15
ID PROM
Every IP contains an IP PROM, whose size is at least 32 x 8 bits. The ID PROM aids in
software auto configuration and configuration management. The user's software, or a
supplied driver, may verify that the device it expects is actually installed at the location it
expects, and is nominally functional. The ID PROM contains the manufacturing revision
level of the IP. If a driver requires that a particular revision be present, it may check for it
directly.
Standard data in the ID PROM on the IP-OCTAL-422 is shown in Figure 7 below.
For more information on IP ID PROMs refer to the IndustryPack Logic Interface
Specification, available from SBS.
The location of the ID PROM in the host's address space is dependent on which carrier is
used. Normally for VMEbus carriers the ID PROM space is directly above the IP's I/O
space, or at IP-base + $80. Macintosh drivers use the ID PROM automatically. RM1260
address may be derived from Figure 7 below by multiplying the addresses given by two,
then subtracting one. RM1270 addresses may be derived by multiplying the addresses
given by two, then adding one.
The ID PROM used is an AMD 27LS19A or equivalent.
3F
(available for user)
19
17
CRC
15
No of bytes used
(0B)
13
Driver ID, high byte
11
Driver ID, low byte
0F
reserved
(00)
0D
Revision
(A1)
0B
Model No IP-OCTAL-422
(2A)
09
Manufacturer ID SBS
(F0)
07
ASCII
"C"
(43)
05
ASCII
"A"
(41)
03
ASCII
"P"
(50)
01
ASCII
"I"
(49)
Figure 7 ID PROM Data (hex)
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