IA2910A

Features:

• Pin-Compatible with the AMD® 2910A
• Addresses 4K words of microcode
• Address Sequencing
• Combination Branching
• Fast Cycle Time
• Output Enable controls 3 Branch Address Sources
• 5v Operation
• -40°C to +85°C Operating Temperature
• Available for the life of your product

· Form, Fit, and Function Compatible with the AMD™ Am2910A
· Packaging options available: 40 Pin Plastic or Ceramic DIP, 44 Pin Plastic Leaded Chip Carrier
· Twelve Bits Wide
· Internal Loop Counter
· Four Address Sources
- push/pop stack counter
- internal holding register
- microprogram counter
- branch address bus
· 9 Word Deep Stack Register
- push/pop control for nesting subroutines
· 16 Sequence Control Microinstructions
· Output Enable controls 3 Branch Address Sources




Pinout






Specifications

PARAMETER	Min	Max	UNITS	Notes
Supply voltage, VDD	TBD		V
Input voltage, VIN	TBD		V
Input Pin Current IIN	TBD		mA
Operating temperature range	TBD
Storage temperature range	TBD
Ambient Temperature, Ta	TBD
Lead Temperature	TBD
Power Dissipation			mW

Description

The IA2910A is a form, fit and function compatible part to the AMD 2910A microprogram controller. The IA2910A is an address controller which will sequence through a series of microinstructions contained in a ROM or PROM. There are four sources of addresses from which the IA2910A may select. The first is a direct data bus (DIN) input, which is straightforward. The second is an internal address register. This register contains data loaded during a previous microinstruction. The third source is a program counter register, which generally contains the previous address incremented by one. The final source of addresses is a nine word deep stack register which gives the capability to execute nested subroutine linkages. All internal registers of the IA2910A are clocked on the rising edge of the clock input (CLK). An OEn input enables the YOUT output bus to be tri-stated. A block diagram is shown in Figure 1.