Nec Network Controller uPD98502 Manual de usuario Pagina 186

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CHAPTER 3 SYSTEM CONTROLLER
186
Preliminary User’s Manual S15543EJ1V0UM
66-MHz IBUS clock rate
Supports 266-MB/sec (32 bits @66 MHz) bursts on IBUS.
Support endian conversion between memory and IBUS slave I/F
Support endian conversion between SyaAD bus and IBUS master I/F
3.1.4 UART
Universal Asynchronous Receiver/Transmitter
Modem control functions
Even, odd or no parity bit generation
Fully prioritized interrupt control
3.1.5 EEPROM
165/250-kHz clock rate (Depend on CPU clock rate ; 66/100 MHz)
Support only 3.3-V EEPROM (Recommended National Semiconductor’s “NM93C46”)
Support Micro Wire interface for Serial EEPROM
Support auto-load function for two addresses of MAC at system boot
3.1.6 Timer
Two 32-bit loadable general-purpose timers generating interrupt to CPU
3.1.7 Interrupt controller
Generates NMI and INT
All interrupt causing events maskable
3.1.8 DSU (Deadman’s SW Unit)
Deadman’s SW Unit generates cold reset to CPU
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