NEO-253: Difference between revisions

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[[File:Neo-253.jpg|right|thumb|NEO-253 chip found on a [[SLOT4F]] board.]]
{{ChipInfo
|picture=Neo-253.jpg
|pkg=QFP64R
|manu=fujitsu
|date=1992 ?
|gates=
|used_on={{PCB|SLOT4F}}
}}


Quintuple 74HC253 4-to-1 multiplexers with common select lines, making 10 switches in one chip.
Quintuple 74HC253 4-to-1 multiplexers with common select lines, making ten 4-to-1 switches in one chip. Used to switch read-only buses. The inputs are named according to the related slot: A is slot #1, B is slot #2...
Only (?) used on second revision 4-slot MVS systems.


* SLOT4F @ 5E: SDD, PWAIT0, and PWAIT1 mux.
Only (?) used on second revision 4-slot MVS systems. Not to be confused with the more common {{Chipname|NEO-273}}.
* SLOT4F @ 5D: ?
* ...


== Pinout ==
=Pinout=


[[File:Neo-253_pinout.png|512px]]
[[File:Neo-253_pinout.png|512px]]
Line 14: Line 18:
OpenOffice Draw file: [[File:neo-253.odg]]
OpenOffice Draw file: [[File:neo-253.odg]]


Draft:
Select signals come from {{Chipname|NEO-F0}} SLOTA and SLOTB.


54,55: selects
==SLOT4F @ 5E==


Muxes (0,1,2,3,out):
Cartridge [[wait cycle]] configuration and [[Z80]] bus.
* 60,61,62,63,59?
* 49,50,51,52,44?
* 45,46,47,48,43?
* 37,38,39,40,41?
* 33,34,35,36,28?
* 29,30,31,32,27?
* 20,21,22,23,24?
* 12,13,14,15,11?
* 4,5,6,7,?
* 64,1,2,3,?


63:sdd7 slot 4,
*Mux 1: PWAIT0
52
*Mux 2: PWAIT1
48
*Mux 10~3: SDD7~SDD0
40
36
32
23
15:sdd0 slot 4


62:sdd7 slot 3,
Outputs go to CN9.
51
47
39
35
31
22
14:sdd0 slot 3


61:sdd7 slot 2,
==SLOT4F @ 5D==
50
46
38
34
30
21
13


60:sdd7 slot 1,
[[Sprites]] and [[fix layer]] graphics.
49
45
37
33
29
20
12


9/10: ?
*Mux 1: CR30
*Mux 2: CR31
*Mux 10~3: FIXD7~FIXD0


out CN9:59 44 43 41 28 27 24 11
==SLOT4F @ 5C==


7 6 5 4: PWAIT1 4-3-2-1.
Sprite graphics.
3 2 1 64: PWAIT0 4-3-2-1.


8? 16? 17? 18? 19? 42? 53?
*Mux 10~1: CR29~CR20
 
==SLOT4F @ 5B==
 
Sprite graphics.
 
*Mux 10~1: CR19~CR10
 
==SLOT4F @ 5A==
 
Sprite graphics.
 
*Mux 10~1: CR9~CR0


[[Category:Chips]]
[[Category:Chips]]

Latest revision as of 17:07, 18 September 2017

Package QFP64R
Manufacturer
First use 1992 ?
Used on SLOT4F

Quintuple 74HC253 4-to-1 multiplexers with common select lines, making ten 4-to-1 switches in one chip. Used to switch read-only buses. The inputs are named according to the related slot: A is slot #1, B is slot #2...

Only (?) used on second revision 4-slot MVS systems. Not to be confused with the more common NEO-273.

Pinout

OpenOffice Draw file: File:Neo-253.odg

Select signals come from NEO-F0 SLOTA and SLOTB.

SLOT4F @ 5E

Cartridge wait cycle configuration and Z80 bus.

  • Mux 1: PWAIT0
  • Mux 2: PWAIT1
  • Mux 10~3: SDD7~SDD0

Outputs go to CN9.

SLOT4F @ 5D

Sprites and fix layer graphics.

  • Mux 1: CR30
  • Mux 2: CR31
  • Mux 10~3: FIXD7~FIXD0

SLOT4F @ 5C

Sprite graphics.

  • Mux 10~1: CR29~CR20

SLOT4F @ 5B

Sprite graphics.

  • Mux 10~1: CR19~CR10

SLOT4F @ 5A

Sprite graphics.

  • Mux 10~1: CR9~CR0
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