DP83932B datasheet(50/96 Pages) NSC

50 / 96 page

50 Bus Interface (Continued)

TABLE 5-1 Pin Description

(Continued)

Symbol

Driver

Direction

Description

Type

SHARED-MEMORY ACCESS PINS

MREQ

Memory Request

The system asserts this signal low when it attempts to access the

shared-buffer RAM The on-chip arbiter resolves accesses between the system and the

SONIC-16

Note

Both CS and MREQ must not be asserted concurrently If these signals are

successively asserted there must be at least two bus clocks between the deasserting

edge of the first signal and the asserting edge of the second signal

SMACK

Slave and Memory Acknowledge

SONIC-16 asserts this dual function pin low in

response to either a Chip Select (CS) or a Memory Request (MREQ) when the SONIC-

16’s registers or it’s buffer memory is available for accessing This pin can be used for

enabling bus drivers for dual-bus systems

USER DEFINABLE PINS

USR01

TRI

I O Z

User Define 01

These signals are inputs when SONIC-16 is hardware reset and are

outputs when SONIC-16 is a bus master (HLDA or BGACK) When hard reset (RST)is

low these signals input directly into bits 8 and 9 of the Data Configuration register

(DCR) respectively The levels on these pins are latched on the rising edge of RST

During busmaster operations (HLDA or BGACK is active) these pins are outputs whose

levels are programmable through bits 11 and 12 of the DCR respectively The USR01

pins should be pulled up to VCC or pulled down to ground A 47 kX pull-up resistor is

recommended

POWER AND GROUND PINS

VCC1 – 5

Power

The a5V power supply for the digital portions of the SONIC-16

TXVCC

Power

These pins are the a5V power supply for the SONIC-16 ENDEC unit These

pins must be tied to VCC even if the internal ENDEC is not used

RXVCC

PLLVCC

VCCL

GND1 – 6

Ground

The ground reference for the digital portions of the SONIC-16

TXGND

Ground

These pins are the ground references for the SONIC-16 ENDEC unit These

pins must be tied to ground even if the internal ENDEC is not used

ANGND

GNDL

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