CS4210 Datasheet, PDF (79/102 Pages) National Semiconductor (TI) – IEEE 1394 OHCI Controller

Register Descriptions (Continued)
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
31
30:0
Name
physReqRe-
sourceAllBuses
Access
RSCU
physReqResourceN RSCU
Reset
0
00h
Description
Asynchronous Physical Requests Resource All Buses: If set to one, all
asynchronous physical requests received by the CS4210 from non-local
bus nodes are accepted.
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.
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