Editing Clocks
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Clock generation is based around one or two "DRCG-lite" (DRCG = Direct Rambus Clock Generator) clockgen ICs by varying manufacturers (Cypress CY2212 or TI CDCR61A). | Clock generation is based around one or two "DRCG-lite" (DRCG = Direct Rambus Clock Generator) clockgen ICs by varying manufacturers (Cypress CY2212 or TI CDCR61A). | ||
All of these boards have an DRCG-lite IC which has an 18.432 Mhz XTAL connected to it's inputs. This DRCG-lite is set for a multiplier of 64/3 and thus creates a 393.216 Mhz clock for [[Emotion Engine|EE]] and [[Rambus DRAM|RDRAM]]. | All of these boards have an DRCG-lite IC which has an 18.432 Mhz XTAL connected to it's inputs. This DRCG-lite is set for a multiplier of 64/3 and thus creates a 393.216 Mhz clock for [[Emotion Engine|EE]] and [[Rambus DRAM|RDRAM]]. | ||
Additionally, all boards that have the original [[Graphics_Synthesizer|GS]] with metal heat spreader, CXD2934GB (GH-001, GH-003, GH-005, GH-007, GH-012, GH-014, GH-016), have a second DRCG-lite IC (also with an 18.432 Mhz XTAL) which is set to a multiplier of 16 to generate a 294.912 Mhz clock which is fed into GS. ''This additional DRCG is not found on their same-chassis-counterparts (GH-004, GH-006, GH-008, GH-010, GH-013) that use the second revision GS (CXD2944GB).'' | |||
''This additional DRCG is not found on | |||
= F, G, H chassis = | = F, G, H chassis = | ||
Based around one "DRCG-lite" and one "GMCG" (=Graphics Media Clock Generator, e.g. Cypress CY24141) clock generator. | Based around one "DRCG-lite" and one "GMCG" (=Graphics Media Clock Generator, e.g. Cypress CY24141) clock generator. The GMCG has a 18.432 Mhz XTAL and generates a 54 Mhz or 53.9 Mhz clock for GS (selection between 54 and 53.9 is done via control line from [[SSBUS controller]], later from the SPU2+SSBUS-Controller combo IC) and also creates a 18.432 Mhz input clock for the DRCG-lite. The main clock output of DRCG-lite is set for a multiplier of 64/3 and thus creates a 393.216 Mhz clock for [[Emotion Engine|EE]] and [[Rambus DRAM|RDRAM]]. Additionally, DRCG lite generates a 9.216 Mhz clock signal for GS from the 18.432 Mhz input via a multiplier of 0.5. | ||
The GMCG has a 18.432 Mhz XTAL and generates a 54 Mhz or 53.9 Mhz clock for GS (selection between 54 and 53.9 is done via control line from [[SSBUS controller]], later from the SPU2+SSBUS-Controller combo IC) and also creates a 18.432 Mhz input clock for the DRCG-lite. | |||
The main clock output of DRCG-lite is set for a multiplier of 64/3 and thus creates a 393.216 Mhz clock for [[Emotion Engine|EE]] and [[Rambus DRAM|RDRAM]]. Additionally, DRCG lite generates a 9.216 Mhz clock signal for GS from the 18.432 Mhz input via a multiplier of 0.5. | |||
= I, J, K, L, M chassis = | = I, J, K, L, M chassis = | ||