LTR Max Snoop/Max No-Snoop Latency Register @0x1bc

This register contains the maximum snoop latency and the maximum no-snoop latency that the device is allowed to request in an LTR message it originates.

Table 1. i_LTR_snoop_lat
Bits SW Name Description Reset
9:0 R/W Max Snoop Latency [MSL] When multiplied by the value of the Max Snoop Latency Scale, this field defines the maximum snoop value the device is permitted to request in an LTR message. This field can be written independently for each Physical Function from the local management bus. 0x0
12:10 R/W Max Snoop Latency Scale [MSLS] Specifies the scale value for the Max Snoop Latency. When the setting of this field is non- zero, the actual snoop latency is determined by multiplying the Max Snoop Latency by the following scale factors:
  • 001: 32 ns
  • 010: 1024 ns
  • 011: 32,768 ns
  • 100: 1,047,576 ns
  • 101: 33,554,432 ns
  • 110–111: Reserved
 0x0
15:13 R Reserved [R0] Reserved 0x0
25:16 R/W Max No- Snoop Latency [MNSL] When multiplied by the value of the Max No-Snoop Latency Scale, this field defines the maximum no-snoop value the device is permitted to request in an LTR message. This field can be written independently for each Physical Function from the local management bus. 0x0
28:26 R/W Max No-Snoop Latency Scale [MNSLS] Specifies the scale value for the Max No-Snoop Latency. When the setting of this field is non-zero, the actual snoop latency is determined by multiplying the Max No-Snoop Latency by the following scale factors:
  • 001: 32 ns
  • 010: 1024 ns
  • 011: 32,768 ns
  • 100: 1,047,576 ns
  • 101: 33,554,432 ns
  • 110–111: Reserved
 0x0
31:29 R Reserved [R1] Reserved 0x0