Intel AT80612002931AB Datasheet Page 293

  • Download
  • Add to my manuals
  • Print
  • Page
    / 520
  • Table of contents
  • BOOKMARKS
  • Rated. / 5. Based on customer reviews
Page view 292
Intel
®
Xeon
®
Processor C5500/C3500 Series
February 2010 Datasheet, Volume 1
Order Number: 323103-001 293
PCI Express Non-Transparent Bridge
3.21.1.20 SPAD[0 - 15]: Scratchpad Registers 0 - 15
This set of 16 registers, SPAD0 through SPAD15, are shared to both sides of the NTB.
They are used to pass information across the bridge.
Register:USMEMMISS
Bar:PB01BASE, SB01BASE
Offset:70h
Bit Attr Default Description
15:0 RW 00h
Upstream Memory Miss
This register keeps a running count of misses to any of the 3 upstream
memory windows on the secondary side of the NTB. The counter does not
freeze at max count, it rolls over.
Register:SPADn
Bar:PB01BASE, SB01BASE
Offset:80h, 84h, 88h,8Ch, 90h, 94h, 98h, 9Ch, A0h, A4h, A8h, ACh, B0h, B4h, B8h, BCh
Bit Attr Default Description
31:00 RW 00h
Scratchpad Register n
This set of 16 registers is RW from both sides of the bridge. Synchronization
is provided with a hardware semaphore (SPADSEMA4). Software will use
these registers to pass a protocol, such as a heartbeat, from system to
system across the NTB.
Page view 292
1 2 ... 288 289 290 291 292 293 294 295 296 297 298 ... 519 520

Comments to this Manuals

No comments