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[[File:Clkdistribution.png|frame]] | [[File:Clkdistribution.png|frame]] | ||
The main system clock is 24MHz. It is | == In cartridge systems == | ||
The main system clock is 24MHz. It is generated and divided by 2, 4 and 24 by [[NEO-D0]] to form the 12MHz clock for [[NEO-ZMC2]], the inverted 6MHz one for the [[video DAC]] and also the 1MHz one for [[NEO-B1]] (?). | |||
[[LSPC2-A2]] divides the 24MHz clock to 8MHz for the [[YM2610]] and 4MHz for the [[Z80]]. | [[LSPC2-A2]] divides the 24MHz clock to 8MHz for the [[YM2610]] and 4MHz for the [[Z80]]. | ||
The cartridge connector provides access to the 24, 12, 8MHz and 4MHz inverted clock signals. | |||
A second quartz is used on NeoGeo systems for generating the color burst frequency for the [[video encoder]]s. | A second quartz is used on NeoGeo systems for generating the color burst frequency for the [[video encoder]]s. | ||
[[File:clock.png]] | [[File:clock.png]] | ||
"B" signals are phase-inverted. | "B" signals are phase-inverted. | ||
== In CD systems == | |||
[[File:Cd2_quartz.jpg|thumb|System clock and color burst generation circuit on a CDM3-2 board.]] | |||
[[NEO-GRC]] ? | |||
[[Category:Base system]] | [[Category:Base system]] | ||
Revision as of 17:42, 20 September 2011
In cartridge systems
The main system clock is 24MHz. It is generated and divided by 2, 4 and 24 by NEO-D0 to form the 12MHz clock for NEO-ZMC2, the inverted 6MHz one for the video DAC and also the 1MHz one for NEO-B1 (?).
LSPC2-A2 divides the 24MHz clock to 8MHz for the YM2610 and 4MHz for the Z80.
The cartridge connector provides access to the 24, 12, 8MHz and 4MHz inverted clock signals.
A second quartz is used on NeoGeo systems for generating the color burst frequency for the video encoders.
"B" signals are phase-inverted.
In CD systems
NEO-GRC ?