Digital Core Design

DP8051CPU

Pipelined High Performance Microcontroller

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Family Summary
Performance
Info
Pins description
Block diagram
Units

The DP8051CPU is an ultra high performance, speed optimized soft core, of a single-chip 8-bit embedded controller, intended to operate with fast (typically on-chip) and slow (off-chip) memories. The core has been designed with a special concern about performance to power consumption ratio. This ratio is extended by an advanced power management PMU unit.
The DP8051CPU soft core is 100% binary-compatible with the industry standard 8051 8-bit microcontroller. There are two configurations of DP8051CPU: Harvard, where internal data and program buses are separated and von Neumann, with common program and external data bus. The DP8051CPU has a Pipelined RISC architecture and executes 120-300 million instructions per second. Dhrystone 2.1 benchmark program runs from 11.46 to 15.55 times faster, than the original 80C51 at the same frequency. The same C compiler was used for benchmarking of the core vs 80C51 with the same settings. This performance can also be exploited to great advantage in low power applications, where the core can be clocked over ten times more slower than the original implementation, without performance depletion.
The DP8051CPU is delivered with fully automated testbench and complete set of tests, allowing easy package validation, at each stage of SoC design flow.

Each of the DCD's 8051 Core has built-in support for DCD Hardware Debug System, called DoCD^TM. It is a real-time hardware debugger, which provides debugging capability of a whole System on Chip (SoC).
Unlike other on-chip debuggers, the DoCDTM provides non-intrusive debugging of running application. It can halt, run, step into or skip an instruction, read/write any contents of microcontroller, including all registers, internal and external program memories and all SFRs, including user defined peripherals. More details about DCD on Chip Debugger

Family summary

Design	Dhry speed	on-chip CODE RAM/ROM	off-chip CODE	CODE write	IDATA space	XDATA space	XDATA, CODE wait states	DoCD^TM	PMU	Interrupt sources	DPTR	Timers	UART	IO Ports	Compare/ Capture	Watchdog	MDU MDU32	DI2CM	DI2CS	DSPI	DFPMU	DMAC	DCAN
DQ80251	56.8	8M	8M	+	1k-32k	8M	+	+	+	5	1	2	1	4	-	-	-	-	-	-	-	-	-
DQ8051CPU	25.13	64k/64k	64k/8M	+	256	16M	+	+	+	2	1	-	-	-	-	-	-	-	-	-	-	-	-
DQ8051	25.13	64k/64k	64k/8M	+	256	16M	+	+	+	5	1	2	1	4	-	-	-	-	-	-	-	-	-
DQ8051XP	26.62	64k/64k	64k/8M	+	256	16M	+	+	+	15	2	3	2	4	+	+	+	+	+	+	+	+	+
DP8051CPU	15.55	64k/64k	64k/8M	+	256	16M	+	+	+	2	1	-	-	-	-	-	-	-	-	-	-	-	-
DP8051	15.55	64k/64k	64k/8M	+	256	16M	+	+	+	5	1	2	1	4	-	-	-	-	-	-	-	-	-
DP8051XP	15.55	64k/64k	64k/8M	+	256	16M	+	+	+	15	2	3	2	4	+	+	+	+	+	+	+	+	+
DP80C51	11.4	64k/64k	64k	+	256	64k	+	+	+	5	1	2	1	4	-	-	-	-	-	-	-	-	-
DT8051	8.1	64k/64k	64k	+	256	64k	-	+	+	11	1	2	1	1	-	-	-	-	-	-	-	-	-

The main features of each DCD's DQ8051, DQ80251, DP8051, DP80C51, DT8051 family member have been summarized in the table above. It gives a brief member characteristic, helping you to select the most suitable IP Core for your application. You can specify your own peripheral set (including listed above and the others) and request the core modifications.

Performance

Each core has been tested in variety of FPGA and ASIC technologies. Its implementation's results are summarized below.

