Reference Manual

Turbo PMAC/PMAC2 Software Reference
Turbo PMAC Global I-Variables 168
 The Base Address field is a 19-bit value that represents the starting address of the board in the Turbo
PMAC’s address space.
I4942 – I4949 DPRAM IC Card Identification
Range: $000000000 – $FFFFFFFFF
Units: none (individual bits)
Default: --
I4942 – I4949 are read-only status I-variables that report configuration information for UMAC accessory
boards that contain DPRAM ICs, such as the Acc-54E. The following table shows which variable
corresponds to which card:
Ident I-var
I4904
Bit #
Board DIP Switch
4,3,2,1 Setting
1
Board Base
Address
Board Ident.
Info Address
2
I4942
16
0000 (0) or 0001 (1)
$06C000
$078F20
I4943
17
0010 (2) or 0011 (3)
$074000
$078F24
I4944
18
0100 (4) or 0101 (5)
$06D000
$079F20
I4945
19
0110 (6) or 0011 (7)
$075000
$079F24
I4946
20
1000 (8) or 1001 (9)
$06E000
$07AF20
I4947
21
1010 (10) or 1011 (11)
$076000
$07AF24
I4948
22
1100 (12) or 1101 (13)
$06F000
$07BF20
I4949
23
1110 (14) or 1011 (15)
$077000
$07BF24
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.
I4942 to I4949 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.
 The Options field is a 10-bit field that is typically 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.
 The Base Address field is a 19-bit value that represents the starting address of the board in the Turbo
PMAC’s address space.