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3.2.3 Module Identification
The M220 supports the identification function called IDENT. This IDENT function provides
information about the module and is stored in a sixteen-word deep (32 byte) serial PROM.
Access is accomplished with read/write operations on the last address in IOSpace (hex FE) and
the data is read one bit at a time. The PROM is compatible with a standard IC 9603 type PROM.
For specific timing information refer to the 9603 or compatible PROM data sheet. Data should
not be written to the PROM.
The module also supports the VXI-IDENT function. This function is not part of the approved
ANSI/VITA 12-1996 standard. This extension to the M-module IDENT function increases the
size of the PROM to 64 words and includes VXI compatible ID and Device Type Registers.
Details are shown in Table III.
Table III. M/MA Module PROM IDENT Words
Word Description Value (hex)
0 Sync Code 5346
1 Module Number 0688
2 Revision Number
1
0002
3 Module Characteristics
2
0868
4-7 Reserved 0000
8-15 M-Module Specific 0000
16 VXI Sync Code ACBA
17 VXI ID 0FFF
3
18 VXI Device Type
3
F25D (M220)
19-31 Reserved 0000
32-63 M-Module Specific 0000
Notes:
1) A Revision Number greater than 1 indicates that the module was manufactured by C&H Technologies.
2) The Module Characteristics bit definitions are:
Bit(s) Description
15 0 = no burst access
14/13 unused
12 0 = does not need

12V
11 1 = needs +5V
10 0 = no trigger outputs
9 0 = no trigger inputs
8/7 00 = no DMA requestor
6/5 11 = interrupt type
4/3 01 = 16-bit data
2/1 00 = 8-bit address
0 0 = no memory access
3) The VXI ID of 0xFFF is the identification value for Hewlett-Packard. C&H has left the ID equal to
this value to allow operation with existing E2272A software drivers. The revision number (see note 1)
can be used to identify the module as manufactured by C&H.
4) The VXI Device Type word contains the following information:
Bit(s) Description
15-12 F
16
= 256 bytes of required memory
11-0 25D
16
= C&H specified VXI model code for M220
C&H Technologies, Inc. <> 445 Round Rock West Drive <> Round Rock, Texas 78681 <> www.chtech.com