Implementation	Speed grade	Utilized Area [gates]	Frequency [MHz]
0.25u area	typical	6 050	100
0.25u speed	typical	7 600	250
0.18u area	typical	5 730	100
0.18u speed	typical	6 900	300

DP8051CPU implementation results for ASIC devices - results given for working system, with connected IDATA, CODE and XDATA memories. The CPU features and Peripherals have been included. DoCD JTAG debugger increases core size by approximately 2 100 gates.

Implementation	Speed grade	Utilized Area	Frequency [MHz]
SPARTAN-IIE	-7	860 Slices	64
SPARTAN-III	-5	860 Slices	77
VIRTEX-II	-6	860 Slices	106
VIRTEX-II pro	-7	860 Slices	129
VIRTEX-4	-11	860 Slices	107
VIRTEX-5	-3	1320 LCells	200

CPU Features

software is 100% compatible with 8051 industry standard
Pipelined RISC architecture enables to run 15.55 times faster, than the original 80C51 at the same frequency
Up to 16,632 VAX MIPS at 100 MHz
24 times faster multiplication
12 times faster division
Up to 256 bytes of internal (on-chip) Data Memory
Up to 64 kB of internal (on-chip) or external (off-chip) Program Memory
Up to 16 MB of external (off-chip) Data Memory
User programmable Program Memory Wait States
User programmable External Data Memory Wait States
De-multiplexed Address/Data bus to allow easy memory connection
Interface for additional Special Function Registers
Fully synthesizable
Static synchronous design
Positive edge clocking and no internal tri-states
Scan test ready

Symbol

clk

rst

iprgramsize (2:0)

iprgromsize (2:0)

int0

int1

sfrdatai (7:0)

sfrdatao (7:0)

sfrwe

sfroe

sfraddr (6:0)

prgramdata (7:0)

prgromdata (7:0)

prgaddr (15:0)

prgdatao (7:0)

prgramwr

xdatai (7:0)

ready

xdatao (7:0)

xdataz

xaddr (23:0)

xprgrd

xprgwr

xdatard

xdatawr

stop

pmm

ramdatai (7:0)

ramdatao (7:0)

ramaddr (7:0)

ramoe

ramwe

tdi

tck

tms

tdo

rtck

sxdmdatai (7:0)

sxdmaddr (15:0)

sxdmdatao (7:0)

sxdmoe

sxdmwe

Pins description

Pin	Type	Description
clk	input	Global clock
rst	input	Global reset
iprgramsize (2:0)	input	Size of on-chip RAM CODE
iprgromsize (2:0)	input	Size of on-chip ROM CODE
int0	input	External interrupt 0
int1	input	External interrupt 1
sfrdatai (7:0)	input	Data bus from user SFRs
prgramdata (7:0)	input	Data bus from internal RAM program memory
prgromdata (7:0)	input	Data bus from internal ROM program memory
xdatai (7:0)	input	Data bus from external memories
ready	input	External memory data ready
ramdatai (7:0)	input	Data bus from internal data memory
tdi	input	DoCD^TM TAP data input
tck	input	DoCD^TM TAP clock line
tms	input	DoCD^TM TAP mode select
sxdmdatai (7:0)	input	Data bus from sync external data memory (SXDM)
sfrdatao (7:0)	output	Data bus for user SFRs
sfrwe	output	User SFRs write enable
sfroe	output	User SFRs read
sfraddr (6:0)	output	User SFRs address bus
prgaddr (15:0)	output	Internal program memory address bus
prgdatao (7:0)	output	Data bus for internal program memory
prgramwr	output	Internal program memory write
xdatao (7:0)	output	Data bus for external memories
xdataz	output	Turn xdata bus into "Z" state
xaddr (23:0)	output	Address bus for external memories
xprgrd	output	External program memory read
xprgwr	output	External program memory write
xdatard	output	External data memory read
xdatawr	output	External data memory write
stop	output	Stop mode indicator
pmm	output	Power management mode indicator
ramdatao (7:0)	output	Data bus for internal data memory
ramaddr (7:0)	output	RAM address bus
ramoe	output	Internal data memory read
ramwe	output	Internal data memory write enable
tdo	output	DoCD^TM TAP data output
rtck	output	DoCD^TM return clock
sxdmaddr (15:0)	output	Sync XDATA memory address bus (SXDM)
sxdmdatao (7:0)	output	Data bus for Sync XDATA memory (SXDM)
sxdmoe	output	Sync XDATA memory read (SXDM)
sxdmwe	output	Sync XDATA memory write (SXDM)

Block Diagram

Opcode DecoderPerforms an opcode decoding instruction and control functions for all other blocks.

