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Conference ricks::dechips

Title:	Hudson VLSI
Notice:	For Digital Chip Data - CHIPBZ::PRODUCTION$:[DS_INFO...]
Moderator:	RICKS::PHIPPS

Created:	Wed Feb 12 1986
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	701
Total number of notes:	4658

649.0. "Encore problems" by RHETT::PARKER () Tue Feb 11 1997 17:49

    
    Hi, All. 
    
    Encore sent me the following and I wanted to see if anyone
    has heard of similar problems. They are using Digital UNIX 
    and we have made sure they are using the latest firmware...
    
    TIA, 
    
    Lee                                                                  
    -------------------------------------------------------------
    We are experiencing an anomaly when attempting to access the PLX9060 DMA
    registers of our PCI card after a warm boot on the following DEC CPUs:
    
    DEC 2000, 100 Mhz, DU 3.2d
    DEC 255, DU 4.0A
    PICMG, DU 3.2f
    DEC 231 SBC, DU 4.0
    
    After a cold boot (ie. power cycle) we are able to access the DMA registers
    without error. After a warm boot (reboot) any memory read/write to the DMA
    registers results in only the the upper 24 bits being accessed. We lose
    LSB. The PCI bus analyzer reports byte enables 0001. We believe the problem
    to be on the DEC because the PLX has four bytes of data waiting to be
    accessed, but the CPU only requests 3 bytes.
    
    We have no problem accessing the PCI Local Configuration Registers of
    the PLX which in theory are accessed in the same manner.
    
    The PLX9060 DMA registers are accessed by mapping a PCI address to the PLX
    local bus. In our case, we use the Expansion ROM PCI address provided by the
    DEC PAL code. We then access the registers by performing a memory read/write
    operation to the assigned PCI address. We suspect this may be where the
    error is, since we are not following the PCI spec for Expansion ROM usage.
    However, this is the PLX recommended method of accessing the DMA
    registers.

