CCh

IsochRx6CommandPtr Register

4D0h

IsochRx6ContextMatch Register

4D4h-4DFh

Reserved

4E0h

IsochRx7ContextControl Set Register

4E4h

IsochRx7ContextControl Clear Register

4E8h

Reserved

4ECh

IsochRx7CommandPtr Register

4F0h

IsochRx7ContextMatch Register

CS4210 Datasheet(PDF) 86 Page - National Semiconductor (TI)

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