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Processor Configuration Registers
216 Datasheet, Volume 2
2.15.32 VTFTCHARBCTL—VC0/VCp VTd Fetch Arbiter Control
This register controls the relative grant count given to each of the DMI VC0, DMI VC1,
and PEG VC0 VT fetch requests.
3:0 RW-L 0h
DMI VC0 Read VT Completion Tracking Queue Resource Threshold
(DMIVC0RDCTQRT)
This field provides a 1-based minimum threshold value used to throttle DMI
VC0 Read VT fetch. When the number of free DMI VT Completion Tracking
Queue entries equals or falls below the value programmed in this field, DMI
VC0 Read VT fetch is throttled until the number of free DMI Completion
Tracking Queue entries rise above this threshold. For example:
0000 = Throttle DMI VC0 Read VT Fetch when there is no entry left.
0001 = Throttle DMI VC0 Read VT Fetch when there is 1 or less entry left.
0010 = Throttle DMI VC0 Read VT Fetch when there is 2 or less entry left.
0011 = Throttle DMI VC0 Read VT Fetch when there is 3 or less entry left.
0100 = Throttle DMI VC0 Read VT Fetch when there is 4 or less entry left.
0101–1111 = Reserved.
B/D/F/Type: 0/0/0/VC0PREMAP
Address Offset: F00–F03h
Reset Value: 00060000h
Access: RW-L, RO
Bit Attr
Reset
Value
Description
B/D/F/Type: 0/0/0/VC0PREMAP
Address Offset: F04–F07h
Reset Value: 0000_FFFFh
Access: RW-L
Bit Attr
Reset
Value
Description
31:16 RW-L 0000h Reserved
15:12 RW-L Fh
PEG1 VC0 VT Fetch Grant Count (PEG1VC0GNTCNT)
The arbiter will continue to grant PEG1 VC0 VT fetch as long as the grant
count value in this field is greater than zero.
11:8 RW-L Fh
PEG VC0 VT Fetch Grant Count (PEGVC0GNTCNT)
The arbiter will continue to grant PEG VC0 VT fetch as long as the grant count
value in this field is greater than zero.
7:4 RW-L Fh
DMI VCp VT Fetch Grant Count (DMIVCPGNTCNT)
The arbiter will continue to grant DMI VCp VT fetch as long as the grant count
value in this field is greater than zero and there is no higher priority VT fetch
request. Arbitration will switch to PEG VC0 VT fetch request if the grant count
corresponding to PEG VC0 VT fetch is greater than zero and the VT fetch
request corresponding to PEG VC0 stream is available.
3:0 RW-L Fh
DMI VC0 VT Fetch Grant Count. (DMIVC0GNTCNT)
The arbiter will continue to grant DMI VC0 VT fetch as long as the grant count
value in this field is greater than zero and there is no higher priority VT fetch
requests. Arbitration will switch to DMI VCp or PEG VC0 VT fetch requests if
the grant count corresponding to those VT fetch is greater than zero and the
VT fetch requests corresponding to those streams are available.
Seitenansicht 215
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