Kontron VMOD-2D Manual do Utilizador descarregar pdf (Página 29)

VMOD-2/VMOD-2D

12/15/97

Functional Description

Page 2 - 3Man. ID 03139, Rev. Index 0200

Addressing piggyback (i.e. PB-REL) fitted in location A (the upper position on VMOD-2)

• VMOD-2 BASE ADDRESS+$41= PB-REL's ID Vector (read only)

• VMOD-2 BASE ADDRESS+$01= PB-REL's 8-bit output port Register

(read/write)

Addressing piggyback (i.e. PB-REL) fitted in location B (the lower position on VMOD-2)

• VMOD-2 BASE ADDRESS+$C1/$1041* = PB-REL's ID Vector (read

only)

• VMOD-2 BASE ADDRESS+$81/$1001* = PB-REL's 8-bit output port

* Actual offset for lower piggyback is subject to the setting of jumper B16 and could be $10xx

if a 5230-xx piggyback is fitted into the upper piggyback location, and jumper B16 is set. I.e. 8

KByte address width is required.

A jumper set results in the related address line being assigned a logical low (0) function.

2.1.1Selection of Address Block Widths

As mentioned in the preceding section, an important aspect regarding the use of the VMOD-2

is the option of block size selection, which must be taken into consideration when using the

VMOD-2 in certain configurations and/or applications.

When using the VMOD-2 to replace an existing VMOD (as a one-to-one direct replacement),

the VMOD-2 should be set to the narrower address range of 256 Bytes by opening the jumper

B16. This ensures that the VMOD-2 presents an address width of only 256 Bytes identical to

the old VMOD, and uses offsets of $01 and $80 for the two piggyback locations.

No new "5230-xx" piggybacks should be added to the VMOD-2 when used as a replacement

for an older VMOD since when jumper B16 is open the enhanced (5230-xx) piggybacks will

not have the use of additional address lines A7...A11 and will not therefore function correctly.

Where using existing piggybacks and a VMOD-2 to substitute an older style VMOD, we rec-

Table 2-1: Default Setting of the VMOD-2 Base Address

Configuration for base address range $FE2400 to $FE24FF

VMOD-2 Jumpers B02 B12 B13 B14 B15 B16 Base Address

Default Settings Set Set Open Set Set Open $FE2400

Address Lines A15 A14 A13 A12 A11 in

256

Byte

block

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 81 82

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