Create New Item
Item Type
File
Folder
Item Name
Search file in folder and subfolders...
Are you sure want to rename?
File Manager
/
chart-export-handler
/
Projet
/
Example
/
HC12
/
BC32
:
CME12B.PLD
Advanced Search
Upload
New Item
Settings
Back
Back Up
Advanced Editor
Save
Name CME12B; Partno CME12B; Revision 01; Date 04/8/98; Designer Forrester; Company Axiom Manufacturing; Assembly CME12B decode; Location U8; Device g16v8a ; /************************************************************************/ /* This device generates the chip select signals for the memory map. */ /************************************************************************/ /** Inputs **/ pin 1 = E ; /* E clock input */ pin 2 = G1 ; /* Address gate input */ pin 3 = G2 ; /* Address gate input */ pin 4 = A9 ; /* A9 input */ pin 5 = A15 ; /* A15 input */ pin 6 = A0 ; /* A0 input */ pin 7 = !RW ; /* memory write strobe */ pin 8 = !LSB ; /* Low Byte strobe */ pin 9 = !DBE ; /* Data Bus Enable */ pin 11 = !MEM ; /* External memory enable input */ pin 12 = !ROM ; /* External rom enable */ /** Outputs **/ pin 13 = !P_SEL ; /* Peripheral area select */ pin 14 = !M_CS ; /* Rom memory select */ pin 15 = !R_1 ; /* Ram cs 1 odd */ pin 16 = !R_0 ; /* Ram cs 0 even */ pin 17 = !OE ; /* Memory output enable */ pin 18 = !WE ; /* Memory Write enable */ pin 19 = AS ; /* Address latch */ /** Logic Equations **/ B0 = (!A0 & E) ; /* Byte 0 access equation */ /* B1 = LSB ; /* Byte 1 access equation */ B1 = (LSB) # (A15 & !RW & E) ; /* Byte 1 access equation */ OE = !RW & E & MEM ; /* Output enable */ WE = RW & E & MEM ; /* Write enable */ P_SEL = G1 & G2 & !A15 & A9 & E & MEM ; /* $200 - $3FF */ AS = !E & MEM ; /* Address strobe */ M_CS = A15 & MEM & ROM & E ; /* $8000-$Ffff */ R_0 = B0 & MEM & !M_CS & !P_SEL ; /* $400-$7FFF or $400-$FFFF even */ R_1 = B1 & MEM & !M_CS & !P_SEL ; /* $400-$7FFF or $400-$ffff odd */