Numark D2 DIRECTOR Service Manual page 5

SHEET 1 – CPU
This sheet shows the system CPU and associated circuitry. IC4 is a Cirrus EP9307 ARM CPU. The
IC runs from a 1.8V core supply (VCCCORE) and a 3.3V I/O supply (VCCIO).
IC2 is a 64Mbit flash memory for program and data storage. IC1 and IC3 are SDRAM memory,
these run at 100MHz clock speed.
IC6 is a reset generator that monitors both the core and I/O supply rails and keeps the CPU in reset
until both supplies are stable.
IC14 is a 14.7456MHz oscillator module. This clock is used by the CPU IC which features several
internal phase locked loops to generate the various clocks required; the 100MHz SDRAM clock for
example.
IC5 is a real time clock (RTC) IC that provides a 32kHz clock used by the ARM CPU. Note that we
do not currently make use of the RTC function, it is there only to provide the 32kHz clock for the
CPU. This is an important clock and the CPU will not boot without it.
Provision has been made to use a back up battery for the RTC. Were this to be used, it would
connect to PL10 to provide power for the RTC only when the main power supply is switched off.
The resistors in the lower left corner of this sheet (R31, R33-34, R36, R39, R41, R43-44), are
important configuration resistors, these ensure that the CPU boots in the correct mode.
GPIOs and interrupts
Signals GPIO0-14 are general purpose I/O signals that are used to control a variety of functions as
described in the table below.
GPIO
GPIO0
GPIO1
GPIO2 Input
GPIO3 Output
GPIO4 Input
GPIO5 Input
GPIO6 Output
GPIO7 Output
GPIO8 Input
GPIO9 Input
GPIO10 Input
GPIO11 Output
GPIO12
GPIO13 Output
GPIO14 Output
INT0 Interrupt input
Input/Output
USB power fault. 1=Normal. 0=USB power fault
USB power enable. 0=power enabled. 1=Disabled
!OFF power down request signal from I/O board.
Normally high. Low to request power down.
POWER. State of front panel power switch. High when
button is pressed
!DAC_RESET. Normally high. Low to reset audio DAC
!ADC_RESET. Normally high. Low to reset audio ADC
FSTART_A. Fader start. Used in KA3 but not NH00.
FSTART_B. Fader start. Used in KA3 but not NH00.
JUKEBOX_MODE. Used in KA3 but not NH00.
Controls USB switch IC8 for iPod interface. 1=iPod in
USB mode. 0= iPod in serial mode. (Not used in NH00)
Not used
DSP SPIDS. Normally high. Low when programming
software into DSP.
!DSP_RESET. Normally high. Low to reset Sharc DSP
POWERFAIL. Normally low. High to indicate power
failure (i.e power has been removed)
Function