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GTXI User's Guide
an A5EN switch, there is a limit of 32 internal addresses for
one board. The GT7021 has an A5EN switch.
In a similar manner, A10EN, A11EN, and A12EN have the
same meaning for more offset address choices.
Enabling switch
Offset address
increments
A10EN 0x400H
A11EN 0x800H
A12EN 0x1000H
Table 3-10: A10EN through A12EN offset addresses
For example, a board uses the addresses 300H, 301H, 700H,
and 701H. Since the last two addresses are over 400H, in order
to be able to code 700H–701H, A10EN must be set to OFF.
The default settings for the address masks are:
A4EN
ON
Board uses 16 consecutive addresses.
A10EN OFF
A11EN
OFF
Offset address increments of 1000H.
A12EN ON
Table 3-11: A4EN through A12EN Default Settings
These steps are given in greater detail in the sections that follow,
along with three examples.
Example 1: Short base address range and zero offset
This example uses a base address range of 300H-307H and offset
address of zero.
1. Set the base address.
The base address of 300H in binary becomes 11,0000,0000.
This translates in settings of (remember that A0-A3 are
ignored):
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