UT1750AR(2003) Ver la hoja de datos (PDF) - Aeroflex UTMC

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UT1750AR
(Rev.:2003)

RadHard RISC Microprocessor

Aeroflex UTMC 

The UT1750AR loads the eight bits of serial data into the lower

eight bits of the TXMT (figure 13).

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

MEM PARITY I/O

PROT

S ILLEGAL R BUILT-

Y

INSTRUC-

TION AND

E

IN-

TEST

F ADD FAULT S

T

MSB

LSB

Figure 15. The Fault Register (FT)

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

TT T TTT TT

D DDDDDD DXX XX XXXX

C C C C C C C C D D D D DD D D

76 5 4 32 10

MSB

DC = Don’t Care

LSB

Figure 13. The UART Transmitter

The Pending Interrupt Register (PI)

The Pending Interrupt Register (PI) contains information on

pending interrupts attempting to vector the Instruction Counter

Register (IC) to a new location. Software or hardware controls

the PI. Any system interrupt, when active, sets the

corresponding bit in the PI. RISC I/O instructions can also set,

clear, and read the PI (figure 14).

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

PM I FFEF T I T I I I I I I

W C N L I X L I N I NNONON

D H T P PC PM TMT T LT LT

N E OOO LU A 1B 2 3 1 4 2 5

MSB

LSB

Figure 14. The Pending Interrupt Register (PI)

The Fault Register (FT)

The UT1750AR uses the Fault Register (FT) (figure 15) to

indicate the occurrence of a machine-error fault. A machine-

error fault cannot be disabled. The UT1750AR uses the logical

OR combination of the 16 FT bits to generate the Machine Error

interrupt, bit 14 of the PI. Any bits in the FT the UT1750AR

does not use are set to a logic zero. The UT1750AR reads, loads,

and clears the FT with RISC I/O instructions. The configuration

of the FT is shown in figure 15.

Bit Definitions

All bits in the Fault Register are active when high.

BIT

NUMBER MNEMONIC

DESCRIPTION

15

CMPF

CPU Memory Protect Fault.

This bit indicates the

UT1750AR has detected an

access fault, write-protect

fault, or an execute-protect

fault. [0]

14

DMPF

DMA Memory Protect Fault.

This bit indicates a DMA

device has detected an access

fault or a write-protect fault.

[0]

13

MPF

Memory Parity Fault. [0]

12

PCPF

Parallel I/O (PIO) Channel

Parity Fault. [0] No user

access.

11

DCPF

DMA Channel Parity Fault.

[0] No user access.

10

ICF

Illegal Command Fault. This

bit indicates an attempt to

execute an unimplemented or

reserved I/O command. [0]

9

PTF

them

PIO Transmission Fault. Can

wire-OR I/O error-checking

devices together and feed

into this input to indicate an

error. [0] No user access.

8

SYSFLT

System Fault. [0]

7

IAF

Illegal Address Fault. This bit

indicates addressing a memory

6

IIF

location not physically

present. [0]

Illegal Instruction Fault. This

bit indicates an attempt to

17

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