Latest revision as of 18:19, 26 July 2017


Package	SDIP64
Manufacturer
First use	1990 ?
Used on	All systems

The YM2610 is a sound synthesis and playback chip made by Yamaha, found in all versions of the NeoGeo hardware. It was later merged with other chips in NEO-YSA and NEO-YSA2, which are used on some versions of the NeoGeo CD, the CDZ, the MV1C and on ROM-Only boards.

The YM2610 requires a YM3016 external DAC (Digital to Analog Converter) chip for the FM and ADPCM sounds. The only direct analog output is for the SSG mono sounds. Both analog signals are then mixed together before amplification.

The original YM2610 chip gets quite warm during normal operation.

Parts

Sound comes from 3 different generators, each having their own channels:

SSG (Software Sound Generator): 3 channels
FM (Frequency Modulation): 4 channels
ADPCM (Sample playback): 7 channels

Providing 14 channels in total.

Programming

See Z80/YM2610 interface and YM2610 registers.

Pinout

SDD: Z80 data bus
RAD: ADPCM-A multiplexed address/data
RMPX: ADPCM-A address/data select
ROE: APDCM-A data output enable
RA: ADPCM-A address
ANA: SSG analog output
SH1: YM3016 latch 1
SH2: YM3016 latch 2
OP0: YM3016 serial data
PA: ADPCM-B address
POE: ADPCM-B data output enable
PMPX: ADPCM-B address/data select
PAD: ADPCM-B multiplexed address/data
IRQ: Interrupt request output
CS: Chip select
WR: Write
RD: Read
SDA: Z80 address bus
PHI M: Clock input
PHI S: YM3016 clock output

Multiplexed ADPCM bus

Access to the V ROMs are made via partly multiplexed buses. See YM2610 bus timing for more details about the access sequences.

The SDRMPX and SDPMPX signals are used to control latches or the PCM chip in cartridges to demultiplex address and data. When SDROE or SDPOE goes low, SDRAD* and SDPAD* are tristated so that the V ROMs can output data.

SDRA* for ADPCM-A

SDRMPX edge	SDRAD*								SDRA*
SDRMPX edge	0	1	2	3	4	5	6	7	8	9	20	21	22	23
Low to high	0	1	2	3	4	5	6	7	8	9	?	?	?	?
High to low	10	11	12	13	14	15	16	17	18	19	20	21	22	23

SDPA* for ADPCM-B

SDPMPX edge	SDPAD*								SDPA*
SDPMPX edge	0	1	2	3	4	5	6	7	8	9	10	11
Low to high	0	1	2	3	4	5	6	7	8	9	10	11
High to low	12	13	14	15	16	17	18	19	20	21	22	23

24 address bits allow for 16MiB max V ROMs (without bankswitching).

Trivia

A lot of games have several recordings of the same instrument playing different notes, rather than having only one sample and change the ADPCM-B playback frequency to vary its pitch. (Trumpet in Viewpoint, electric guitar in Super Sidekicks). Why ?
Nazca's sound drivers are able to use the SSG channels for music playback. (Maybe all can ?)

Datasheet

Japanese datasheet: [ajworld.net]

Incomplete/translated datasheet: [YM2610.pdf]

