PACE1750A Datasheet, PDF (12/24 Pages) Pyramid Semiconductor Corporation – SINGLE CHIP, 15MHz to 40MHz, CMOS 16-BIT PROCESSOR

PACE1750A
SIGNAL DESCRIPTIONS
CLOCKS AND EXTERNAL REQUESTS
Mnemonic
Name
CPU CLK
CPU clock
TIMER CLK
Timer clock
RESET
CON REQ
Reset
Console request
Description
A single phase input clock signal (0-40 MHz, 40 percent to 60 percent duty
cycle.
A 100 KHz input that, after synchronization with CPU CLK, provides the
clock for timer A and timer B. If timers are used, the CPU CLK signal
frequency must be > 300 KHz.
An active LOW input that initializes the device.
An active LOW input that initiates console operations after completion of
the current instruction.
INTERRUPT INPUTS
Mnemonic
Name
PWRDN INT
Power down interrupt
USR₀INT -
USR₅INT
User interrupt
Description
An interrupt request input that cannot be masked or disabled. This signal
is active on the positive going edge or the high level, according to the
interrupt mode bit in the configuration register.
Interrupt request input signals that are active on the positive going edge
or the high level, according to the interrupt mode bit in the configuration
register.
IOL₁INT -
IOL₂INT
I/O level interrupts
Active HIGH interrupt request inputs that can be used to expand the
number of user interrupts.
FAULTS
Mnemonic
MEM PRT ER
MEM PAR ER
EXT ADR ER
SYSFLT₀
SYSFLT₁
Name
Description
Memory protect error
An active LOW input generated by the MMU or BPU, or both and sampled
by the BUS BUSY signal into the Fault Register (bit 0 CPU bus cycle, bit
1 if non-CPU bus cycle).
Memory parity error
An active LOW input sampled by the BUS BUSY signal into bit 2 of the fault
register.
External address error An active LOW input sampled by the BUS BUSY signal into the Fault
register (bit 5 or 8), depending on the cycle (memory or I/O).
System fault ₀,
System fault ₁,
Asynchronous, positive edge-sensitive inputs that set bit 7 (SYSFLT₀)
or bits 13 and 15 (SYSFLT₁) in the Fault register.
ERROR CONTROL
Mnemonic
Name
UNRCV ER
Unrecoverable error
MAJ ER
Major error
Description
An active HIGH output that indicates the occurrence of an error classified
as unrecoverable.
An active HIGH output that indicates the occurrence of an error classified
as major.
Document # MICRO-3 Rev. C
Page 12 of 24