156 Part 2 ½ Regions of Computer Space Section 1½ Microprogram-Based Processors
Table 3 Comparison of Am2901/Am2901 and Am2909/Am2910 Chips
Data/Memory |
||
Am2901 |
Am2903 |
|
Technology |
Low-power Schottky |
Low-power Schottky |
Minimum clock period |
105 ns |
80 ns |
Organization |
4-bit cascadable slice |
4-bit cascadable slice |
Pins |
40 |
48 |
Microinstruction field length |
9 |
11 |
Number of working registers |
16 |
16 |
Data-types supported |
Boolean |
Boolean 2's complement integer |
Operators |
3 arithmetic Add |
7 arithmetic Add Add carry (4) |
5 logic OR |
9 logic OR |
|
Logic shifts |
Logic shifts Increment by 1 or 2 |
|
Status |
Overflow |
Overflow Zero Carry-out |
Control |
||
Am2909 |
Am2910 |
|
Technology |
Low-power Schottky |
Low-power Schottky |
Typical delay |
55 ns |
35 ns |
Organization |
4-bit cascadable slice |
12-bit, noncascadable |
Pins |
28 |
40 |
Address sources |
External |
External |
4-deep stack |
5-deep stack |
|
Microprogram counter |
Microprogram counter |
|
Register |
Register |
|
Number of instructions |
24 |
16 |