Vax 613 0S Manuel d'instructions Page 62

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3.3.4 TURBOchannel Error Register (TCEREG)—1.C200.0018
The TURBOchannel ASIC error register saves useful state during error
conditions. It locks on the first error (loads data) and unlocks on any write.
Write operations to this register or the FADR register unlock both.
Note
Writing to this register unlocks both TCEREG and FADR. While unlocked,
the contents of this register are UNPREDICTABLE.
The registers format and contents are:
07 06 04 03 000815 13 1229 1628 27 24 23 2231 30
MR−0072−93RAGS
D W MASK0 SYNDROME OFFSET L PBS SLOT ID00
Bits Access Init. Description
3:0 R/WU UNP Slot ID of failing transaction
4 R/WU UNP Scatter/gather mode for slot
5 R/WU UNP Block mode for slot
6 R/WU UNP Parity enable for slot
7 R/WU 0 Lock bit, indicates the error registers are locked
12:8 R/WU UNP Failing DMA address offset (from FADR)
15:13 UNP Reserved
22:16 R/WU UNP ECC syndrome saved during ECC errors
23 UNP Reserved
27:24 R/WU UNP Byte mask for I/O write operations
29:28 UNP Reserved
30 R/WU UNP Read vs Write indication; Write(1) / Read(0)
31 R/WU UNP DMA vs I/O indication; DMA(1) / IO(0)
3–14 TURBOchannel I/O Registers
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