Editing amd/am2900

{{amd title|Am2900}}
{{ic family
| title             = AMD Am2900
| image             = Ic-photo-AMD--AM2903ADCB-(AM2900).png
| caption           = Am2903 Enhanced ALU
| developer         = AMD
| manufacturer      = AMD
| type              = microprocessors
| production start  = 1975
| production end    = 1998
| arch              = 4-bit bit-slice
| word              = 4 bit
| proc              = <!-- process, e.g. "8 μm"                                      -->
| tech              = Bipolar
| clock min         = 1 MHz
| clock max         = 31 MHz
| package           = DIP40
| package 2         = FP42
}}
The '''AMD Am2900''' is a [[microprocessor family|family]] of [[4-bit architecture|4-bit]] [[bit-slice microprocessor|bit-slice]] chips designed by [[Advanced Micro Devices]] and introduced to the market in August [[1975]]. Each component represents an individual unit in a microprocessor. Designed to be flexible and expandable, those chips were capable of emulating a large number of existing systems. Made in bipolar technology allowed for higher speeds (1-20Mhz, later up to 32). Its flexibility, higher speed, unusually large amount of 2nd sources, and good marketing allowed AMD to dominate the [[bit-slice microprocessor|bit-slice]] market. The Am2900 family became very popular then and was used as the de facto baseline for bit-slice design.

== Design ==
The family includes two {{arch|4}} [[ALU]]s - ''2901'' and a ''2903''. The {{amd|AM2901}}/{{amd|AM2901A|A}} was the original chip designed, supporting 8 different basic operations. The {{amd|AM2903}}/{{amd|AM2903A|A}} was an enhanced version designed a bit later which included 7 additional operations. The slices can be stacked to produce 8, 12, or 16 data paths and memory addresses for use in larger programs.

{{expand section}}
== 2nd sources ==
The ''Am2900'' had a large number of 2nd sources:

{| class="wikitable" style="border-collapse:collapse;"
! 75 || 76 || 77 || 78 || 79 || 80 || 81 || 82 || 83 || 84 || 85 || 86 || 87 || 88 || 89 || 90 || 91 || 92 || 93 || 94 || 95 || 96
|-
| colspan="9" style="background: #E8E8E8;" | [[Motorola]]
|-
| colspan="22" style="background: #E8E8E8;" | [[Thomson-CSF]]
|-
| colspan="7" style="background: #E8E8E8;" | [[Raytheon]]
|-
| colspan="2" style="border: none;" | || colspan="15" style="background: #E8E8E8;" | [[National]]
|-
| colspan="3" style="border: none;" | || colspan="6" style="background: #E8E8E8;" | [[Fairchild]]
|-
| colspan="3" style="border: none;" | || colspan="3" style="background: #E8E8E8;" | [[Signetics]]
|-
| colspan="3" style="border: none;" | || colspan="6" style="background: #E8E8E8;" | [[NEC]]
|-
| colspan="5" style="border: none;" | || colspan="2" style="background: #E8E8E8;" | [[OKI]]
|-
| colspan="10" style="border: none;" | || colspan="7" style="background: #E8E8E8;" | [[Cypress]]
|-
| colspan="11" style="border: none;" | || colspan="3" style="background: #E8E8E8;" | [[Vitesse]]
|-
| colspan="11" style="border: none;" | || colspan="11" style="background: #E8E8E8;" | [[Elektronika]]
|}

