ADDR10 datasheet(10/68 Pages) ETC2

10 / 68 page

P i no ut d e tail tabl es

NS 75 20 Da ta shee t

03 /2 00 6

Pinout detail tables

Each pinout table applies to a specific interface and contains the following information:

Notes:

NO CONNECT

as a pin description means do not connect to this pin.

The 177th pin (package ball) is for alignment of the package on the PCB.

System Bus interface

Signal

The pin name for each I/O signal. Some signals have multiple function modes and are identified

accordingly. The mode is configured through firmware using one or more configuration registers.

The pin number assignment for a specific I/O signal.

U next to the pin number indicates that the pin is a pullup resistor.

D next to the pin number indicates that the pin is a pulldown resistor.

No value next to the pin indicates that the pin has neither a pullup nor pulldown resistor.

See Figure 5, "Internal pullup characteristics," on page 24 and Figure 6, "Internal pulldown

characteristics," on page 25 for an illustration of the characteristics of these pins. Use the figures

to select the appropriate value of the complimentary resistor to drive the signal to the opposite

logic state. For those pins with no pullup or pulldown resistor, you must select the appropriate

value per your design requirements.

An underscore (bar) indicates that the pin is active low.

I/O

The type of signal — input, output, or input/output.

The output drive strength of an output buffer. The NS7520 uses one of three drivers:

2 mA

4 mA

8 mA

Symbol

I/O

Description

BCLK

Synchronous bus clock

External bus

Other

External bus

Other

ADDR27

CS0OE_

N10 U

I/O

Addr bit 27

Logical AND of CS0_ and OE_

ADDR26

CS0WE_

P10 U

I/O

Addr bit 26

Logical AND of CS_ and WE_

External bus

ADDR25

M10 U

I/O

Remainder of address bus (through ADDR0)

ADDR24

R10 U

I/O

ADDR23

N9 U

I/O

ADDR22

R9 U

I/O

ADDR21

M9 U

I/O

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