www.aldec.com ©2006 Aldec, Inc. All rights reserved
ALDEC 8051 IP Core Data Sheet
April 11, 2006 (version 1.0)



The 8051 core is the HDL model of the Intel™ 8-bit 8051 micro controller. The model is fully
compatible with the Intel 8051 standard.
Overview


x Opcode and Cycle Equivalent to Intel standard 8051
x Support for Intel Hex file format
x Up to 4K Bytes Internal Program Memory (ROM)
x Up to 128 Bytes Internal Data Memory (RAM)
x Up to 64K Bytes External Program Memory address space
x Up to 64K Bytes External Data Memory address space
x Up to 128 Special Function Registers (SFR)
x 32 bi-directional and individually addressable I/O Lines
x Two 16-bit timer/counters
x Full Duplex UART (Serial Port)
x 6-Source/5-Vector Interrupt Structure with Two Priority Levels
Features


Table 1: Core Signal Pinout

Notes:
1) XTAL1 and XTAL2 original device pins were replaced with one CLK (clock) input
signal. The clock frequency value has no limitations during the functional simulation.
2) EA, RST, ALE and PSEN signals behave exactly the same as the original device and
are compatible with the Intel 8051 standard.
3) In the synthesizable model, each bidirectional pin is defined in the core interface as
two separated VHDL ports. Optionally, using the Aldec VHDL/Verilog Interface, it can
be merged to one bidirectional VHDL port. The behavioral model has bidirectional
ports.


Name Direction Polarity Description
CLK 1) Input - Clock input
EA 2) Input Low External Access
RST 2) Input High Synchronous reset
ALE 2) Output High Address Latch Enable
PSEN 2) Output Low Program Store Enable
P0[7:0] 3) Bidirectional - Port P0
P1[7:0] 3) Bidirectional - Port P1
P2[7:0] 3) Bidirectional - Port P2
P3[7:0] 3) Bidirectional - Port P3
Pinout