== Members ==
{| class="wikitable"
! colspan="3" | Family Members
|-
! Part !! Description !! Pin count
|-
| {{\|AM2901}}<br />{{\|AM2901A}}<br />{{\|AM2901B}} || [[4-bit architecture|4-bit]] [[ALU]] || 40, 42
|-
| {{\|AM2901C}} || [[4-bit architecture|4-bit]] [[ALU]], internal [[ECL]] circuitry, ultrafast plug-in replacement for the {{amd|AM2901B|2901B}} || 40, 42, 44 
|-
| {{\|AM2902}} || [[Carry-lookahead generator]] || 16, 20
|-
| {{\|AM2903}}<br />{{\|AM2903A}} || [[4-bit architecture|4-bit]] [[ALU]], enhanced version of the {{amd|AM2901|2901}} || 48, 52
|-
| {{\|AM29203}} || [[4-bit architecture|4-bit]] [[ALU]], enhanced version of the {{amd|AM2903|2903}} supporting BCD arithmetics || 48, 52
|-
| {{\|AM2904}} || Status and shift control unit || 40, 42, 44
|-
| {{\|AM2905}} || Quad 2-input bus transceiver || 24
|-
| {{\|AM2906}} || Quad 2-input bus transceiver with parity || 24
|-
| {{\|AM2907}}<br />{{\|AM2908}} || Quad bus transceiver with interface logic || 20
|-
| {{\|AM2909}}<br />{{\|AM2909A}} || 4-bit slice cascadable microprogram address sequencer || 28
|-
| {{\|AM2910}}<br />{{\|AM2910A}} || 12-bit microprogram address sequencer and controller || 40, 42, 44
|-
| {{\|AM2911}}<br />{{\|AM2911A}} || 4-bit slice cascadable microprogram address sequencer || 20
|-
| {{\|AM2912}} || Quad bus transceiver || 16
|-
| {{\|AM2913}} || Priority [[interrupt]] expander || 20
|-
| {{\|AM2914}} || Vectored priority [[interrupt]] controller || 40, 42, 44
|-
| {{\|AM2915}}<br />{{\|AM2915A}}<br />{{\|AM2916}}<br />{{\|AM2916A}} || Quad 3-state registered bus transceiver with 2-port input || 24
|-
| {{\|AM2917}}<br />{{\|AM2917A}} || Quad 3-state registered bus transceiver || 20
|-
| {{\|AM2918}}<br />{{\|AM29LS18}} || Quad D register with standard and 3-state outputs || 16, 20
|-
| {{\|AM2919}} || Quad D register with dual 3-state outputs || 20
|-
| {{\|AM2920}} || Octal D [[flip-flop]] register with 3-state control || 22, 24, 28
|-
| {{\|AM2921}} || 1-to-8 [[decoder]] with 3-state outputs || 20
|-
| {{\|AM2922}} || 8-input multiplexer ([[MUX]]) with control register || 20
|-
| {{\|AM2923}} || 8-input multiplexer ([[MUX]]) || 16, 20
|-
| {{\|AM2924}} || 3-to-8 [[decoder]]/[[demultiplexer]] || 16, 20
|-
| {{\|AM2925}} || [[clock generator|Clock generator]] and [[microcycle]] length controller || 24, 28
|-
| {{\|AM2926}}<br />{{\|AM2929}} || 3-state quad bus driver and receiver || 16
|-
| {{\|AM2927}}<br />{{\|AM2928}} || Quad 3-state bus transceiver || 20, 28
|-
| {{\|AM2930}} || Program control unit, 4-bit slice address controller for memories || 28
|-
| {{\|AM2932}} || Program control unit with push/pop stack, 4-bit slice address controller for memories || 20, 28
|-
| {{\|AM2940}} || [[direct memory access|DMA]] address generator, cascadable 8-bit slice || 28
|-
| {{\|AM2942}} || Programmable [[timer]]/[[counter]] or [[direct memory access|DMA]] address generator || 22, 28
|-
| {{\|AM2946}}<br />{{\|AM2947}}<br />{{\|AM2948}}<br />{{\|AM2949}} || Octal 3-state bidirectional bus transceiver || 20
|-
| {{\|AM2950}}<br />{{\|AM2951}} || 8-bit bidirectional I/O port with handshake, back-to-back registers || 28
