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NM95MS16

Plug and Play Front-End Devices for ISA-BUS Systems

Fairchild Semiconductor 

INTRODUCTION (Continued)

FUNCTION MODULE

SCSI/MODEM/ETHERNET

CONTROLLERS

IRQIN0 2

IRQIN1

DRQIN

DACKOUT* 2 IOCS[0:1]

NM95MS16

2

(DMA Mode)

RSTDRV

OSC

SA[0:11] 12 SD[0:7] 8

IORD*

IOWR* 3

AEN

IRQOUT

[0:5] 6

EEPROM

DRQ

[0:1] 2

DACK

[0:1] 2

CS,SK,DI

3

DO

ISA BUS

FIGURE 1.

Extended Interrupt Mode

In the Ext.Int. mode, support is provided for:

1. Two on-board interrupt request lines switchable to any eight IRQ lines on the ISA bus.

2. Three programmable I/O chip selects for on-board logic.

3. ISA address SA12–SA15 are also included for extended decode.

Figure 2 shows a Block Diagram of NM95MS16 configured for Extended Interrupt Mode.

DS012601-7

IRQIN0 1

FUNCTION MODULE

SERIAL I/O /MULTI-MEDIA

CONTROLLERS

4 IOCS[0:2]

NM95MS16

2

(Extended Interrupt Mode)

RSTDRV

OSC

SA[0:15] 16 SD[0:7] 8

IORD*

IOWR* 3

AEN

IRQOUT

[0:7] 8

ISA BUS

FIGURE 2.

EEPROM

CS,SK,DI

3

DO

DS012601-8

Chipselect Generation

Individual I/O chipselect can be generated in the following two

ways:

A) Address Decode only

B) Address Decode qualified by Command (IORD*, IOWR*).

On-Chip EEPROM

NM95MS16 has 6 kbits of EEPROM on chip. All the PnP resource

data structure for the logical device is stored in this EEPROM. Of

the 6 kbits, 4 kbits are available for the logical device’s external

usage. The logical device can access the EEPROM through a

microwire port, which is essentially a 4-wire serial bus. The pins

CS, SK, DI and DO follow the exact timing as the standard

microwire bus and are compatible to the NM93Cxx family of

EEPROMs.

7

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