HCU04: Difference between revisions

Revision as of 20:59, 4 May 2023

The HCU04 is a hex inverter. The first two inverters take SCLK from pin 41 of S-DSP as input:

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-up 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:

U9C, U9D, U9E, and U9F, in region A3 of the jwdonal schematic

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-The '''HCU04''' is a hex inverter.  Its inverters appear in six places on the jwdonal schematic:
+The '''HCU04''' is a hex inverter.  The first two inverters take SCLK from pin 41 of [[S-DSP]] as input:
-* '''U9A''', inputting SCLK and outputting CIC3, in region D2
+* '''U9A''' outputs CIC3 to the [[Cartridge Slot]]
-* '''U9B''', inputting SCLK and outputting CL1, in region D2
+* '''U9B''' outputs CL1 to the [[CIC]]
-* '''U9C''', in series with U9D and R5, in region A3
-* '''U9D''', in parellel with R6 and in series with U9C and C4, in region A3
+[[File:u9a%26b_schematic.png|thumb|U9A and U9B in region D2 of the jwdonal schematic]]
-* '''U9E''', in series with 10 and 11, whatever those are in region A3
-* '''U9F''', in series with 12 and 13, whatever those are in region A3
+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-up 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'''
+[[File:u9cdef schematic.png|thumb|U9C, U9D, U9E, and U9F, in region A3 of the jwdonal schematic]]
 [[Category:SNES Hardware]]
 [[Category:Integrated Circuits]]