TL16PNP100A

STANDALONE PLUG-AND-PLAY (PnP) CONTROLLER

SLLS200C – MARCH 1995 – REVISED SEPTEMBER 1997

9

POST OFFICE BOX 655303

APPLICATION INFORMATION

32-byte I/O block size

The TL16PNP100A supports I/O block sizes ranging from 1 to 16 bytes. The following is one method to enable

this device to support 32-byte I/O block size.

to 32.

Figure 3:

A4 (from ISA Bus)

EEPROM (from TL16PNP100A)

to A4 of TL16PNP100A

Figure 3. 32-Byte I/O Support

This operation forces A4 to 0 after completing the confirguration process (EEPROM signal is pulled up internally

and goes high after the configuration process is complete.) When the address on the ISA bus is in the next 16

I/O addresses, only A4 changes from 0 to 1. Since A4 is being forced to 0, the TL16PNP100A thinks that the

address is still in the 16-byte range and it asserts CS.

Example:

Using logical device 0:

I/O Port Descriptor 1

db

047h

; Small item, type I/O port descriptor

db

000h

; Information, [0] = 0, 10 bit decode

db

020h

; Minimum base address [7:0]

db

002h

; Minimum base address [15:8]

db

0e0h

; Maximum base address [7:0]

db

003h

; Maximum base address [15:8]

db

020h

; Base address increment = 32

db

020h

; Number of ports required = 32