07072010, 02:02 PM
Hi,
On acc24e2a with PowerPMAC at what addresses do we find the encoder loss bits?
On acc24e2a with PowerPMAC at what addresses do we find the encoder loss bits?
encoder loss bits

07072010, 02:02 PM
Hi,
On acc24e2a with PowerPMAC at what addresses do we find the encoder loss bits?
07072010, 05:57 PM
(07072010, 02:02 PM)bradp Wrote: Hi, Brad, I think it would be bits 28 and 29 of the Gate3[].Chan[].Status word based upon the memory map included at the end of ACC24E3 manual. Bit 28 is LossStatus which I believe changes and bit 29 latches if an encoder loss is detected. Also bit 30 gives the Count Error.
Sina Sattari
Chief Engineer Delta Tau Data Systems, Inc.
07072010, 11:04 PM
You think it is the same for Acc24e2a as it is for acc24e3 ?
07082010, 05:35 PM
(This post was last modified: 07082010, 05:42 PM by curtwilson.)
On the ACC24E2A, the encoder loss bits are found in the Lattice chip, not the ASIC, as in the ACC24E3.
Here are the base address offsets of the Lattice chips for each ACC24E2x, given by the Gate1 index "i": 4: $D06040 6: $D06140 8: $D0E040 10: $D0E140 12: $D16040 14: $D16140 16: $D1E040 18: $D1E140 The 4 registers in the Lattice are at Base, Base+4, Base+8, and Base+$C, and the encoder loss bit is bit 13 on the 32bit bus. So for the encoderloss bit on the last channel of the first ACC24E2A in a typical system (i=4), you could define: M400>u.io:$d0406C.13.1 The table was halfwrong above. Correction and completion of the table of IC index numbers and ID chip base address offsets: 4: $D06040 5: $D06140 6: $D06050 7: $D06150 8: $D0E040 9: $D0E140 10: $D0E050 11: $D0E150 12: $D16040 13: $D16140 14: $D16050 15: $D16150 16: $D1E040 17: $D1E140 18: $D1E050 19: $D1E150 
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