T.R	Title	User	Date	Lines
649.1	What address?	WONDER::WILLARD	`Tue Feb 11 1997 19:18`	4
	Sounds like you have a logic analyzer on the PCI. What is the address? In particular, are the two LSBs 0s? Cheers, Bob
649.2	MOre Info...	RHETT::PARKER	`Thu Feb 13 1997 14:37`	146
	Thanks for the reply Bob! I've gotten more information from the customer/partner at Encore. If anyone wants/needs to entire output from the PCI anaylzer, just let me know. ;-) Lee ---------------------------------------------------------------------- >From a sw view we get a 3 in the LSB. On the analyzer we get for example, 012345.. The .. is indicating that the CPU is only requesting 3 bytes. We verified this by looking at the byte enables. This happens on any address from the base of expansion ROM to the end of expansion ROM. We start at offset 0x100. Attached are 2 snaps from the analyzer and my original description of the problem. Both snaps run the exact same s/w. The first is after a cold boot, the second after a warm boot. In a seperate e-mail I will send a snap of the total capture from a cold start and a total capture from a warm start. 2/13/97 10:20:57 AM C:\BUSVIEW\GOODDMA.TRC Sample TimeRel TimeRel Command BE# Address Data Status Err Acess of Local Configuration registers -1405 9.51us 9.51us MemRd ....0000 0020081C FFC00000 OK -- -1404 9.51us 9.51us MemRd ....0000 00200820 00400000 OK -- -1403 9.51us 9.51us MemRd ....0000 00200828 428000E1 OK -- -1402 13.48us 13.48us MemWri ....0000 00200864 00000000 OK -- -1401 23.77us 23.77us MemWri ....0000 00200860 00000000 OK -- -1400 8.58us 8.58us MemWri ....0000 00200868 00030101 OK -- -1399 7.87us 7.87us MemWri ....0000 0020086C 0001767E OK -- -1398 9.39us 9.39us MemWri ....0000 00200860 00000002 OK -- -1397 9.82us 9.82us MemRd ....0000 00200860 00000000 OK -- -1396 11.37us 11.37us MemRd ....0000 00200840 00001801 OK -- -1395 10.19us 10.19us MemRd ....0000 00200844 00000702 OK -- -1394 9.82us 9.82us MemRd ....0000 00200848 00000002 OK -- -1393 11.06us 11.06us MemRd ....0000 00200860 00000000 OK -- -1392 9.76us 9.76us MemRd ....0000 00200864 00000001 OK -- -1391 9.70us 9.70us MemRd ....0000 00200868 00030101 OK -- -1390 9.76us 9.76us MemRd ....0000 0020086C 9801767E OK -- -1389 19.62us 19.62us MemWri ....0000 00200840 00000000 OK -- -1388 8.33us 8.33us MemWri ....0000 00200860 00000001 OK -- -1387 8.02us 8.02us MemRd ....0000 00200860 00000000 OK -- -1386 1.556s 1.556s MemWri ....0000 00200860 00000002 OK -- -1385 26.07us 26.07us MemRd ....0000 00200860 00000000 OK -- -1384 12.61us 12.61us MemRd ....0000 00200844 00000702 OK -- Start of DMA register access (IE EXP ROM) -1383 16.16s 16.16s MemWri ....0000 00200100 00001FFF OK -- -1382 19.62us 19.62us MemRd ....0000 00200100 00001FFF OK -- -1381 13.67us 13.67us MemWri ....0000 00200100 00000000 OK -- -1380 7.90us 7.90us MemRd ....0000 00200100 00000000 OK -- -1379 11.37us 11.37us MemWri ....0000 00200100 00000AAA OK -- -1378 7.90us 7.90us MemRd ....0000 00200100 00000AAA OK -- -1377 11.00us 11.00us MemWri ....0000 00200100 00001555 OK -- -1376 7.87us 7.87us MemRd ....0000 00200100 00001555 OK -- -1375 12.74us 12.74us MemWri ....0000 00200100 00000001 OK -- -1374 7.75us 7.75us MemRd ....0000 00200100 00000001 OK -- -1373 30.53us 30.53us MemWri ....0000 00200100 00000002 OK -- -1372 7.87us 7.87us MemRd ....0000 00200100 00000002 OK -- -1371 10.57us 10.57us MemWri ....0000 00200100 00000004 OK -- -1370 7.75us 7.75us MemRd ....0000 00200100 00000004 OK -- -1369 10.57us 10.57us MemWri ....0000 00200100 00000008 OK -- -1368 7.78us 7.78us MemRd ....0000 00200100 00000008 OK -- -1367 10.57us 10.57us MemWri ....0000 00200100 00000010 OK -- -1366 7.78us 7.78us MemRd ....0000 00200100 00000010 OK -- -1365 10.57us 10.57us MemWri ....0000 00200100 00000020 OK -- -1364 7.78us 7.78us MemRd ....0000 00200100 00000020 OK -- -1363 10.57us 10.57us MemWri ....0000 00200100 00000040 OK -- -1362 7.78us 7.78us MemRd ....0000 00200100 00000040 OK -- -1361 10.57us 10.57us MemWri ....0000 00200100 00000080 OK -- -1360 7.78us 7.78us MemRd ....0000 00200100 00000080 OK -- -1359 10.57us 10.57us MemWri ....0000 00200100 00000100 OK -- -1358 7.78us 7.78us MemRd ....0000 00200100 00000100 OK -- -1357 10.57us 10.57us MemWri ....0000 00200100 00000200 OK -- -1356 7.78us 7.78us MemRd ....0000 00200100 00000200 OK -- -1355 10.57us 10.57us MemWri ....0000 00200100 00000400 OK -- -1354 7.78us 7.78us MemRd ....0000 00200100 00000400 OK -- -1353 10.57us 10.57us MemWri ....0000 00200100 00000800 OK -- -1352 7.78us 7.78us MemRd ....0000 00200100 00000800 OK -- -1351 10.57us 10.57us MemWri ....0000 00200100 00001000 OK -- . . . -5 8.15us 8.15us MemWri ....0000 0020011C 00000000 OK -- -4 8.15us 8.15us MemWri ....0000 00200120 00000000 OK -- -3 8.15us 8.15us MemWri ....0000 00200124 00000000 OK -- -2 8.15us 8.15us MemWri ....0000 00200128 00001010 OK -- -1 8.15us 8.15us MemWri ....0000 0020012C 00000000 OK -- HALT 8.15us 8.15us MemWri ....0000 00200130 00000000 OK -- 2/13/97 10:20:08 AM C:\BUSVIEW\BADDMA.TRC Sample TimeRel TimeRel Command BE# Address Data Status Err Normal access to Local Config registers. -29 13.17us 13.17us MemRd ....0000 00200800 FF800008 OK -- -28 9.57us 9.57us MemRd ....0000 00200804 00000001 OK -- -27 10.57us 10.57us MemRd ....0000 00200810 FFFFF800 OK -- -26 9.14us 9.14us MemRd ....0000 00200814 80000000 OK -- -25 9.45us 9.45us MemRd ....0000 00200818 414302C3 OK -- -24 9.45us 9.45us MemRd ....0000 0020081C FFC00000 OK -- -23 9.45us 9.45us MemRd ....0000 00200820 00400000 OK -- -22 9.45us 9.45us MemRd ....0000 00200828 428000E1 OK -- -21 12.55us 12.55us MemWri ....0000 00200864 00000000 OK -- -20 8.27us 8.27us MemWri ....0000 00200860 00000000 OK -- -19 8.21us 8.21us MemWri ....0000 00200868 00030101 OK -- -18 7.84us 7.84us MemWri ....0000 0020086C 0001767E OK -- -17 9.33us 9.33us MemWri ....0000 00200860 00000002 OK -- -16 9.76us 9.76us MemRd ....0000 00200860 00000000 OK -- -15 11.25us 11.25us MemRd ....0000 00200840 00001801 OK -- -14 10.19us 10.19us MemRd ....0000 00200844 00000702 OK -- -13 10.01us 10.01us MemRd ....0000 00200848 00000002 OK -- -12 11.12us 11.12us MemRd ....0000 00200860 00000000 OK -- -11 9.70us 9.70us MemRd ....0000 00200864 00000001 OK -- -10 9.64us 9.64us MemRd ....0000 00200868 00030101 OK -- -9 9.76us 9.76us MemRd ....0000 0020086C 9801767E OK -- -8 19.74us 19.74us MemWri ....0000 00200840 00000000 OK -- -7 8.33us 8.33us MemWri ....0000 00200860 00000001 OK -- -6 8.02us 8.02us MemRd ....0000 00200860 00000000 OK -- -5 1.702s 1.702s MemWri ....0000 00200860 00000002 OK -- -4 26.44us 26.44us MemRd ....0000 00200860 00000000 OK -- -3 12.43us 12.43us MemRd ....0000 00200844 00000702 OK -- DMA Register access failure (IE EXP ROM) -2 13.82s 13.82s MemWri ....0001 00200100 00001F.. OK -- -1 20.86us 20.86us MemRd ....0001 00200100 00001F.. OK -- HALT 4.5949ms 4.5949ms MemWri ....0001 00200100 000000.. OK --