@@ Line 1: / Line 1: @@
-[[File:Cd2_ym2610.jpg|thumb|300px|right|YM2610 chip]]
+{{ChipInfo
+|picture=Cd2_ym2610.jpg
+|pkg=SDIP64
+|manu=yamaha
+|date=1990 ?
+|gates=
+|used_on=All systems
+}}
-The YM2610 is a sound synthesis and playback chip made by Yamaha, which is used in all versions of the NeoGeo hardware.
+The YM2610 is a sound synthesis and playback chip made by Yamaha, found in all versions of the NeoGeo hardware.
 It was later merged with other chips in {{Chipname|NEO-YSA}} and {{Chipname|NEO-YSA2}}, which are used on some versions of the NeoGeo CD, the [[CDZ]], the {{PCB|MV1C}} and on [[ROM-Only boards]].
-The YM2610 relies on a {{Chipname|YM3016}} external DAC (Digital to Analog Converter) chip for the [[FM]] and [[ADPCM]] sounds. The only direct analog output is for the [[SSG]] sounds. Both analog outputs are then mixed together before amplification.
+The YM2610 requires a {{Chipname|YM3016}} external DAC (Digital to Analog Converter) chip for the [[FM]] and [[ADPCM]] sounds. The only direct analog output is for the [[SSG]] mono sounds. Both analog signals are then mixed together before amplification.
 The original YM2610 chip gets quite warm during normal operation.
-=Sound generation parts=
+=Parts=
-Sound can come from 3 different generators, each having their own channel(s): SSG, FM synthesis and ADPCM playback.
+Sound comes from 3 different generators, each having their own channels:
-* [[SSG]] (Software Sound Generator)
+* [[SSG]] (Software Sound Generator): 3 channels
-* [[FM]] (Frequency Modulation)
+* [[FM]] (Frequency Modulation): 4 channels
-* [[ADPCM]] (Sample playback)
+* [[ADPCM]] (Sample playback): 7 channels
-=CPU communication=
+Providing 14 channels in total.
-See [[Z80/YM2610 interface]].
+=Programming=
-=Multiplexed PCM bus=
+See [[Z80/YM2610 interface]] and [[YM2610 registers]].
-[[File:Ym2610_pinout.png|right|256px]]
+=Pinout=
-Access to the V ROMs are made via partly multiplexed buses. See [[YM2610 bus timing]] for more details about the access sequences.
+[[File:Ym2610_pinout.png|right|640px]]
-The {{Sig|SDRMPX|SDRMPX}} and {{Sig|SDPMPX|SDPMPX}} signals are used to drive latches or the {{Chipname|PCM}} chip in [[cartridge boards|cartridges]] to demultiplex data. When {{Sig|SDROE|SDROE}} or {{Sig|SDPOE|SDPOE}} goes low, SDRAD* and SDPAD* are tristated so that the V ROMs can output data.
+* {{Sig|SDD|SDD*}}: {{Chipname|Z80}} data bus
+* {{Sig|RAD|RAD*}}: ADPCM-A multiplexed address/data
+* {{Sig|RMPX|RMPX}}: ADPCM-A address/data select
+* {{Sig|ROE|ROE}}: APDCM-A data output enable
+* {{Sig|RA|RA*}}: ADPCM-A address
+* {{Sig|ANA|ANA}}: SSG analog output
+* {{Sig|SH1|SH1}}: {{Chipname|YM3016}} latch 1
+* {{Sig|SH2|SH2}}: YM3016 latch 2
+* {{Sig|OP0|OP0}}: YM3016 serial data
+* {{Sig|PA|PA*}}: ADPCM-B address
+* {{Sig|POE|POE}}: ADPCM-B data output enable
+* {{Sig|PMPX|PMPX}}: ADPCM-B address/data select
+* {{Sig|PAD|PAD*}}: ADPCM-B multiplexed address/data
+* {{Sig|IRQ|IRQ}}: Interrupt request output
+* {{Sig|CS|CS}}: Chip select
+* {{Sig|WR|WR}}: Write
+* {{Sig|RD|RD}}: Read
+* {{Sig|SDA|A*}}: Z80 address bus
+* {{Sig|PHI M|PHI M}}: [[Clock]] input
+* {{Sig|PHI S|PHI S}}: YM3016 clock output
-*SDRA* for ADPCM-A
+<br clear="right"/>
+=Multiplexed ADPCM bus=
+Access to the [[V ROM]]s are made via partly multiplexed buses. See [[YM2610 bus timing]] for more details about the access sequences.
+The {{Sig|SDRMPX|SDRMPX}} and {{Sig|SDPMPX|SDPMPX}} signals are used to control latches or the {{Chipname|PCM}} chip in [[cartridges]] to demultiplex address and data. When {{Sig|SDROE|SDROE}} or {{Sig|SDPOE|SDPOE}} goes low, SDRAD* and SDPAD* are tristated so that the V ROMs can output data.
+* SDRA* for ADPCM-A
 {|class="wikitable"
-!SDRMPX
+!rowspan="2"|SDRMPX edge
 !colspan="8"|SDRAD*
 !colspan="6"|SDRA*
 |-
-|
 !0
 !1
@@ Line 83: / Line 116: @@
 |}
-*SDPA* for ADPCM-B
+* SDPA* for ADPCM-B
 {|class="wikitable"
-!SDPMPX
+!rowspan="2"|SDPMPX edge
 !colspan="8"|SDPAD*
 !colspan="6"|SDPA*
 |-
-|
 !0
 !1
@@ Line 133: / Line 165: @@
 |}
-bits allow for 16MiB max V ROMs (without bankswitching).
+address bits allow for 16MiB max V ROMs (without bankswitching).
-== Trivia ==
+=Trivia=
-*A lot of games have several recordings of the same instrument playing different notes, rather than having only one sample and change the ADPCM-B playback frequency to vary its pitch. (Trumpet in [[Viewpoint]], electric guitar in [[Super Sidekicks]]). Why ?
+* A lot of games have several recordings of the same instrument playing different notes, rather than having only one sample and change the ADPCM-B playback frequency to vary its pitch. (Trumpet in [[Viewpoint]], electric guitar in [[Super Sidekicks]]). Why ?
-*Nazca's [[sound driver]]s are able to use the SSG channels for music playback. (Maybe all can ?)
+* Nazca's [[sound driver]]s are able to use the SSG channels for music playback. (Maybe all can ?)
-== Datasheet ==
+=Datasheet=
 Japanese datasheet: [[http://www.ajworld.net/neogeodev/ym2610am_en.html ajworld.net]]
 Incomplete/translated datasheet: [[http://furrtek.free.fr/noclass/neogeo/YM2610.pdf YM2610.pdf]]
 [[Category:Chips]]
 [[Category:Audio system]]

YM2610: Difference between revisions