Control UnitIt performs the core synchronization and data flow control. This module is directly connected to Opcode Decoder and it manages execution of all microcontroller tasks.

iprgramsize (2:0)

iprgromsize (2:0)

ALUArithmetic Logic Unit - performs the arithmetic and logic operations, during execution of an instruction. It contains accumulator (ACC), Program Status Word (PSW), (B) registers and related logic, like arithmetic unit, logic unit, multiplier and divider.

Interrupt ControllerInterrupt Controller module is responsible for the interrupt manage system of the external and internal interrupt sources. It contains interrupt related registers, such as Interrupt Enable (IE), Interrupt Priority (IP) and (TCON) registers.

int0

int1

SFRs InterfaceSpecial Function Registers interface - controls access to externally connected peripherals, through SFR bus.

sfrdatai (7:0)

sfrdatao (7:0)

sfrwe

sfroe

sfraddr (6:0)

Program Memory InterfaceProgram Memory Interface contains Program Counter (PC) and related logic. It performs the instructions code fetching. Program Memory can be also written. This feature allows usage of a small boot loader, to load new program into ROM, RAM, EPROM or FLASH EEPROM storage via UART, SPI, I2C or DoCD module.

prgramdata (7:0)

prgromdata (7:0)

prgaddr (15:0)

prgdatao (7:0)

prgramwr

External Memory InterfaceContains memory access related registers, such as Data Page High (DPH), Data Page Low (DPL) and Data Page Pointer (DPP) registers. It performs the external Program and Data Memory addressing and data transfers. Program fetch cycle length can be programmed by the user. This feature is called Program Memory Wait States and it allows core, to work with different speed program memories.

xdatai (7:0)

xdatao (7:0)

xdataz

xaddr (23:0)

ready

xprgrd

xprgwr

xdatard

xdatawr

Power Management UnitPower Management Unit contains advanced power saving mechanisms with switchback feature, allowing external clock control logic to stop clocking (Stop mode) or run core in lower clock frequency (Power Management Mode), to significantly reduce power consumption. Switchback feature allows UARTs and interrupts to be processed in full speed mode, if enabled. It is highly desirable, when microcontroller is planned to be used in portable and power critical applications.

stop

pmm

Internal Data Memory InterfaceInterface controls access into the internal memory of size up to 256 bytes. It contains 8-bit Stack Pointer (SP) register and related logic.

ramdatao (7:0)

ramaddr (7:0)

ramdatai (7:0)

ramoe

ramwe

DoCD^TM JTAG DoCD^TM Debug Unit is a real-time hardware debugger, which provides debugging capability of a whole SoC system. Unlike other on-chip debuggers, DoCD^TM ensures non-intrusive debugging of running application. It can halt, run, step into or skip an instruction, read/write any contents of microcontroller, including all registers, internal and external program memories and all SFRs, including user defined peripherals. Hardware breakpoints can be set and controlled on program memory, internal and external data memories, as well as on SFRs. Hardware watchpoints can be set and controlled on internal and external data memories and also on SFRs. Hardware watchpoints are executed, if any write/read occurs at particular address, with certain data pattern or without pattern. Two additional pins: CODERUN and DEBUGACS, indicate the state of the debugger and CPU. CODERUN is active, when CPU is executing an instruction. DEBUGACS pin is active, when any access is performed by DoCD^TM debugger. The DoCD^TM system includes JTAG interface and complete set of tools, to communicate and work with core in real time debugging. It is built, as a scalable unit and some features can be turned off, to save silicon and reduce power consumption. When debugger is not used, it is automatically switched to power save mode. Finally, when debug option is no longer used, whole debugger is turned off.

