CS4210 datasheet(79/102 Pages) NSC

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4.4.23 Physical Request Filter Registers

If an asynchronous request is allowed from a node, and the

offset is 0000_FFFF_FFFFh, the sourceID of the request is

used as an index into the PhysicalRequestFilter. If the cor-

responding bit in the PhysicalRequestFilter is set to 0, then

the request is forwarded to the Asynchronous Request

Receive DMA context. If, however, the bit is set to 1, then

the request is sent to the physical response unit. (Note that

within the physical range, lock transactions and block trans-

actions with a non-zero extended tcode are always for-

warded to the Asynchronous Request Receive DMA

context (see Section 3.6 "Physical Requests" on page 26.).

This register is set and clear. If bit physReqResourceN is

set, then requests with a sourceID of either {3FFh, #n} or

{busID, #n} (where n is the node number) are accepted. If

the physReqResourceAllBuses bit is set in PhysicalRe-

questFilterHi, physical requests from any device on any

other bus are accepted (bus number other than 3FFh and

busID). Physical requests that are rejected by the Physical-

RequestFilter are sent to the AR Request DMA context if

the AR Request DMA context is enabled. If it is disabled,

then the CS4210 ignores the requests. Reading the Physi-

calRequestFilter registers returns their current state. All

bits in the PhysicalRequestFilter are set to 0 on a 1394 bus

reset.

Table 4-39. BAR0+Offset 110h (Set) and 114h (Clear): PhysicalRequestHi Register

Bit

Name

Access

Reset

Description

physReqRe-

sourceAllBuses

RSCU

Asynchronous Physical Requests Resource All Buses: If setto one,all

asynchronous physical requests received by the CS4210 from non-local

bus nodes are accepted.

30:0

physReqResourceN

RSCU

00h

Asynchronous Physical Requests Resource [62:32]: If set to one for

local bus node number N, then asynchronous physical requests received by

the CS4210 from that node are accepted.

Table 4-40. BAR0+Offset 118h (Set) and 11Ch (Clear): PhysicalRequestLo Register

Bit

Name

Access

Reset

Description

31:0

physReqResourceN

RSCU

00h

Asynchronous Physical Requests Resource [31:0]: If set to one for local

bus node number N, then asynchronous physical requests received by the

CS4210 from that node are accepted.

CS4210 Datasheet(PDF) 79 Page - National Semiconductor (TI)

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