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HCU04: Difference between revisions
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The '''HCU04''' is a hex inverter. The first two inverters take SCLK from pin 41 of [[S-DSP]] as input: | The '''HCU04''' is a hex inverter. The first two inverters take [[SCLK]] from pin 41 of [[S-DSP]] as input: | ||
* '''U9A''' outputs CIC3 to the [[Cartridge Slot]] | * '''U9A''' outputs CIC3 to the [[Cartridge Slot]] | ||
Revision as of 16:10, 8 July 2023
The HCU04 is a hex inverter. The first two inverters take SCLK from pin 41 of S-DSP as input:
- U9A outputs CIC3 to the Cartridge Slot
- U9B outputs CL1 to the CIC
U9A and U9B in region D2 of the jwdonal schematic
The next two inverters help generate XIN:
- U9C appears to undo the inversion that U9C did, and sends the output to R5, which eventually becomes XIN after passing by the pull-down R4
- U9D is in parallel with R6, receiving its input from C4 and outputting to U9C
The last two inverters take ground as input and their outputs are not connected:
- U9E
- U9F