tdi

tck

tms

tdo

rtck

SXDM interfaceSynchronous eXternal Data Memory (SXDM) Interface contains XDATA memory access related logic, allowing fast access to synchronous memory devices. It performs the external Data Memory addressing and data transfers. This memory can be used to store large variables, frequently accessed by CPU, improving overall performance of application.

sxdmdatai (7:0)

sxdmaddr (15:0)

sxdmdatao (7:0)

sxdmoe

sxdmwe

clk

rst

Internal data bus 8-bit internal data bus

SFR data bus 8-bit Special Function Registers bus is used to inter-communication of all processors" peripherals. It allows easy management of system architecture.

Units

Opcode Decoder

Performs an opcode decoding instruction and control functions for all other blocks.

Control Unit

It performs the core synchronization and data flow control. This module is directly connected to Opcode Decoder and it manages execution of all microcontroller tasks.

ALU

Arithmetic Logic Unit - performs the arithmetic and logic operations, during execution of an instruction. It contains accumulator (ACC), Program Status Word (PSW), (B) registers and related logic, like arithmetic unit, logic unit, multiplier and divider.

Interrupt Controller

Interrupt Controller module is responsible for the interrupt manage system of the external and internal interrupt sources. It contains interrupt related registers, such as Interrupt Enable (IE), Interrupt Priority (IP) and (TCON) registers.

SFRs Interface

Special Function Registers interface - controls access to externally connected peripherals, through SFR bus.

Program Memory Interface

Program Memory Interface contains Program Counter (PC) and related logic. It performs the instructions code fetching. Program Memory can be also written. This feature allows usage of a small boot loader, to load new program into ROM, RAM, EPROM or FLASH EEPROM storage via UART, SPI, I2C or DoCD module.

External Memory Interface

Contains memory access related registers, such as Data Page High (DPH), Data Page Low (DPL) and Data Page Pointer (DPP) registers. It performs the external Program and Data Memory addressing and data transfers. Program fetch cycle length can be programmed by the user. This feature is called Program Memory Wait States and it allows core, to work with different speed program memories.

Power Management Unit

Power Management Unit contains advanced power saving mechanisms with switchback feature, allowing external clock control logic to stop clocking (Stop mode) or run core in lower clock frequency (Power Management Mode), to significantly reduce power consumption. Switchback feature allows UARTs and interrupts to be processed in full speed mode, if enabled. It is highly desirable, when microcontroller is planned to be used in portable and power critical applications.

Internal Data Memory Interface

Interface controls access into the internal memory of size up to 256 bytes. It contains 8-bit Stack Pointer (SP) register and related logic.

DoCD^TM JTAG

DoCD^TM Debug Unit is a real-time hardware debugger, which provides debugging capability of a whole SoC system. Unlike other on-chip debuggers, DoCD^TM ensures non-intrusive debugging of running application. It can halt, run, step into or skip an instruction, read/write any contents of microcontroller, including all registers, internal and external program memories and all SFRs, including user defined peripherals. Hardware breakpoints can be set and controlled on program memory, internal and external data memories, as well as on SFRs. Hardware watchpoints can be set and controlled on internal and external data memories and also on SFRs. Hardware watchpoints are executed, if any write/read occurs at particular address, with certain data pattern or without pattern. Two additional pins: CODERUN and DEBUGACS, indicate the state of the debugger and CPU. CODERUN is active, when CPU is executing an instruction. DEBUGACS pin is active, when any access is performed by DoCD^TM debugger. The DoCD^TM system includes JTAG interface and complete set of tools, to communicate and work with core in real time debugging. It is built, as a scalable unit and some features can be turned off, to save silicon and reduce power consumption. When debugger is not used, it is automatically switched to power save mode. Finally, when debug option is no longer used, whole debugger is turned off.

SXDM interface

Synchronous eXternal Data Memory (SXDM) Interface contains XDATA memory access related logic, allowing fast access to synchronous memory devices. It performs the external Data Memory addressing and data transfers. This memory can be used to store large variables, frequently accessed by CPU, improving overall performance of application.