CHAPTER 2 PIN FUNCTION
PRELIMINARY
NEC confidential and Proprietary
26
2.2.3 Management
Interface
The management interface is used to access the registers of the
µ
PD98413.
Pin Name
Serial No.
Address No.
I/O Level
Function
MCLK
I
LVTTL
Microprocessor bus Clock
This pin Input microprocessor bus Clock.
All read and write operations in the Management interface are
executed in synchronization with this clock signal.
AD31-0
I/O
LVTTL
Address / data bus
The AD31 to AD0 bus is a 32-bit, bi-directional,
multiplexed address/data bus. During the first clock of a
transaction, AD31 to AD0 contains a physical byte
address. During subsequent clocks, AD31 to AD0 contains
data. When the
µ
PD98413 is not accessing the bus, it
places the AD bus in the high impedance state.
CS_B
I
LVTTL
I/O chip select signal
When this signal is low, access to the internal registers of
the
µ
PD98413 is enabled.
UWE_B
I
LVTTL
Upper word enable signal
R/W_B
I
LVTTL
Read / write select signal
RDY_B
O
3-state
LVTTL
Ready signal
INT_B
O
LVTTL
Interrupt Output
The INT_B output is used to inform the CPU that an
(unmasked) interrupt bit was set in the INT.
Summary of Contents for UPD98413
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