|-
| {{\|AM2952}}<br />{{\|AM2953}} || 8-bit bidirectional I/O port, back-to-back registers || 24
|-
| {{\|AM2954}}<br />{{\|AM2955}} || Octal registers || 20
|-
| {{\|AM2956}}<br />{{\|AM2957}} || Octal latches || 20
|-
| {{\|AM2958}}<br />{{\|AM2959}} || Octal buffer || 20
|-
| {{\|AM2960}}<br />{{\|AM2960A}} || Cascadable 16-bit error detection and correction unit || 48, 52, 68
|-
| {{\|AM2961}}<br />{{\|AM2962}} || 4-bit error correction multiple bus buffer || 24
|-
| {{\|AM2964}}<br />{{\|AM2964B}} || Dynamic memory controller supporting 16K and 64K [[mosfet|MOS]] dynamic [[random access memory|RAM]] || 40, 44
|-
| {{\|AM2965}}<br />{{\|AM2966}} || Octal dynamic memory driver || 20
|-
| {{\|AM2968A}} || Dynamic memory controller supporting 16K, 64K and 256K [[mosfet|MOS]] dynamic [[random access memory|RAM]] || 48, 68
|-
| {{\|AM2969}} || Memory timing controller with [[error detection and correction|EDC]] timing control, supporting 64K, 256K, 1M and 4M [[mosfet|MOS]]  dynamic [[random access memory|RAM]] || 48, 68
|-
| {{\|AM2970}} || Memory timing controller supporting 64K, 256K, 1M and 4M [[mosfet|MOS]]  dynamic [[random access memory|RAM]] || 24
|-
| {{\|AM2971}}<br />{{\|AM2971A}} || Programmable event generator of 12 simultaneous timing sequences || 24, 44
|-
| {{\|AM29700}}<br />{{\|AM29701}} || 16-word by 4-bit Schottky [[random access memory|RAM]] || 16
|-
| {{\|AM29702}}<br />{{\|AM29703}} || 16-word by 4-bit Schottky [[random access memory|RAM]] || 16
|-
| {{\|AM29704}}<br />{{\|AM29705}}<br />{{\|AM29705A}} || 16-word by 4-bit, 2-port [[random access memory|RAM]] || 28
|-
| {{\|AM29707}} || 16-word by 4-bit, 2-port [[random access memory|RAM]] for use with {{\|AM29203}} || 28
|-
| {{\|AM29720}}<br />{{\|AM29721}} || 256-word by 1-bit low-power Schottky [[random access memory|RAM]] || 16
|-
| {{\|AM29750A}}<br />{{\|AM29751A}} || 32-word by 8-bit bipolar [[programmable read-only memory|PROM]] || 16
|-
| {{\|AM29760A}}<br />{{\|AM29761A}} || 256-word by 4-bit bipolar [[programmable read-only memory|PROM]] || 16
|-
| {{\|AM29770}}<br />{{\|AM29771}} || 512-word by 4-bit bipolar [[programmable read-only memory|PROM]] || 16
|-
| {{\|AM29774}}<br />{{\|AM29775}} || 512-word by 8-bit bipolar [[programmable read-only memory|PROM]] with register || 22
|-
| {{\|AM29803A}} || 16-way branch control unit for use with {{\|AM2909A}} || 16
|-
| {{\|AM29811A}} || Next address control unit for use with {{\|AM2911A}} || 16
|}

== Documents ==

=== Databooks ===
* [[:File:The Am2900 Family Data Book With Related Support Circuits (1979).pdf|The Am2900 Family Data Book With Related Support Circuits (1979)]]


{{DEFAULTSORT:Am2900}}
[[Category:AMD microprocessors]]
[[Category:4-bit microprocessors]]
[[Category:1975 microprocessors]]
[[Category:microprocessor families]]
[[Category:AMD Am2900 family]]
designer	AMD +
full page name	amd/am2900 +
instance of	microprocessor family +
main designer	AMD +
manufacturer	AMD +
name	AMD Am2900 +
package	DIP40 + and FP42 +
technology	Bipolar +
word size	4 bit (0.5 octets, 1 nibbles) +