Intel B940 Datasheet Page 172

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Processor Configuration Registers
172 Datasheet, Volume 2
2.12.18 DMILCAP—DMI Link Capabilities Register
This field indicates DMI specific capabilities.
B/D/F/Type: 0/0/0/DMIBAR
Address Offset: 84–87h
Reset Value: 00012C41h
Access: RO, RW-O
Bit Attr
Reset
Value
Description
31:18 RO 0000h Reserved
17:15 RW-O 010b
L1 Exit Latency (L1SELAT)
This field indicates the length of time this Port requires to complete the
transition from L1 to L0. The value 010b indicates the range of 2 us to less
than 4 us.
000 = Less than 1µs
001 = 1 µs to less than 2 µs
010 = 2 µs to less than 4 µs
011 = 4 µs to less than 8 µs
100 = 8 µs to less than 16 µs
101 = 16 µs to less than 32 µs
110 = 32 µs–64 µs
111 = More than 64 µs
Both bytes of this register that contain a portion of this field must be written
simultaneously in order to prevent an intermediate (and undesired) value
from ever existing.
14:12 RW-O 010b
L0s Exit Latency (L0SELAT)
This field indicates the length of time this Port requires to complete the
transition from L0s to L0.
000 = Less than 64 ns
001 = 64 ns to less than 128 ns
010 = 128 ns to less than 256 ns
011 = 256 ns to less than 512 ns
100 = 512 ns to less than 1 µs
101 = 1 µs to less than 2 µs
110 = 2 µs–4 µs
111 = More than 4 µs
11:10 RO 11b
Active State Link PM Support (ASLPMS)
L0s and L1 entry supported.
9:4 RO 04h
Max Link Width (MLW)
This field indicates the maximum number of lanes supported for this link.
3:0 RO 1h
Max Link Speed (MLS)
Hardwired to indicate 2.5 Gb/s.
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