NEC DB2000, Service Manual

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Interrupt generation to NELL
I/O: This bit I/O port performs interrupt control of NELL: EXTINT(#73)
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Superchip interrupt and reset inputs
The superchip has the following interrupt and reset inputs:
I/P: DSP INTO (#48) - DSP Interrupt 0
DSPRSTB (#50) - DSP Reset bar
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JTAG test interface
The JTAG interface provides extensive test and diagnostic functions to be
utilised in the repair process. This is controlled by:-
I/O: TCK (#54) - JTAG test clock
TMS (#55) - JTAG test mode select
TDI (#57) - JTAG test data input
TDO (#56) - JTAG test data output
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Supply and ground connections
+3VSC = (#10,21,36,49,62 & 92)
+3VAUDIO = (#2,85,58)
GND = (#11,20,31,42,52,69,76,91 & 61)
AGND1 = (#1)
A functional block diagram of the
A functional block diagram of the Superchip can be seen in Figure 10a. Superchip can be seen in Figure 10a.
6.2 NELL
The NELL device is an in-house designed ASIC (AApplications SSpecific
IIntegrated CCircuit) which has been developed to replace the existing Albert
and CPU devices currently used in G9 and G9D. The NELL performs the
following functions:-
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CPU
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CPU Interface
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Interrupt Controller
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Baseband Power Control
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Keypad Control
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Display Interface
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EEPROM Interface
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SIM Interface
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Buzzer Control
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UART control/interface: (Universal Asynchronous Receiver Transmitter)
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PCMCIA Data Interface: (Personal Computer Memory Card International
Association)