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fix an error in the new documentation comment, no whatsnew

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Jonathan Gevaryahu 2010-07-06 07:15:36 +00:00
parent 116e5a390d
commit 0646440c51
1 changed files with 8 additions and 5 deletions
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13
src/emu/sound/tms5220.c
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@ -106,14 +106,17 @@ Patent notes (important timing info for interpolation):
6 = >>1 (/2) (NOTE: this value may actually be >>2 (/4), the patent has an error on it and is unclear) 6 = >>1 (/2) (NOTE: this value may actually be >>2 (/4), the patent has an error on it and is unclear)
7 = >>1 (/2) 7 = >>1 (/2)
0 = >>0 (/1, forcing current values to equal target values) 0 = >>0 (/1, forcing current values to equal target values)
Every IP full count, a new frame is parsed, but ONLY on the 0->* transition. Every IP full count, a new frame is parsed, but ONLY on the 0->*
NOTE: on TMS5220C ONLY, the rate setting is implied by the datasheet to transition.
determines what IP is reloaded to upon overflow; depending on the rate NOTE: on TMS5220C ONLY, the datasheet IMPLIES the following:
setting it will be 0, 2, 4 or 6; other chips always reload to 0. Upon new frame parse (end of IP=0), the IP is forced to a value depending
on the TMS5220C-specific rate setting. For rate settings 0, 1, 2, 3, it
will be forced to 1, 3, 5 or 7 respectively. On non-TMS5220 chips, it
counts as expected (IP=1 follows IP=0) always.
This means, the tms5220c with rates set to n counts IP as follows: This means, the tms5220c with rates set to n counts IP as follows:
(new frame parse is indicated with a #) (new frame parse is indicated with a #)
Rate IP Count Rate IP Count
00 7 0#1 2 3 4 5 6 7 0#1 2 3 4 5 6 7 00 7 0#1 2 3 4 5 6 7 0#1 2 3 4 5 6 7 <- non-tms5220c chips always follow this pattern
01 7 0#3 4 5 6 7 0#3 4 5 6 7 0#3 4 5 01 7 0#3 4 5 6 7 0#3 4 5 6 7 0#3 4 5
10 7 0#5 6 7 0#5 6 7 0#5 6 7 0#5 6 7 10 7 0#5 6 7 0#5 6 7 0#5 6 7 0#5 6 7
11 7 0#7 0#7 0#7 0#7 0#7 0#7 0#7 0#7 11 7 0#7 0#7 0#7 0#7 0#7 0#7 0#7 0#7