Reference Manual
Turbo PMAC/PMAC2 Software Reference
Turbo PMAC Global I-Variables 167
I4926 – I4941 MACRO IC Card Identification
Range: $000000000 – $FFFFFFFFF
Units: none (individual bits)
Default: --
I4926 – I4941 are read-only status I-variables that report configuration information for UMAC accessory
boards that contain MACRO ICs, such as the Acc-5E. Which of these ICs is assigned as MACRO IC 0,
1, 2, or 3 for firmware support issues is dependent on the settings of I20, I21, I22, and I23, respectively.
The following table shows which variable corresponds to which card:
Ident I-var
I4902 Bit #
Board DIP Switch
4,3,2,1 Setting
1
Board Base
Address
Board Ident. Info
Address
2
I4926
0
0000 (0)
$078400
$078F10
I4927
1
0001 (1)
$079400
$079F10
I4928
2
0010 (2)
$07A400
$07AF10
I4929
3
0011 (3)
$07B400
$07BF10
I4930
4
0100 (4)
$078500
$078F14
I4931
5
0101 (5)
$079500
$079F14
I4932
6
0110 (6)
$07A500
$07AF14
I4933
7
0111 (7)
$07B500
$07BF14
I4934
8
1000 (8)
$078600
$078F18
I4935
9
1001 (9)
$079600
$079F18
I4936
10
1010 (10)
$07A600
$07AF18
I4937
11
1011 (11)
$07B600
$07BF18
I4938
12
1100 (12)
$078700
$078F1C
I4939
13
1101 (13)
$079700
$079F1C
I4940
14
1110 (14)
$07A700
$07AF1C
I4941
15
1111 (15)
$07B700
$07BF1C
Notes:
1. Board DIP-switches SW1-1 to SW1-4 are currently used to set the addresses of the boards
on the UBUS backplane. A 0 is ON (Closed); a 1 is OFF (Open). The E1 jumper on the
back of the Acc-Ux UBUS backplane board must be ON to use the DIP-switch addressing.
SW1-5 and SW1-6 must be ON (Closed).
2. For diagnostic purposes only. The four Y registers starting at this address contain the
information used to assemble this I-variable.
I4926 to I4941 have multiple fields of information, which can be reported individually or in groups,
depending on the setting of I39. The following table shows what each field reports.
Information
Reported when:
Bits when I39=0
Bits when I39>0
Vendor ID
I39 = 0 or 1
0 – 7
0 – 7
Options
I39 = 0 or 2
8 – 17
0 – 9
Revision #
I39 = 0 or 3
18 – 21
0 – 3
Card ID
I39 = 0 or 4
22 – 35
0 – 13
Base Address
I39 = 5
--
0 - 18
The Vendor ID field is an 8-bit value that reports the manufacturer of the board. Delta Tau boards
report a value of 1 in this field.
Typically, the Options field is a 10-bit field that is used as a set of individual bits to report which
options are present on the board. The meaning of each bit is board-dependent.
The Revision Number field is a 4-bit value that represents the design revision (0 to 15) of the board.
For Delta Tau boards, this value matches the x in the –10x part number suffix for the board.
The Card ID field is a 14-bit value that represents the part number of the board. For Delta Tau
boards, this value matches the xxxx in the 60xxxx (decimal) main part number for the board.